2014 Mustang Workshop Manual

SECTION 501-18: Convertible Top	2014 Mustang Workshop Manual
DIAGNOSIS AND TESTING	Procedure revision date: 01/07/2013

Convertible Top

Special Tool(s)
	Flex Probe Kit 105-R025D or equivalent
	Fluke 77-IV Digital Multimeter FLU77-4 or equivalent
	Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Material
Item	Specification
MERCON® V Automatic Transmission Fluid XT-5-QM (or XT-5-QMC) (US); CXT-5-LM12 (Canada)	MERCON® V

Principles of Operation

The convertible top system is controlled by the Body Control Module B (BCM-B). The convertible top will only function when the accessory delay relay is active and vehicle speed is less than 5 km/h (3 mph). When the convertible top switch is activated, the BCM-B commands the front and rear windows to the full DOWN position. The BCM-B will disable/inhibit the rear quarter window control switch from operating the rear quarter windows when the convertible top ajar switch indicates the convertible top is not in the full UP or full DOWN position. When the BCM-B detects that the LH and RH rear window motors are in the full downward position, it will command the appropriate relay to close in order to raise or lower the convertible top. If the BCM-B does not detect a full down signal from the LH and RH rear window motors, the convertible top operation will be disabled.

The convertible top assembly is a floating frame, Z-fold design. The main pivot brackets are attached to the body, and the convertible top frame side rails expand or fold when the convertible top is raised or lowered. The LH and RH stay pads are attached to the convertible top frame bows, and provide the main source of tension for the convertible top material. When the convertible top is in the full DOWN position, it is stored in the compartment behind the rear seat backrest. When the convertible top is in the full UP position, the body provides a stop which the convertible top frame No. 5 bow contacts to provide a weather seal for the convertible top against the body.

The convertible top hydraulic system uses a reversible hydraulic pump and motor assembly. When activated, the hydraulic pump uses hydraulic pressure to extend the hydraulic lift cylinders to raise the convertible top, or retract the hydraulic lift cylinders to lower the convertible top. The hydraulic motor/pump assembly is equipped with a thermal circuit breaker. In the event of a concern, the circuit breaker will reset after approximately 5 minutes. The thermal circuit breaker is integral to the hydraulic motor and pump assembly and cannot be serviced separately. In the event of a hydraulic system failure, the convertible top cannot be operated manually.

Inspection and Verification

Verify the customer concern.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Convertible top brackets and frame Convertible top latches Hydraulic motor and pump assembly Hydraulic lift cylinders Hydraulic lines	Battery Junction Box (BJB) fuse 35 (40A) Body Control Module B (BCM-B) Convertible top ajar switch Convertible top switch Convertible top raise relay Convertible top lower relay Hydraulic motor and pump assembly LH or RH rear power window motor Loose or corroded connections Wiring harness

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM .
If the scan tool does not communicate with the VCM :
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM .
- refer to Section 418-00 , No Power To The Scan Tool, to diagnose no power to the scan tool.

If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to Section 418-00 to diagnose no response from the BCM-B .

Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Section 418-00 .
- If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Clear the CMDTCs and carry out the self-test diagnostics for the BCM-B .

If the DTCs retrieved are related to the concern, go to the Body Control Module B (BCM-B) DTC Chart. For all other DTCs, refer to Section 419-10 .

If no DTCs related to the concern are retrieved, GO to Symptom Chart .

DTC Chart

NOTE: This module utilizes a 5-character DTC followed by a 2-character failure type code. The failure type code provides information about specific fault conditions such as opens or shorts to ground. CMDTCs have an additional 2-character DTC status code suffix to assist in determining DTC history.

