B1780

For wiring diagrams, refer to Memory Seats Schematics (Seat Adjuster Memory Module, Trandsucers, Motors).

Diagnostic Chart:

CIRCUIT DESCRIPTION
The seat adjuster memory module controls the seat rear height motor power and ground through CKT 282 (YEL) and CKT 283 (LT BLU). The seat adjuster memory module also senses the seat rear height motor position through the seat rear height transducer, utilizing CKT 568B (RED) for reference voltage and utilizing CKT 568A (BLK) as a sensor ground.

CONDITIONS FOR SETTING THE DTC
The DTC will set if the seat adjuster memory module detects that the rear height motor is not responding to the seat adjuster memory module commands due to the following conditions:
^ An open circuit
^ A short to ground
^ A short to power An inoperative motor

CONDITIONS FOR CLEARING THE DTC
^ A history DTC will clear after 100 consecutive fault tree ignition cycles.
^ Use a scan tool in order to clear history and current DTCs.

DIAGNOSTIC AIDS
One or more of the following conditions may be the cause of an intermittent failure:
^ A poor connection
^ A break in the wire insulation that exposes the internal wire
^ A wire broken inside the insulation

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step inspects for current DTCs.
3. This step locates and repairs open(s) in the wiring between the seat rear height motor and the seat adjuster memory module.
4. This step locates and repairs short(s) to ground in the wiring between the seat rear height motor and the seat adjuster memory module.
5. This step verifies that the seat adjuster memory module is supplying voltage to the seat rear height motor.
6. This step replaces a defective seat rear height motor.
7. This step replaces a defective seat adjuster memory module.