B0687

Diagnostic Trouble Code Charts (Part 1 Of 6):

Diagnostic Trouble Code Charts (Part 2 Of 6):

Diagnostic Trouble Code Charts (Part 3 Of 6):

Diagnostic Trouble Code Charts (Part 4 Of 6):

Diagnostic Trouble Code Charts (Part 5 Of 6):

Diagnostic Trouble Code Charts (Part 6 Of 6):

Wiring Schematic:

CIRCUIT DESCRIPTION
The VIM controls the operation of the SECURITY indicator lamp by providing ground at terminal M. Lamp control is based upon inputs from the following components:
^ The VCM
(Class 2 Data, terminal C and terminal D)
^ The ignition switch (Ignition 1, terminal J, CKT 39)
^ The brake pedal (Stop Lamps, terminal L) The SECURITY indicator (SECURITY Indicator Control, terminal M)
^ The signals received from the transmitter in the key fob

CONDITIONS FOR SETTING THE DTC
When the VIM is commanding the lamp to turn off, and the voltage is measured at the VIM terminal M is less than 2 volts, DTC B0687 is set.

CONDITIONS FOR CLEARING THE MIL/DTC
1. A history DTC will clear after 100 consecutive ignition cycles occur without a fault.
2. Use the Scan Tool in order to clear the history and the current DTCs.

DIAGNOSTIC AIDS
Most intermittent faults are caused by a faulty electrical connection or the wiring. Damaged VIM's are occasionally at fault. Refer to Intermittent and Poor Connections in Troubleshooting Procedures 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) in the Security System Indicator Circuit Low Table.
2. This test identifies the malfunction as lamp does not come on (open circuit) or lamp always on (short to ground).
3. This test inspects for an open power feed fuse to the lamp
4. This test inspects for a circuit malfunction causing the open fuse.
7. This test inspects that the Vehicle Immobilizer Module (VIM) is receiving the ignition 1 signal (no open in the power feed wire).
9. This test inspects for an open indicator lamp bulb.
11. This test inspects for an open in the SECURITY indicator control circuit.
13. This test inspects for bad connections that prevent the lamp from lighting.
16. This test inspects for a short to ground in the SECURITY indicator control circuit.
18. This test determines it the malfunction is due to a short to ground in the SECURITY indicator control circuit.