Body Control Module B (BCM-B) DTC Chart

DTC	Description	Action
B1267:11	Convertible/Folding Top Activation Up Switch: Circuit Short to Ground	GO to Pinpoint Test A .
B1268:11	Convertible/Folding Top Activation Down Switch: Circuit Short to Ground	GO to Pinpoint Test A .
B1269:11	Convertible/Folding Top Fully Up Position Switch: Circuit Short to Ground	REFER to Section 501-11 .
B126D:15	Convertible/Folding Top Fully Down Position Switch: Circuit Short to Battery or Open	REFER to Section 501-11 .
B126E:23	Right Rear Window Fully Down Feedback: Signal Stuck Low	CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B126E:23 returns, GO to Pinpoint Test A .
B126E:24	Right Rear Window Fully Down Feedback: Signal Stuck High	CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B126E:24 returns, GO to Pinpoint Test A .
B126F:23	Left Rear Window Fully Down Feedback: Signal Stuck Low	CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B126F:23 returns, GO to Pinpoint Test A .
B126F:24	Left Rear Window Fully Down Feedback: Signal Stuck High	CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test. If DTC B126F:24 returns, GO to Pinpoint Test A .
B1278:12	Convertible/Foldable Top Up Relay: Circuit Short to Battery	GO to Pinpoint Test A .
B1278:14	Convertible/Foldable Top Up Relay: Circuit Short to Ground or Open	GO to Pinpoint Test A .
B1279:12	Convertible/Foldable Top Down Relay: Circuit Short to Battery	GO to Pinpoint Test A .
B1279:14	Convertible/Foldable Top Down Relay: Circuit Short to Ground or Open	GO to Pinpoint Test A .
B127A:12	Global Window Control: Circuit Short to Battery	REFER to Section 501-11 .
B127A:14	Global Window Control: Circuit Short to Ground or Open	REFER to Section 501-11 .
All Other DTCs	—	REFER to Section 419-10 .

Symptom Chart

Symptom Chart
Condition	Possible Sources	Action
The convertible top does not raise/lower	Fuse(s) Circuitry Convertible top lower relay Convertible top raise relay Convertible top switch Hydraulic motor and pump assembly LH rear window motor RH rear window motor Body Control Module B (BCM-B)	GO to Pinpoint Test A .
The convertible top does not operate correctly	Convertible top frame bows Convertible top side rails Hydraulic fluid leak Hydraulic lift cylinder Hydraulic motor and pump assembly Low hydraulic fluid	GO to Pinpoint Test B .
The convertible top drop function is inoperative/does not operate correctly	Circuitry Window motor BCM-B	REFER to Section 501-11 .
The convertible top is hard to latch or is aligned improperly	Convertible top adjustment	REFER to Convertible Top Alignment .

Pinpoint Tests

Pinpoint Test A: The Convertible Top Does Not Raise/Lower

Refer to Wiring Diagrams Cell 103 , Convertible Top for schematic and connector information.

Refer to Wiring Diagrams Cell 100 , Power Windows for schematic and connector information.

Normal Operation

The convertible top switch supplies a ground signal to the Body Control Module B (BCM-B) on circuit CPR23 (BU/OG) when the convertible top switch is depressed to the lower position, or circuit CPR24 (GN/VT) when the convertible top switch is depressed to the raise position. Ground is supplied to the convertible top switch through circuit GD139 (BK/YE). The convertible top system will not operate when the vehicle speed is greater than 5 km/h (3 mph) or if the ignition switch is in the START position. The convertible top hydraulic system uses a 12-volt reversible pump and motor assembly. When the BCM-B receives a request to operate the convertible top, the BCM-B sends a signal to the front and rear windows to lower the windows to the full DOWN position. The BCM-B monitors the status of the rear windows on circuit CPW53 (YE/OG) for the right rear window, and circuit CPW47 (VT/OG)/CPW53 (YE/OG) for the left rear window. When the BCM-B detects a full down signal from the RH and LH rear window motors, the convertible top operation is enabled. If the BCM-B does not detect a full down signal from the RH and LH rear window motors, the convertible top operation is disabled. When either the convertible top raise relay or the convertible top lower relay is activated, the other relay will remain in its normal state and supplies ground to the hydraulic motor and pump assembly. The convertible top raise and lower relay coils receive voltage at all times from circuit SBB35 (BU/RD). When the convertible top switch is pressed to the lower position, and the BCM-B detects a full down signal from the LH and RH rear window motors, the BCM-B activates the convertible top lower relay by grounding circuit CPR18 (WH/VT). When the convertible top lower relay is activated, voltage is supplied to the hydraulic motor and pump through circuit CPR20 (BU/BN). Ground is supplied to the hydraulic motor and pump assembly through circuit CPR21 (GN). When the convertible top switch is pressed in the raise position, and the BCM-B detects a full down signal from the LH and RH rear window motors, the BCM-B activates the convertible top raise relay by grounding circuit CPR19 (YE/BU). When the convertible top raise relay is activated, voltage is supplied to the hydraulic motor and pump assembly through circuit CPR21 (GN). Ground is supplied to the hydraulic motor and pump assembly through circuit CPR20 (BU/BN).

