B1D87
B1D87-SEAT BACKREST MOTOR CONTROL CIRCUIT PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.
- When Monitored:
Whenever the seat motor is activated.
- Set Condition:
The seat switch is pressed three times in opposite directions (e.g. either, recliner up, recliner down, and recliner up, or recliner down, recliner up, and recliner down) and each switch activation is for at least one second and the Memory Seat Module (MSM) does not detect seat motor rotation in either direction.
1. CHECK FOR SEAT POSITION SENSOR DIAGNOSTIC TROUBLE CODES (DTCs)
1. Turn the ignition on.
2. Using a scan tool, read DTCs.
Does the scan tool display any seat position sensor DTCs?
Yes
- Diagnose and repair all seat position sensor DTCs. Testing and Inspection.
No
- Go To 2
2. TEST FOR INTERMITTENT CONDITION
1. Using a scan tool, record and erase DTCs.
2. Press the seat switch in one recliner adjustment direction for at least one second then release the switch. Repeat three times consecutively, but press the switch in the opposite direction each time
3. Using a scan tool, read DTCs.
Does the scan tool display: B1D87-SEAT BACKREST MOTOR CONTROL CIRCUIT PERFORMANCE?
Yes
- Go To 3
No
- The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
3. CHECK THE (G403) DRIVER SEAT RECLINER POSITION SENSE CIRCUIT AND THE (G493) DRIVER SEAT RECLINER POSITION SENSOR GROUND CIRCUIT FUNCTION
1. Turn the ignition off.
2. Disconnect the Driver Recliner Seat Adjuster Motor connector.
NOTE: Check connectors. Clean and repair as necessary.
3. Turn the ignition on.
4. Connect a 12-Volt test light between the (G403) Driver Seat Recliner Position Sense circuit and the (G493) Driver Seat Recliner Position Sensor Ground circuit at the Driver Recliner Seat Adjuster Motor connector.
5. Move the seat switch in the recliner adjust position.
Does the test light illuminate for approximately two seconds then turn off with the seat switch engaged?
Yes
- Go To 4
No
- Go To 5
4. CHECK THE (P141) DRIVER SEAT RECLINER UP DRIVER CIRCUIT AND THE (P143) DRIVER SEAT RECLINER DOWN DRIVER CIRCUIT FUNCTION
1. Connect a 12-Volt test light between the (P141) Driver Seat Recliner Up Driver circuit and the (P143) Driver Seat Recliner Down Driver circuit at the Driver Recliner Seat Adjuster Motor connector.
2. Move the seat switch in the recliner adjust position.
Does the test light illuminate with the seat switch engaged?
Yes
- Replace the Recliner Motor assembly.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Go To 7
5. CHECK THE (G403) DRIVER SEAT RECLINER POSITION SENSE CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Memory Seat Module C2 connector.
NOTE: Check connectors. Clean and repair as necessary.
3. Measure the resistance of the (G403) Driver Seat Recliner Position Sense circuit between the Driver Recliner Seat Adjuster Motor connector and the Memory Seat Module C2 connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 6
No
- Repair the (G403) Driver Seat Recliner Position Sense circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
6. CHECK THE (G493) DRIVER SEAT RECLINER POSITION SENSOR GROUND CIRCUIT FOR AN OPEN
1. Measure the resistance of the (G493) Driver Seat Recliner Position Sensor Ground circuit between the Driver Recliner Seat Adjuster Motor connector and the Memory Seat Module C2 connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the Memory Seat Module (MSM).
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Repair the (G493) Driver Seat Recliner Position Senor Ground circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
7. CHECK THE (P141) DRIVER SEAT RECLINER UP DRIVER CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Memory Seat Module C2 connector.
NOTE: Check connectors. Clean and repair as necessary.
3. Measure the resistance of the (P141) Driver Seat Recliner Up Driver circuit between the Driver Recliner Seat Adjuster Motor connector and the Memory Seat Module C2 connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 8
No
- Repair the (P141) Driver Seat Recliner Up Driver circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
8. CHECK THE (P143) DRIVER SEAT RECLINER DOWN DRIVER CIRCUIT FOR AN OPEN
1. Measure the resistance of the (P143) Driver Seat Recliner Down Driver circuit between the Driver Recliner Seat Adjuster Motor connector and the Memory Seat Module C2 connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the Memory Seat Module (MSM).
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Repair the (P143) Driver Seat Recliner Down Driver circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.