Auxiliary Video Module (AVM) Inoperative

Diagnostic Trouble Code Chart:

Wiring Schematics:

CIRCUIT DESCRIPTION
The Auxiliary Video Module (AVM) controls the operation of the Video Entertainment System (VES). The AVM turns on the VES when the video screen is placed in the down position. When the VES relay is energized, the AVM receives voltage through CKT 40. The AVM receives ground through CKT 150. The AVM determines when the video screen is in the down position by means of a screen position switch located in the video screen. When the VES relay is energized, the AVM sends a voltage signal to the screen position switch. When the video screen is moved from the up (stored) to the down position, the screen position switch closes and sends a voltage signal back to the AVM. Then, the AVM turns on the VES.

DIAGNOSTIC AIDS
^ Check for the following conditions:
- An open in CKT 40 between S291 and the AVM
- An open in CKT 150 between S292 and the AVM
- An open in CKT 40 between the AVM and the video screen
- A faulty video screen
- A faulty AVM
^ 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. Tests if the VES relay is operating correctly.
3. Tests for an open in CKT 40 (voltage supply to the AVM).
5. Tests for an open in CKT 150 (ground circuit to the AVM).
7. Tests voltage output to the video display screen position switch.
9. Tests the operation of the video display screen position switch.
11. Verifies repairs made to the VES.