The hydraulic motor/pump assembly is equipped with a thermal circuit breaker. In the event of a concern, the circuit breaker will reset after approximately 5 minutes. The thermal circuit breaker is integral to the hydraulic motor and pump assembly and cannot be serviced separately.

DTC Description	Fault Trigger Conditions
B1267:11 — Convertible/Folding Top Activation Up Switch: Circuit Short to Ground	Short to ground in the convertible top switch raise circuit or switch is active in the raise position during self-test.
B1268:11 — Convertible/Folding Top Activation Down Switch: Circuit Short to Ground	Short to ground in the convertible top switch lower circuit or switch is active in the lower position during self-test.
B126E:23 — Right Rear Window Fully Down Feedback: Signal Stuck Low	When the delayed accessory relay is known to be inactive and the RH rear window motor fully down signal is still low, the BCM-B will set this DTC.
B126E:24 — Right Rear Window Fully Down Feedback: Signal Stuck High	When the BCM-B does not see the RH rear window fully down signal pulled low, this DTC will set. Convertible top will not operate when this condition is present.
B126F:23 — Left Rear Window Fully Down Feedback: Signal Stuck Low	When the delayed accessory relay is known to be inactive and the LH rear window motor fully down signal is still low, the BCM-B will set this DTC.
B126F:24 — Left Rear Window Fully Down Feedback: Signal Stuck High	When the BCM-B does not see the LH rear window fully down signal pulled low, this DTC will set. Convertible top will not operate when this condition is present.
B1278:12 — Convertible/Foldable Top Up Relay: Circuit Short to Battery	Short to voltage in the convertible top up relay control circuit.
B1278:14 — Convertible/Foldable Top Up Relay: Circuit Short to Ground or Open	Short to ground or open in convertible top up relay control circuit.
B1279:12 — Convertible/Foldable Top Down Relay: Circuit Short to Battery	Short to voltage in the convertible top down relay control circuit.
B1279:14 — Convertible/Foldable Top Down Relay: Circuit Short to Ground or Open	Short to ground or open in convertible top down relay control circuit.

This pinpoint test is intended to diagnose the following:

Fuse(s)
Wiring, terminals or connectors
Convertible top raise relay
Convertible top lower relay
Convertible top switch
Hydraulic motor and pump assembly
LH or RH rear window motor
BCM-B

PINPOINT TEST A: THE CONVERTIBLE TOP DOES NOT RAISE/LOWER

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Test Step

Result / Action to Take

A1 RETRIEVE THE RECORDED DTCs FROM THE BCM-B

NOTE: Repair all Vehicle Speed Sensor (VSS) DTCs before proceeding with pinpoint test.
Retrieve the recorded BCM-B DTCs from the continuous and on-demand self tests.
Are any BCM-B DTCs recorded?

Yes
For DTC B1267:11 or B1268:11, GO to A6 . For DTC B1278:12, GO to A19 . For DTC B1278:14, VERIFY that Battery Junction Box (BJB) fuse 35 (40A) is OK. If OK, GO to A20 .

If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation. For DTC B1279:12, GO to A21 . For DTC B1279:14, VERIFY that fuse 35 (40A) is OK. If OK, GO to A22 .

If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation. For DTC B126E:23 or B126F:23, GO to A11 . For DTC B126E:24 or B126F:24, GO to A12 .

No
GO to A2 .

A2 CHECK THE VEHICLE SPEED INPUT

Ignition ON.
Enter the following diagnostic mode on the scan tool: PCM DataLogger.
Monitor the PCM VSS PID.
Does the PID display less than 5 km/h (3 mph)?

