Anti-Theft

Special Tool(s)

	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
	Flex Probe Kit NUD105-R025D or equivalent

Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

When the perimeter alarm is armed, the SJB monitors the door ajar switches, the hood switch, the luggage compartment lid ajar switch, and the Body Control Module B (BCM-B) sends a message over the local interconnect network to arm the intrusion and inclination sensor.

If any intrusion is detected without the alarm being deactivated, the SJB activates the perimeter alarm and sounds the horn and flashes the turn signals in regular intervals.

The system arms when:

• the driver door is locked with the key in the door lock cylinder (which does not activate the intrusion or inclination systems)
• the doors are locked with the Remote Keyless Entry (RKE) transmitter (this arms the entire system)
• the doors are locked with the door lock control switch (with the door open) and then the accompanying door is closed (this also arms the entire system)

If the doors are locked using the manual push buttons, no part of the perimeter alarm is armed. The SJB monitors the status of all entry points. If any entry point is open, the alarm arms everything except for the open entry point. The SJB adds the entry point to the protected status when the closure of the open entry point is detected. Note that only when the system is armed by locking the door using the key in the door lock cylinder is there no intrusion/inclination protection. Arming the system (locking the doors) using the RKE transmitter or using the door lock control switch allows the intrusion/inclination protection to also arm.

NOTE: The intrusion sensing feature is not activated if either door or the convertible top (if equipped) is open when the vehicle is armed.

The SJB inhibits the intrusion and inclination sensor and the luggage compartment lid ajar inputs if the luggage compartment lid is opened with the RKE transmitter . Once the luggage compartment lid is closed, the intrusion and inclination sensor and the luggage compartment lid ajar switch are monitored by the SJB .

Perimeter Alarm Arming

The system can be armed using any of the following methods:

• Press the door lock control switch to the lock position with the accompanying door open, then close it (then wait 20 seconds for the pre-arm phase to expire)
• Press the LOCK button on the RKE transmitter (then wait 20 seconds for the pre-arm phase to expire)
• Turn the key in the door lock cylinder to the lock position (then wait 20 seconds for the pre-arm phase to expire). This is the only way to arm the perimeter alarm system without also arming the inclination/intrusion feature

Perimeter Alarm Disarming

The system can be disarmed using any of the following methods (these steps also deactivate an activated alarm):

• Press the UNLOCK button on the RKE transmitter (part of the IKT key)
• Turn the key in the door lock cylinder to the unlock position
• Turn a programmed Passive Anti-Theft System (PATS) key in the ignition lock cylinder to the ON position

Perimeter Alarm Deactivation

To deactivate an activated alarm (this step will not disarm the alarm), press the PANIC button on the RKE transmitter.

Alarm Event PIDs

The SJB has PIDs available that show what caused the last alarm events. The 4 SJB alarm event PIDs are AL_EVT1 through 4. The cause for the most recent alarm activation is always listed in the first alarm event PID. These PIDs display what caused the alarm to activate and can be a very useful tool when trying to identify the cause of a false alarm activation.

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 PCM.

7. 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 the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the Body Control Module B (BCM-B) and the SJB .

9. If the DTCs retrieved are related to the concern, go to DTC Charts. For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in Section 419-10 .

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

DTC Charts

 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 DTCs have an additional 2-character DTC status code suffix to assist in determining DTC history.

 Smart Junction Box (SJB) DTC Chart

Symptom Chart

Pinpoint Tests

Pinpoint Test A: The Alarm System Does Not Arm/Disarm From The Driver Door Lock Cylinder

Refer to Wiring Diagrams Cell 117 , Remote Keyless Entry and Alarm for schematic and connector information.

NOTE: The intrusion and inclination protection features cannot be activated when locking the vehicle with the door lock cylinder. This allows raising the vehicle on a hoist, transporting or towing the vehicle, or when authorized motion inside the vehicle is likely.

Normal Operation

The Smart Junction Box (SJB) monitors the driver door lock through the set/reset switch (part of the driver door latch) and the set and reset input circuits. When a key in the door lock cylinder is turned to the lock position it grounds the set circuit signalling the SJB to arm the alarm. When a key in the door lock cylinder is turned to the unlock position it grounds the reset circuit signalling the SJB to disarm the alarm. The driver door latch has a dedicated ground circuit that is used for the door ajar and set/reset switches.

• DTC B2100 (Door Driver Key Cylinder Switch Failure) — an on-demand that sets when the SJB detects a short to ground on the driver door lock cylinder set or reset input circuits.

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors
• Door disarm switch (part of the door latch)
• SJB

PINPOINT TEST A: THE ALARM SYSTEM DOES NOT ARM/DISARM FROM THE DRIVER DOOR LOCK CYLINDER

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: The Alarm System Does Not Activate From An Unauthorized Entry At The Hood

Refer to Wiring Diagrams Cell 117 , Remote Keyless Entry and Alarm for schematic and connector information.

