B0687

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The SECURITY indicator lamp notifies the driver of the theft deterrent system status. The theft deterrent module controls the operation of the SECURITY indicator lamp. The SECURITY indicator lamp is part of the Instrument Panel cluster. The Instrument Panel cluster provides positive voltage to the SECURITY indicator lamp bulb when the ignition switch is in RUN, Bulb Test, or CRANK position. A control circuit is wired between the Instrument Panel cluster and the theft deterrent module. This control circuit allows the theft deterrent module to provide a path to ground to the SECURITY indicator lamp bulb causing it to remain off, turn on, or flash based on system status. Refer to system operation for indicator statues.

CONDITIONS FOR RUNNING THE DTC
The ignition switch must be in the RUN, Bulb Test or START position.

CONDITIONS FOR SETTING THE DTC
The theft deterrent module detects a short to ground in the SECURITY indicator lamp control circuit for one second.

ACTION TAKEN WHEN THE DTC SETS
- DTC B0687 and DTC B0689 cycle as current DTCs every five seconds in the theft deterrent module.
- DTC B0687 is set as a history DTC in the theft deterrent module's non-volatile memory.

CONDITIONS FOR CLEARING THE MIL/DTC
- The theft deterrent module no longer detects a short to ground condition in the SECURITY indicator lamp control circuit during the ignition cycle.
- A history DTC will clear after 100 consecutive fault-free ignition cycles. An ignition cycle consists of an ignition switch transition from LOCK/OFF to RUN.
- Using a scan tool.

DIAGNOSTIC AIDS
- Check if the SECURITY indicator lamp remains on when the ignition switch is in RUN. This indicates a short to ground in the SECURITY indicator lamp control circuit.
- A poor or intermittent connection may cause this DTC to set. Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION
2. Determines whether the condition is currently present or intermittent.
3. Checks for an intermittent short to ground in the SECURITY indicator control circuit.
4. Checks the SECURITY indicator control circuit for a short to ground.
5. Determines whether the short to ground is in the Instrument Panel cluster or in the theft deterrent module.