Glass, Frames and Mechanisms

Special Tool(s)

	Flex Probe Kit 105-R025D or equivalent
	Fluke 77-IV Digital Multimeter FLU77-4 or equivalent
	Test Light SGT27000 or equivalent 250-300 mA incandescent bulb test lamp
	Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Principles of Operation

Power Window Control

Each door window motor is a 7-pin motor with integral electronics and must be initialized whenever a new window motor has been installed. Initialization is required to learn the full UP position and the profile of the glass as it travels through the glass channel. Once initialized, obstacle detection is enabled. When mechanical repairs have been carried out on the window regulator or glass run, the window motor must be de-initialized, and then initialized. The window control switch sends 2 separate signals to the window motor: up and down. When the window control switch is pressed to the first detent position, a 12-volt signal is sent to the window motor to request an up or down operation. When auto up or auto down is requested (switch pressed to the second detent position), the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the signal first received. If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor will not be able to determine the intended direction request and will not operate until the window control switch is released and pressed again. The up and down contacts are floating within the window control switch when the switch is in the neutral position. The up and down feeds to the window motor are all low current.

When the window motor is operating in auto up or auto down mode, movement of the window can be stopped by pressing the switch to any position (up, down, auto up, auto down). The window control switch must be released before the window will move again.

If there is an open in the window control switch or the associated wiring, the related function will become inoperative. If the up contact of the switch or the associated wiring develops an open circuit, the window will only operate in the down direction. If the down contact of the switch or the associated wiring develops an open circuit, the window will only operate in the up direction.

A new window motor will not operate in one-touch up mode, and the bounce-back feature will be disabled prior to initialization. If the switch is actuated to the auto UP or auto DOWN position and released, window movement will stop when the up or down contact in the window control switch is released. If the window motor is removed from the window regulator drum housing, or if a new window motor is installed, it must be initialized. Refer to Window Motor Initialization in this section.

The window motor will automatically adjust to system changes throughout its life: changes in seal drag and slight changes in the full OPEN position will occur and will be automatically compensated for. Once initialized, the window motor will soft stall into the upper and lower positions contributing to extended durability of the system. If the window does not seal completely in the full UP position (very small gaps/non bounce-back events only), the window switch can be actuated to the UP position and the window will be energized for a fraction of a second to fully seal and this new position will be learned.

Bounce-Back

The window motor has a bounce-back feature. If an obstacle has been detected in the window opening as the window glass is moving upward, the window motor will automatically reverse direction and move the glass toward the bounce-back position (in both up and one-touch up modes). If an obstruction occurs between 4 mm (0.15 in) and 200 mm (7.87 in) of window opening, the bounce-back position will be 250 mm (9.84 in) of window opening. If an obstruction occurs at a position greater than 200 mm (7.87 in) of window opening, the bounce-back position will be 50 mm (1.96 in) below where the obstruction occurred.

Security Override

To override a bounce-back condition (to overcome the resistance of ice on the window or seals for example), within 2 seconds after the window reaches the bounce-back position, pull and hold the window control switch. The window will travel up with no bounce-back or pinch protection. If the window control switch is released before the window is fully closed, the window will stop. If the ignition switch is turned to OFF or START (without delayed accessory), the window motor will stop.

Rear Window Defrost

When the rear window defrost switch (integral to the Front Controls Interface Module (FCIM)) is pressed, a message is sent to the HVAC module through the Controller Area Network (CAN). When the HVAC module receives the rear window defrost request, it will activate the rear window defrost relay located in the Battery Junction Box (BJB). When the rear window defrost relay is active, the rear window defrost grid will be energized.

The HVAC module will deactivate the rear window defrost relay when one of the following conditions is met:
• The rear window defrost switch is pressed when the feature is active.
• Ignition switch state is changed from RUN to OFF/LOCK.
• The 10 minute timing function is completed.

Delayed Accessory Power

The accessory delay relay (located in the Smart Junction Box (SJB)) supplies voltage to operate the power windows. The SJB activates the accessory delay relay whenever the ignition switch is in the RUN or the ACCESSORY position, or when the ignition switch is changed from RUN or ACCESSORY to the OFF/LOCK position and the LH and RH doors are closed.

The SJB will deactivate the accessory delay relay when:
• the LF door is ajar and the ignition switch is in the OFF/LOCK or KEY-OUT position.
• the RF door is ajar and the ignition switch is in the OFF/LOCK or KEY-OUT position.
• ten minutes have elapsed since the ignition switch was changed from ACC or RUN to the OFF/LOCK position.

