B1785

Diagnostic Trouble Code (DTC) Chart:

Refer to Memory Seats Schematics: Memory Seat Outputs. Electrical Diagrams

CIRCUIT DESCRIPTION
The Memory Seat Module (MSM) controls the seat recliner motor power and ground through CKT 276 (LT GRN) and CKT 277 (LT BLU). The MSM also senses the seat recliner motor position through a hall sensor within the motor through CKT 570 (WHT/BLK) while utilizing CKT 570 (BLK) as a sensor ground.

CONDITIONS FOR SETTING THE DTC
The DTC will set if the MSM detects through the hall sensor that the recliner motor is not responding to the MSM 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 free 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 inspects the wiring between the seat recliner motor and the MSM for open circuits.
4. This step repairs the open(s) in the wiring between the seat recliner motor and the MSM.
5. This step inspects the wiring between the seat recliner motor and the MSM for short(s) to ground.
6. This step repairs the short(s) to ground in the wiring between the seat recliner motor and the MSM.
7. This step verifies proper MSM operation.
8. This step replaces a defective seat recliner motor.
9. This step replaces a defective MSM.