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Diagnostic Trouble Code Charts (Part 1 Of 2):

Diagnostic Trouble Code Charts (Part 2 Of 2):

Wiring Schematic:

CIRCUIT DESCRIPTION
The Vehicle Immobilizer Module (VIM) controls the operation of the SECURITY indicator lamp by providing ground at the VIM terminal M. Lamp control is based upon signals received from the transmitter in the key fob and inputs from the following components:
^ the VCM
(Class 2 Data, terminal C and terminal D)
^ the ignition switch (Ignition 1 terminal J)
^ the brake pedal (Stop Lamps, terminal L)
^ the SECURITY indicator (SECURITY Indicator Control, terminal M)

CONDITIONS FOR SETTING THE DTC
When the VIM is commanding the lamp on and the voltage measured at VIM terminal M is greater than 7 volts, DTC B0688 is set.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC will clear after 100 consecutive ignition cycles have occurred without a fault.
^ History and current DTCs can be cleared by using the Tech 2 scan tool.

INTERMITTENT AND POOR CONNECTIONS
Most intermittent faults are caused by a faulty electrical connection or wiring, although a damaged VIM module can occasionally be at fault. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems for a detailed explanation of how to locate and repair intermittent conditions. Intermittents and Poor Connections

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This test inspects for a short to voltage in the SECURITY indicator control circuit.
4. This test inspects for a shorted indicator lamp.
6. This test determines whether the malfunction is due to a short to voltage in the Instrument Panel Cluster circuitry or a malfunctioning Vehicle Immobilizer Module (VIM).