Convertible Power Rear Quarter Window Operation

For convertible, when the convertible top switch is operated (to raise or lower the convertible top), the Body Control Module B (BCM-B) sends a signal to the window motors to activate a full down operation of all 4 windows. 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.

Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.

  Visual Inspection Chart

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

4. 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).

5. 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.

6. 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 Body Control Module B (BCM-B), Smart Junction Box (SJB) or HVAC module.

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

8. NOTE: The SJB may also be identified as the Generic Electronic Module (GEM).

   Clear the CMDTCs and carry out the self-test diagnostics for the BCM-B , SJB and HVAC module.

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

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

DTC Charts

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. Continuous Memory Diagnostic Trouble Codes (CMDTCs) have an additional 2-character DTC status code suffix to assist in determining DTC history.

 Body Control Module B (BCM-B) 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. Continuous Memory Diagnostic Trouble Codes (CMDTCs) have an additional 2-character DTC status code suffix to assist in determining DTC history.

 HVAC Module DTC Chart

 Smart Junction Box (SJB) DTC Chart

Symptom Chart

Pinpoint Tests

Pinpoint Test A: A Single Power Window is Inoperative — LH Front

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

Normal Operation

Under normal operation, the LH front power window motor receives high current power at all times through circuit SBB34 (YE/RD). Ground is provided to the LH front power window motor through circuit GD133 (BK). The LH front power window control switch and LH front power window motor receive low current power from the accessory delay relay through circuit CBP41 (BU). When the LH front window control switch is operated in the UP position, the LH front window motor receives a voltage signal through circuit CPW11 (BU/GY). When the LH front window control switch is operated in the DOWN position, the LH front window motor receives a voltage signal through circuit CPW10 (YE/VT).

This pinpoint test is intended to diagnose the following:
• Fuse
• Wiring, terminals or connectors
• Window control switch
• Window motor

PINPOINT TEST A: A SINGLE POWER WINDOW IS INOPERATIVE — LH FRONT

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

Pinpoint Test B: A Single Power Window is Inoperative — RH Front

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

Normal Operation

Under normal operation, the RH front power window motor receives high current power at all times through circuit SBB29 (GY/RD). Ground is provided to the RH front power window motor through circuit GD139 (BK/YE). The RH front power window motor receives low current power from the accessory delay relay through circuit CBP41 (BU). Voltage is supplied to the LH and RH front window control switch through circuit CBP41 (BU). When the LH front or RH front window control switch is operated in the UP position, the RH front window motor receives a voltage signal through circuit CPW13 (BN/YE). When the RH front or LH front window control switch is operated in the DOWN position, the RH front window motor receives a voltage signal through circuit CPW12 (GN/OG).

This pinpoint test is intended to diagnose the following:
• Fuse
• Wiring, terminals or connectors
• Window control switch
• Window motor

PINPOINT TEST B: A SINGLE POWER WINDOW IS INOPERATIVE — RH FRONT

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

Pinpoint Test C: A Single Power Window is Inoperative — Rear Quarter

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

Normal Operation

The quarter window motors receive high current voltage at all times through circuits SBP01 (RD)/SBP04 (GN/RD) (LH) and SBP04 (GN/RD) (RH). With the accessory delay relay is active, the rear window control switch and quarter window motors receive voltage through circuit CBP41 (BU). Ground is provided to the quarter window motors through circuits GD109 (BK)/GD110 (BK/WH) (LH) and GD110 (BK/WH) (RH).

When the window control switch is operated in the UP position, a voltage signal is supplied to the LH/RH quarter window motors through circuit CPW25 (YE/BU). When the window control switch is operated to the DOWN position, a voltage signal is supplied to the LH/RH quarter window motors through circuit CPW26 (BU/BN).

The Body Control Module B (BCM-B) disables/inhibits 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.

This pinpoint test is intended to diagnose the following:
• Fuse(s)
• Wiring, terminals or connectors
• Rear window control switch
• Window motor
• BCM-B

PINPOINT TEST C: A SINGLE POWER WINDOW IS INOPERATIVE — REAR QUARTER

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

NOTE: If BCM-B on-demand DTC B126D:15 or B1269:11 is present, the rear quarter windows may still function during convertible top operation, but will not function when commanded by the window control switch. Refer to the Body Control Module B (BCM-B) DTC Chart for diagnosis.

