Anti-Theft - Perimeter

PINPOINT TEST A: THE ALARM SYSTEM DOES NOT OPERATE CORRECTLY

A1-A4:

A5-A9:

A10-A12:

A12-A14:

A14-A16:

A16-A18:

A18-A19:

A20-A21:

Normal Operation
The lighting control module (LCM) receives an unlock signal from the door disarm switch through circuit 25 (DB/VT) by using the ground through circuit 57 (BK), and turns off the anti-theft perimeter alarm. The LCM monitors the key-in-ignition switch and does not allow the perimeter anti-theft feature to arm until after the key is removed from the ignition lock cylinder, all doors, hood, luggage compartment lid are closed, and 20 seconds have elapsed after locking the vehicle. After all of these criteria have been met, the anti-theft feature will arm.

The LCM monitors the hood ajar switch on circuit 1304 (VT/OG) to prevent the alarm from being armed while the hood is open. If the LCM does not receive a ground signal on circuit 1304 (VT/OG), the LCM will not arm the alarm. The hood ajar switch is grounded by circuit 57 (BK). After the perimeter alarm is armed, the LCM monitors the hood ajar switch on circuit 1304 (VT/OG) to determine if an unauthorized entry to the vehicle has occurred. If the hood ajar switch closes circuit 1304 (VT/OG) to ground (with the perimeter alarm armed), the LCM will activate the perimeter alarm.

If equipped, the trunk pull-down module monitors the luggage compartment lid ajar switch on circuit 486 (BR/WH). The switch status is provided to the LCM by the trunk pull-down module through circuit 700 (WH/VT). If the trunk pull-down module does not receive a ground signal on circuit 486 (BR/WH), the LCM will not arm the alarm. The luggage compartment lid ajar switch is grounded by circuit 57 (BK).

The driver door module (DDM) receives arm/disarm commands from the remote keyless entry (RKE) transmitter and sends a message over the standard corporate protocol (SCP) communication link to the LCM. The LCM then arms/disarms the perimeter alarm system.

When the alarm is activated, the LCM intermittently grounds the horn relay, causing the horn to sound in regular intervals, and intermittently sends voltage to the turn signals, causing the turn signal lamps to flash in regular intervals.

DTC B1520 - sets when circuit 1304 (VT/OG) or circuit 57 (BK) is open. The hood switch may also be open internally.

DTC B2100 - sets when circuit 24 (DB/OG) or circuit 25 (DB/VT) is shorted to ground. The door disarm switch may also be shorted internally.

DTC B2108 - sets when circuit 1350 (WH/PK) is shorted to ground. The luggage compartment lid disarm switch may also be shorted internally.

Possible Causes
- Circuit 24 (DB/OG) open, short to ground or voltage
- Circuit 25 (DB/VT) open, short to ground or voltage
- Circuit 57 (BK) open
- Circuit 486 (BR/WH) open, short to ground or voltage
- Circuit 700 (WH/VT) open, short to ground or voltage
- Circuit 1350 (WH/PK) open, short to ground or voltage
- Door disarm switch
- Hood ajar switch
- Luggage compartment lid disarm switch
- Keyless entry keypad
- RKE transmitter battery
- RKE transmitter
- LCM
- DDM