Normal Operation

When the alarm system is armed, the Smart Junction Box (SJB) monitors the hood ajar switch. If the hood is opened while the alarm is armed, the hood ajar switch removes ground from the signal circuit. This signals the SJB that an unauthorized intrusion to the engine compartment has occurred and the SJB activates the alarm.

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors
• Hood switch
• SJB

PINPOINT TEST B: THE ALARM SYSTEM DOES NOT ACTIVATE FROM AN UNAUTHORIZED ENTRY AT THE HOOD

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: DTC B1520

Refer to Wiring Diagrams Cell 117 , Remote Keyless Entry and Alarm for schematic and connector information.

Normal Operation

When the alarm system is armed, the Smart Junction Box (SJB) monitors the hood ajar switch. If the hood is opened while the alarm is armed, the hood ajar switch removes ground from the signal circuit. This signals the SJB that an unauthorized intrusion to the engine compartment has occurred and the SJB activates the perimeter alarm.

• DTC B1520 (Hood Switch Circuit Open) — an on-demand DTC that sets when the SJB detects an open in the hood switch circuit during the self-test. This DTC sets if the hood is open during a self-test.

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors
• Hood switch
• SJB

PINPOINT TEST C: DTC B1520

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

Pinpoint Test D: The Alarm System Does Not Arm/No Turn Signal Flash Confirmation

Normal Operation

The Smart Junction Box (SJB) controls the perimeter alarm system and based on inputs either arms, disarms or activates the alarm. When the alarm is activated, the SJB sounds the horn and flashes the turn signals in regular intervals. The SJB receives inputs for the door lock status, hood ajar, door ajar, luggage compartment lid ajar and the intrusion and inclination sensor. The SJB also receives signals from the Remote Keyless Entry (RKE) transmitters.

For the perimeter alarm to arm and provide a flash of the turn signals, the following conditions must be met:

• Ignition must be OFF
• The hood closed
• All doors closed
• The luggage compartment lid closed
• An electronic lock command received from an RKE transmitter or door lock control switch (a door opened and then shut after lock is pressed).

Once all the conditions are met, the alarm system enters a pre-arm phase and begins a 20-second countdown. After 20 seconds have passed and no unlock command is received or any hood or door is opened, the perimeter alarm arms.

The perimeter alarm is activated when:

• any door, the hood, or the luggage compartment lid is opened without an electronic unlock command from an RKE transmitter or driver door lock cylinder first.
• the intrusion and inclination sensor detects movement inside the vehicle or the vehicle angle has been changed.
• the ignition is turned to the RUN position without a valid Passive Anti-Theft System (PATS) key read received.

This pinpoint test is intended to diagnose the following:

• Door ajar input
• Hood ajar input
• Luggage compartment lid ajar input
• Turn signals
• Intrusion and inclination sensor
• RKE transmitter concern
• SJB

PINPOINT TEST D: THE ALARM SYSTEM DOES NOT ARM/NO TURN SIGNAL FLASH CONFIRMATION

Pinpoint Test E: The Alarm System Does Not Operate Correctly — Intrusion and Inclination Sensing

Refer to Wiring Diagrams Cell 117 , Remote Keyless Entry and Alarm for schematic and connector information.

NOTE: All the windows must be closed for correct intrusion sensing operation.

NOTE: The inclination sensing feature must be disarmed before raising the vehicle on a hoist to prevent false alarms.

Normal Operation

Arming the perimeter alarm (anti-theft) system by using the key in the door lock cylinder inhibits the intrusion and inclination sensing features. The intrusion and inclination sensing features can be activated by using the Remote Keyless Entry (RKE) transmitter or the door lock control switch to lock the vehicle and arm the perimeter alarm system. The convertible top (if equipped), the luggage compartment lid, and all the doors must be closed for the intrusion sensing feature to activate. The intrusion and inclination sensor receives voltage at all times and has a dedicated ground circuit. When the sensor senses a change in motion or in inclination, the change is communicated to the Body Control Module B (BCM-B) through the local interconnect network. The BCM-B sends a message over the Medium Speed Controller Area Network (MS-CAN) to the Smart Junction Box (SJB). The SJB then activates the perimeter alarm.

• DTC B109F:08 (Intrusion Sensor Module: Bus Signal / Message Failures) — is a continuous memory and on-demand DTC that sets when there is a failure in the inclination sensor communication link between the intrusion sensor module and the BCM-B .

This pinpoint test is intended to diagnose the following:

• Fuse
• Wiring, terminals or connectors
• Intrusion and inclination sensor
• BCM-B

PINPOINT TEST E: THE ALARM SYSTEM DOES NOT OPERATE CORRECTLY — INTRUSION AND INCLINATION SENSING

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