Pinpoint Test D: The Defrost System is Inoperative

Refer to Wiring Diagrams Cell 56 , Heated Window for schematic and connector information.

Normal Operation

When the engine is running and the defrost switch (integral to the Front Controls Interface Module (FCIM)) is pressed, the FCIM sends the defrost request message to the HVAC module over the Controller Area Network (CAN). The HVAC module activates the rear window defrost relay by grounding the relay coil. When the rear window defrost relay is activated, power is supplied from the relay to the rear window defrost grid.

• DTC B1C83:11 (Rear Defog Relay: Circuit Short to Ground) — When the HVAC module senses a short to ground on the rear window defrost relay control circuit, this DTC will set.
• DTC B1C83:13 (Rear Defog Relay: Circuit Open) — When the HVAC module senses an open on the rear window defrost relay control circuit, this DTC will set.

This pinpoint test is intended to diagnose the following:
• Fuse(s)
• Rear window defrost relay
• Wiring, terminals or connectors
• Rear window defrost grid
• HVAC module
• FCIM

PINPOINT TEST D: THE DEFROST SYSTEM IS INOPERATIVE

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

Pinpoint Test E: The Defrost System Will Not Shut Off Automatically

Refer to Wiring Diagrams Cell 56 , Heated Window for schematic and connector information.

Normal Operation

When the engine is running and the defrost switch (integral to the Front Controls Interface Module (FCIM)) is pressed, the FCIM sends the defrost request message to the HVAC module over the Controller Area Network (CAN). The HVAC module activates the rear window defrost relay by grounding the relay coil. When the rear window defrost relay is activated, power is supplied from the relay to the rear window defrost grid.

• DTC B1C83:12 (Rear Defog Relay: Circuit Short to Battery) — When the HVAC module senses a short to voltage on the rear window defrost relay control circuit, this DTC will set.

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Rear window defrost relay
• HVAC module

PINPOINT TEST E: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLY

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

Pinpoint Test F: The Short Drop Windows Do Not Operate Correctly

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

Normal Operation

The short drop window feature is activated when one (or both) of the doors are opened, which opens a door ajar switch. When the driver door is opened (opening the driver door ajar switch), a signal on circuit CPL26 (GN/VT) is interpreted by the driver window motor that the driver door is open. The driver window motor then carries out the short drop function on the driver window. When the passenger door is opened (opening the passenger door ajar switch), a signal on circuit CPL31 (WH) is interpreted by the passenger window motor that the passenger door is open. The passenger window motor then carries out the short drop function on the passenger window. This feature is on both the coupe and the convertible.

This pinpoint test is intended to diagnose the following:
• Window motor not initialized
• Wiring, terminals or connectors
• Door ajar switch
• Window motor

PINPOINT TEST F: THE SHORT DROP WINDOWS DO NOT OPERATE CORRECTLY

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

Pinpoint Test G: The Convertible Top Drop Function is Inoperative/Does Not Operate Correctly

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

Normal Operation

The convertible top drop function is activated when the convertible top switch is operated. When the Body Control Module B (BCM-B) sees the voltage drop on circuit CPR23 (BU/OG) (lower) or CPR24 (GN/VT) (raise), the BCM-B first sends a signal to all 4 window motors on circuit CPW73 (GN/VT). At this time, all 4 window motors operate to the fully DOWN position. The rear window motors have a fully down sensor the BCM-B monitors through circuits CPW47 (VT/OG) and CPW53 (YE/OG). When the BCM-B sees that the LH and RH rear windows are fully down, it then grounds circuit CPR18 (WH/VT) (lower relay) or CPR19 (YE/BU) (raise relay) to activate the desired relay and operate the convertible top in the requested direction. If the BCM-B does not see the correct signal from the LH rear and RH rear window full down sensors, the BCM-B does not allow the convertible top to operate.

• DTC B127A:12 (Global Window Control : Circuit Short to Battery) — A single low-side driver is connected to all 4 smart motors. A short to voltage in this circuit will set this DTC.
• DTC B127A:14 (Global Window Control : Circuit Short to Ground or Open) — A single low-side driver is connected to all 4 smart motors. An open or short to ground in this circuit will set this DTC.

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Window motor
• BCM-B

PINPOINT TEST G: THE CONVERTIBLE TOP DROP FUNCTION IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

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

Pinpoint Test H: The Delayed Accessory is Inoperative

Normal Operation

The accessory delay relay is located in the Smart Junction Box (SJB). When the key is turned ON, the SJB activates the accessory delay relay by grounding the relay coil, and power is sent to all window motors and control switches. When the key is turned OFF, the SJB continues to ground the accessory delay relay coil for approximately 10 minutes, or until a door is opened.