Yes
GO to A3 .

No
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to diagnose the .

A3 CHECK THE CONVERTIBLE/FOLDABLE TOP ACTIVATION SWITCH (CNV_TOP_UP and CNV_TOP_DWN) PID

Enter the following diagnostic mode on the scan tool: BCM-B DataLogger.
Monitor the BCM-B PIDs CNV_TOP_UP and CNV_TOP_DWN while activating the convertible top switch in the raise and lower positions.
Do the PID statuses agree with the convertible top switch positions?

Yes
GO to A9 .

No
GO to A4 .

A4 CHECK CIRCUIT 1205 (BK) AT THE CONVERTIBLE TOP SWITCH FOR AN OPEN

Ignition OFF.
Disconnect: Convertible Top Switch C9013.
Measure the resistance between convertible top switch C9013-5, circuit GD139 (BK/YE), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to A5 .

No
REPAIR the circuit. TEST the system for normal operation.

A5 CHECK CIRCUITS CPR23 (BU/OG) AND CPR24 (GN/VT) FOR AN OPEN

Disconnect: BCM-B C4368B.
Measure the resistance between convertible top switch C9013, harness side and BCM-B , harness side using the following chart:

Convertible Top Switch	Circuit	BCM-B
C9013-6	CPR23 (BU/OG)	C4368B-18
C9013-7	CPR24 (GN/VT)	C4368B-5

Are the resistances less than 5 ohms?

Yes
GO to A6 .

No
REPAIR the circuit(s). TEST the system for normal operation.

A6 CHECK CIRCUITS CPR23 (BU/OG) AND CPR24 (GN/VT) FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: Convertible Top Switch C9013.
Disconnect: BCM-B C4368B.
Measure the resistance between convertible top switch C9013-7, circuit CPR24 (GN/VT), harness side and ground; and between convertible top switch C9013-6, circuit CPR23 (BU/OG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to A7 .

No
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

A7 CHECK THE OPERATION OF THE CONVERTIBLE TOP SWITCH

Measure the resistance between the convertible top switch pin 7, component side and the convertible top switch pin 5, component side while operating the convertible top switch in the raise position; and between the convertible top switch pin 6, component side and the convertible top switch pin 5, component side while operating the convertible top switch in the lower position.
Are the resistances less than 5 ohms?

Yes
GO to A8 .

No
INSTALL a new convertible top switch. REFER to Convertible Top Switch in this section. TEST the system for normal operation.

A8 CHECK THE CONVERTIBLE TOP SWITCH

Measure the resistance between the convertible top switch pin 7, component side and the convertible top switch pin 5, component side; and between the convertible top switch pin 6, component side and the convertible top switch pin 5, component side.
Are the resistances greater than 10,000 ohms?

Yes
GO to A24 .

No
INSTALL a new convertible top switch. REFER to Convertible Top Switch in this section. CLEAR the DTCs. REPEAT the self-test.

A9 CHECK THE WINDOW OPERATION

Raise the front and rear windows to the full UP position.
Operate the convertible top switch.
Do the front and rear windows fully open?

Yes
GO to A10 .

No
REFER to Section 501-11 to diagnose the convertible top drop feature.

A10 CHECK THE REAR WINDOW FULLY DOWN FEEDBACK (R_WIN_DWN_L and R_WIN_DWN_R) PIDs

Raise the rear windows to the full UP position.
Enter the following diagnostic mode on the scan tool: BCM-B DataLogger.
While monitoring the BCM-B PIDs R_WIN_DWN_L and R_WIN_DWN_R, press and hold the convertible top switch until the rear windows reach the full DOWN position.
Does the status of both PIDs change from NOT ACTIVE to ACTIVE when the rear windows reach the full DOWN position?

Yes
GO to A15 .

No
GO to A12 .

A11 CHECK THE REAR WINDOW FULLY DOWN SIGNAL CIRCUIT OPERATION

Raise the LH and RH rear windows to the full UP position.
Ignition OFF.
Disconnect: BCM-B C4368B.
Ignition ON.
For DTC B126F:23, measure the resistance between BCM-B C4368B-3, circuit CPW47 (VT/OG), harness side and ground.
For DTC B126E:23, measure the resistance between BCM-B C4368B-16, circuit CPW53 (YE/OG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to A24 .

