Illumination Lamps Inoperative - All Modes

Diagnostic Trouble Code Chart:

Wiring Schematics:

CIRCUIT DESCRIPTION
These components of the Video Entertainment System (VES) are illuminated when the park lamps are on:
^ The Auxiliary Video Module (AVM) controls
^ The Rear Seat Audio (RSA) controls
^ The Second Seat Audio (SSA) controls
^ The Third Seat Audio (TSA) controls

When the headlamp and I/P lamp dimmer switch is in the park or head position, CKT B provides B+ to the Interface Module (IM), which is bussed and then distributed to the AVM, SSA, TSA, and RSA.

Each component provides a path to ground CKT 150, thus turning their illumination lamps on.

DIAGNOSTIC AIDS
^ Check for the following conditions:
- An open in CKT 8 between S320 and the IM
- A faulty IM
^ An intermittent failure may be very difficult to detect and to diagnose accurately. Faulty electrical connections or wiring causes most intermittent problems. When an intermittent condition is suspected, check the suspected circuits for the following conditions:
- Poor mating of connector halves or backed out terminals
- Improperly formed or damaged terminals
- Wire chafing
- Poor wire to terminal connections
- Dirty or corroded terminals
- Damage to connector bodies
- Wire broken inside the insulation

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
1. Checks the integrity of the interior lights dimming circuit.
3. Determines whether CKT 8 is open or the IM is faulty.
6. Verifies repairs made to the VES.