• DTC B1302 (Accessory Delay Relay Coil Circuit Failure) — Sets when an open or short to ground is detected on the relay control circuit.
• DTC B1304 (Accessory Delay Relay Coil Circuit Short to Battery) — Sets when a short to voltage is detected on the relay control circuit.

This pinpoint test is intended to diagnose the following:
• Fuse(s)
• Accessory delay relay
• Wiring, terminals or connectors
• SJB

PINPOINT TEST H: THE DELAYED ACCESSORY IS INOPERATIVE

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

Pinpoint Test I: The Delayed Accessory Does Not Turn Off

Normal Operation

The accessory delay relay is located in the Smart Junction Box (SJB). When the key is turned ON, the SJB activates the accessory delay relay by grounding the relay coil, and power is sent to all window motors and control switches. When the key is turned OFF, the SJB continues to ground the accessory delay relay coil for approximately 10 minutes, or until a door is opened.

• DTC B1302 (Accessory Delay Relay Coil Circuit Failure) — sets when an open or short to ground is detected on the relay control circuit.

This pinpoint test is intended to diagnose the following:
• Accessory delay relay
• Wiring, terminals or connectors
• SJB

PINPOINT TEST I: THE DELAYED ACCESSORY DOES NOT TURN OFF

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

Pinpoint Test J: DTCs B126D:15 or B1269:11

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 Body Control Module B (BCM-B) monitors the status of the convertible top through circuits CPR92 (BU/GY) and CPR93 (YE/GY). When the convertible top is in the full UP position, the convertible top ajar switch closes and provides ground to circuit CPR92 (BU/GY). When the convertible top is in the full DOWN position, the convertible top ajar switch closes and provides ground to circuit CPR93 (YE/GY). Ground is provided to the convertible top ajar switch through circuit GD110 (BK/WH). DTC B126D:15 sets if the convertible top ajar switch on-demand self test is run with the convertible top not in the full DOWN position. DTC B1269:11 sets if the convertible top ajar switch on-demand self test is run with the convertible top in the full UP position. If DTC B126D:15 or B1269:11 is present, the rear quarter windows may still function during convertible top operation, but will not function when commanded by the window control switch.

• DTC B126D:15 (Convertible/Folding Top Fully Down Position Switch: Circuit Short to Battery or Open) — This DTC will set if the convertible top ajar switch on-demand self test is run with the convertible top not in the full DOWN position.
• DTC B1269:11 (Convertible/Folding Top Fully Up Position Switch: Circuit Short to Ground) — This DTC will set if the convertible top ajar switch on-demand self test is run with the convertible top in the full UP position.

This pinpoint test is intended to diagnose the following:
• Wiring, terminals or connectors
• Convertible top ajar switch
• BCM-B

PINPOINT TEST J: DTCs B126D:15 OR B1269:11

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

Pinpoint Test K: The One-Touch Up/Down Feature is Inoperative

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

Normal Operation

During normal operation, when the window control switch is pressed to the second detent position to request an auto up or auto down operation, the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the signal first received (first detent position). If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor will not be able to determine the intended direction request and will not operate until the window control switch is released and pressed again.

This pinpoint test is intended to diagnose the following:
• Window motor not initialized
• Window control switch
• Window motor

PINPOINT TEST K: THE ONE-TOUCH UP/DOWN FEATURE IS INOPERATIVE

Component Tests

Grid Wire Test

1. Using a bright lamp inside the vehicle, inspect the wire grid from the exterior. A broken grid wire appears as a brown spot.

2. Run the engine at idle. Set the heated rear window switch to ON. The heated rear window indicator should come on.

3. Working from the interior of the vehicle with a voltmeter, contact the broad red-brown stripes of the heated rear window positive lead to battery side and the negative lead to ground side. The meter should read 10-13 volts. A lower voltage reading indicates a loose ground connection.

4. Contact a good ground point with the negative lead of the meter. The voltage reading should not differ.

5. With the negative lead of the meter grounded, touch each grid line of the heated rear window at its midpoint with the positive lead. A reading of approximately 6 volts indicates the line is good. A reading of zero volts indicates the line is broken between the midpoint and the B+ side of the grid line. A reading of 12 volts indicates the circuit is broken between the midpoint of the grid line and ground.