No
GO to A14 .

A12 CHECK THE REAR WINDOW FULLY DOWN FEEDBACK (R_WIN_DWN_L or R_WIN_DWN_R) PID

Ignition OFF.
Disconnect: DTC B126F:24: LH Rear Window Motor C3118.
Disconnect: DTC B126E:24: RH Rear Window Motor C3119.
Ignition ON.
Enter the following diagnostic mode on the scan tool: BCM-B DataLogger.
For DTC B126F:24, monitor the BCM-B PIDs R_WIN_DWN_L while connecting a fused jumper wire between LH rear window motor C3118-7, circuit CPW47 (VT/OG)/CPW53 (YE/OG), harness side and ground.
For DTC B126E:24, monitor the BCM-B PIDs R_WIN_DWN_R while connecting a fused jumper wire between RH rear window motor C3119-7, circuit CPW53 (YE/OG), harness side and ground.

Is the status of the PID ACTIVE when the fused jumper wire is connected?

Yes
INSTALL a new LH or RH rear window motor. REFER to Section 501-11 . TEST the system for normal operation.

No
GO to A13 .

A13 CHECK CIRCUIT CPW53 (YE/OG) OR CIRCUIT CPW47 (VT/OG) FOR AN OPEN

Ignition OFF.
Disconnect: BCM-B C4368B.
For DTC B126F:24, measure the resistance between BCM-B C4368B-3, circuit CPW47 (VT/OG), harness side and LH rear window motor C3118-7, circuit CPW47 (VT/OG)/CPW53 (YE/OG), harness side and ground.
For DTC B126E:24, measure the resistance between BCM-B C4368B-16, circuit CPW53 (YE/OG), harness side and RH rear window motor C3119-7, circuit CPW53 (YE/OG), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to A24 .

No
REPAIR the circuit(s). TEST the system for normal operation.

A14 CHECK CIRCUIT CPW53 (YE/OG) OR CPW47 (VT/OG) FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: DTC B126F:23: LH Rear Window Motor C3118.
Disconnect: DTC B126E:23: RH Rear Window Motor C3119.
For DTC B126F:23, measure the resistance between BCM-B C4368B-3, circuit CPW47 (VT/OG), harness side and ground.
For DTC B126E:23, measure the resistance between BCM-B C4368B-16, circuit CPW53 (YE/OG), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new LH or RH rear window motor as necessary. REFER to Section 501-11 . CLEAR the DTCs. REPEAT the self-test.

No
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

A15 CHECK FOR CONVERTIBLE TOP MOTOR OPERATION

Ignition OFF.
Disconnect: BCM-B C4368B.
Ignition ON.
Connect a fused jumper wire between BCM-B and ground to check convertible top motor operation:

To raise the convertible top, connect a fused jumper wire between BCM-B C4368B-6, circuit CPR19 (YE/BU), harness side and ground.

To lower the convertible top, connect a fused jumper wire between BCM-B C4368B-19, circuit CPR18 (WH/VT), harness side and ground.

Does the convertible top motor operate in both directions?

Yes
GO to A24 .

No
GO to A16 .

A16 CHECK FOR VOLTAGE TO THE CONVERTIBLE TOP RELAYS

Disconnect: Convertible Top Raise Relay C4063.
Disconnect: Convertible Top Lower Relay C4064.
Measure the voltage between convertible top raise relay C4063-85 and C4063-87, circuit SBB35 (BU/RD), harness side and ground; and between convertible top lower relay C4064-85 and C4064-87, circuit SBB35 (BU/RD), harness side and ground.

Are the voltages greater than 10 volts?

Yes
GO to A17 .

No
VERIFY fuse 35 (40A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.

If not OK, REFER to the Wiring Diagrams manual to identify the possible cause of the circuit short. REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.

A17 CHECK CIRCUIT GD110 (BK/WH) FOR AN OPEN

Ignition OFF.
Measure the resistance between convertible top raise relay C4063-87A, circuit GD110 (BK/WH), harness side and ground; and between convertible top lower relay C4064-87A, circuit GD110 (BK/WH), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to A18 .

No
REPAIR the circuit. TEST the system for normal operation.

A18 CHECK THE CONVERTIBLE TOP RELAYS

Carry out the relay component test for the convertible top raise relay and the convertible top lower relay.
Refer to Wiring Diagrams Cell 149 for component testing.
Did the convertible top raise relay and the convertible top lower relay pass the relay component test?

Yes
GO to A19 .

If no DTCs, GO to A23 .

No
INSTALL a new convertible top raise relay or convertible top lower relay. TEST the system for normal operation.

A19 CHECK CIRCUIT CPR19 (YE/BU) FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: BCM-B C4368B.
Disconnect: Convertible Top Raise Relay C4063.
Ignition ON.
Measure the voltage between convertible top raise relay C4063-86, circuit CPR19 (YE/BU), harness side and ground.

Is any voltage present?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to A24 .

A20 CHECK CIRCUIT CPR19 (YE/BU) FOR A SHORT TO GROUND OR AN OPEN

Ignition OFF.
Disconnect: BCM-B C4368B.
Disconnect: Convertible Top Raise Relay C4063.
Measure the resistance between convertible top raise relay C4063-86, circuit CPR19 (YE/BU), harness side and BCM-B C4368B-6, circuit CPR19 (YE/BU), harness side; and between convertible top raise relay C4063-86, circuit CPR19 (YE/BU), harness side and ground.

Is the resistance less than 5 ohms between the convertible top raise relay and the BCM-B ; and greater than 10,000 ohms between the convertible top raise relay and ground?

Yes
CARRY OUT the relay component test for the convertible top raise relay.

Refer to Wiring Diagrams Cell 149 for component testing.

If the convertible top raise relay does not pass the component test, INSTALL a new convertible top raise relay. CLEAR the DTCs. REPEAT the self-test.

If the convertible top raise relay passes the component test, GO to A24 .

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A21 CHECK CIRCUIT CPR18 (WH/VT) FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: BCM-B C4368B.
Disconnect: Convertible Top Lower Relay C4064.
Ignition ON.
Measure the voltage between convertible top lower relay C4064-86, circuit CPR18 (WH/VT), harness side and ground.

Is any voltage present?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to A24 .

A22 CHECK CIRCUIT CPR18 (WH/VT) FOR A SHORT TO GROUND OR AN OPEN

Ignition OFF.
Disconnect: BCM-B C4368B.
Disconnect: Convertible Top Lower Relay C4064.
Measure the resistance between convertible top lower relay C4064-86, circuit CPR18 (WH/VT), harness side and BCM-B C4368B-19, circuit CPR18 (WH/VT), harness side; and between convertible top lower relay C4064-86, circuit CPR18 (WH/VT), harness side and ground.

Is the resistance less than 5 ohms between the convertible top lower relay and the BCM-B ; and greater than 10,000 ohms between the convertible top lower relay and ground?

Yes
CARRY OUT the relay component test for the convertible top lower relay.

Refer to Wiring Diagrams Cell 149 for component testing.

If the convertible top lower relay does not pass the component test, INSTALL a new convertible top lower relay. CLEAR the DTCs. REPEAT the self-test.

If the convertible top lower relay passes the component test, GO to A24 .

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A23 CHECK CIRCUITS CPR20 (BU/BN) AND CPR21 (GN) FOR AN OPEN

Ignition OFF.
Disconnect: Convertible Top Motor C4062.
Measure the resistance between convertible top motor C4062, harness side and the convertible top lower and raise relays using the following chart:

Convertible Top Motor	Circuit	Convertible Top Raise/Lower Relay(s)
C4062-1	CPR21 (GN)	C4063-30
C4062-2	CPR20 (BU/BN)	C4064-30

Are the resistances less than 5 ohms?

Yes
INSTALL a new convertible top motor. REFER to Hydraulic System, Lift Cylinder and Motor in this section. TEST the system for normal operation.

No
REPAIR the circuit(s). TEST the system for normal operation.

A24 CHECK FOR CORRECT BCM-B OPERATION

Ignition OFF.
Disconnect all the BCM-B connectors.
Check for:

corrosion.

pushed-out pins.

Connect all the BCM-B connectors and make sure they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?

Yes
INSTALL a new . REFER to Section 419-10 . CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Pinpoint Test B: The Convertible Top Does Not Operate Correctly

Refer to Wiring Diagrams Cell 103 , Convertible Top for schematic and connector information.

Normal Operation

The convertible top hydraulic system uses a 12-volt reversible pump and motor assembly. When active, the pump uses hydraulic pressure to extend the hydraulic lift cylinders to raise the convertible top, or retract the hydraulic lift cylinders to lower the convertible top. The convertible top assembly is a floating frame, Z-fold design. The main pivot brackets are attached to the body, and the convertible top frame side rails expand or fold when the convertible top is raised or lowered. The convertible top frame bows attach to the convertible top frame side rails and provide tension for the convertible top material.

This pinpoint test is intended to diagnose the following:

Convertible top frame bows
Convertible top side rails
Hydraulic fluid leak
Hydraulic lift cylinders
Hydraulic motor/pump assembly
Low hydraulic fluid

PINPOINT TEST B: THE CONVERTIBLE TOP DOES NOT OPERATE CORRECTLY

Test Step	Result / Action to Take
B1 CHECK THE HYDRAULIC FLUID LEVEL
Lower the convertible top. Gain access to the hydraulic motor and pump assembly. NOTE: Make sure that the hydraulic lift cylinders are fully retracted before checking the hydraulic fluid level. Inspect the hydraulic reservoir and check the hydraulic fluid level. Is the hydraulic fluid level at the "+" sign that is molded into the hydraulic reservoir?	Yes GO to B4 . No GO to B2 .
B2 CHECK THE HYDRAULIC SYSTEM FOR LEAKS
Inspect all hydraulic fittings and hoses for hydraulic fluid leaks. Are any hydraulic fluid leaks present?	Yes REPAIR the leaking hydraulic fitting or INSTALL a new hydraulic hose as necessary. BLEED the hydraulic system. REFER to System Bleeding in this section. TEST the system for normal operation. No GO to B3 .
B3 FILL THE HYDRAULIC SYSTEM
NOTE: The hydraulic fluid level should be at the "+" sign that is molded into the hydraulic reservoir. Add hydraulic fluid to the hydraulic fluid reservoir. Operate the convertible top system. Does the convertible top system operate correctly?	Yes The concern is not present at this time. RETURN the vehicle to the customer. No BLEED the hydraulic system. REFER to System Bleeding in this section. TEST the system for normal operation.
B4 CHECK THE CONVERTIBLE TOP LINKAGE
Remove the hydraulic lift cylinder bolts and disconnect the hydraulic lift cylinders from the convertible top linkage. NOTE: The convertible top is not adjustable. If the convertible top frame is damaged or requires adjustment, the damaged components must be replaced. Manually operate the convertible top assembly up and down while observing the convertible top linkage. Does the linkage operate smoothly without binding?	Yes GO to B5 . No INSTALL new components as necessary. REFER to Convertible Top Bows or Convertible Top Side Rail in this section. TEST the system for normal operation.
B5 CHECK THE HYDRAULIC LIFT CYLINDERS
Operate the hydraulic system using a 12-volt fused (40A) power source. Do the hydraulic lift cylinders extend and retract fully and evenly?	Yes GO to B6 . No BLEED the hydraulic system. REFER to System Bleeding in this section. If concern is still present after bleeding the hydraulic system, INSTALL a new hydraulic lift cylinder. REFER to Hydraulic System, Lift Cylinder and Motor in this section. TEST the system for normal operation.
B6 BLEED THE HYDRAULIC SYSTEM
Bleed the hydraulic system. Refer to System Bleeding in this section. Operate the convertible top system upward and downward 3 times. Does the convertible top system operate correctly?	Yes The concern is not present at this time. RETURN the vehicle to the customer. No INSTALL a new motor and pump assembly. REFER to Hydraulic System, Lift Cylinder and Motor in this section. TEST the system for normal operation.