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B1D87






B1D87-SEAT BACKREST MOTOR CONTROL CIRCUIT PERFORMANCE





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Whenever the seat motor is activated.

- Set Condition:
The seat switch is pressed three times in opposite directions (e.g. either, recliner forward, recliner rearward, and recliner forward, or recliner rearward, recliner forward, and recliner rearward) 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. INSPECT FOR OBSTRUCTION IN SEAT PATH
1. Verify seat harness is routed correctly.
2. Inspect seat for damage.
3. Inspect for anything that would prevent the seat from moving to each end-stop.

Is anything present that would prevent the seat from moving to each end-stop?

Yes

- Repair as necessary.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

No

- Go To 2

2. 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 3

3. TEST FOR INTERMITTENT CONDITION
1. Using a scan tool, record and erase DTCs.
2. Move the seat switch in one recliner adjustment direction for at least one second then release the switch. Repeat three times consecutively, but move the switch in the opposite direction each time.
3. Using a scan tool, read DTCs.

Does the scan tool display DTC B1D87-SEAT BACKREST MOTOR CONTROL CIRCUIT PERFORMANCE?

Yes

- Go To 4

No

- The conditions that caused this code to set are not present at this time. 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.

4. 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. Disconnect the scan tool.
4. Turn off all vehicle interior and exterior lighting.
5. Mark sure all doors are closed then wait 10 seconds.
6. 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.
7. Move the seat switch in the recliner adjust position then release the switch.

Does the test light illuminate for approximately five seconds then turn off?

Yes

- Go To 5

No

- Go To 9

5. 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

- Go To 6

No

- Go To 11

6. CHECK THE DRIVER SEAT RECLINER ADJUSTER MOTOR OPERATION




1. Turn the ignition off.
2. Reconnect the Driver Recliner Seat Adjuster Motor connector.
3. Disconnect the MSM C2 connector.

NOTE: Check connectors. Clean and repair as necessary.

4. Check motor operation in both directions as follows:NOTE: Do not adjust the seat against an end-stop when performing the following.

To drive seat back forward:
- Connect one end of a fused jumper wire to battery Voltage and the other end to the (P141) Driver Seat Recliner Up Driver circuit at the MSM C2 connector.
- Connect an ammeter between ground and the (P143) Driver Seat Recliner Down Driver circuit at the MSM C2 connector.
- Disconnect before reaching the end-stop.

To drive seat back rearward:
- Connect one end of a fused jumper wire to battery Voltage and the other end to the (P143) Driver Seat Recliner Down Driver circuit at the MSM C2 connector.
- Connect an ammeter between ground and the (P141) Driver Seat Recliner Up Driver circuit at the MSM C2 connector.
- Disconnect before reaching the end-stop.

NOTE: The seat motor should be operational in both directions and the ammeter should read approximately 2.0 amps reclining backward and 2.5 amps reclining forward.

Does the motor operate as specified?

Yes

- Go To 7

No

- Check (P141) Driver Seat Recliner Up Driver circuit and (P143) Driver Seat Recliner Down Driver circuit for high resistance. If circuits are okay, replace the Recliner motor assembly.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

7. CHECK THE DRIVER SEAT RECLINER ADJUSTER MOTOR SENSOR OPERATION




1. Reconnect the MSM C2 connector.
2. Turn the ignition on.
3. Using a scan tool, erase DTCs.
4. Connect the positive lead of a lab scope to the (G403) Driver Seat Recliner Position Sense circuit and the negative lead to the (G493) Driver Seat Recliner Position Sensor Ground circuit at the MSM C2 connector. Set the lab scope range to 20 Volts and time to 20 ms divisions.

NOTE: Do not adjust the seat against an end-stop when performing the following.

5. Move the seat switch in one recliner adjust position.

NOTE: If the sensor is functioning normally the scope will display a continuously cycling square wave when operating the seat. If the module fails to detect sensor operation it will stop seat operation in approximately two seconds.

Does the sensor operate as specified?

Yes

- Leave Scope Connected. Go To 8

No

- Replace the Recliner motor assembly.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

8. CHECK THE DRIVER SEAT RECLINER ADJUSTER MOTOR SENSOR OPERATION IN OPPOSITE DIRECTION




1. Using a scan tool, erase DTCs if present.

NOTE: Do not adjust the seat against an end-stop when performing the following.

2. Move the seat switch in the direction opposite of that previously selected.

NOTE: If the sensor is functioning normally the scope will display a continuously cycling square wave when operating the seat. If the module fails to detect sensor operation it will stop seat operation in approximately two seconds.

Does the sensor operate as specified?

Yes

- Replace the Memory Seat Module (MSM).
- Perform APS VERIFICATION TEST. APS Verification Test.

No

- Replace the Recliner motor assembly.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

9. CHECK THE (G403) DRIVER SEAT RECLINER POSITION SENSE CIRCUIT FOR AN OPEN




1. Disconnect the MSM C2 connector.

NOTE: Check connectors. Clean and repair as necessary.

2. Measure the resistance of the (G403) Driver Seat Recliner Position Sense circuit between the Driver Recliner Seat Adjuster Motor connector and the MSM C2 connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 10

No

- Repair the (G403) Driver Seat Recliner Position Sense circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

10. 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 MSM 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.

11. CHECK THE (P141) DRIVER SEAT RECLINER UP DRIVER CIRCUIT FOR AN OPEN




1. Disconnect the MSM C2 connector.

NOTE: Check connectors. Clean and repair as necessary.

2. Measure the resistance of the (P141) Driver Seat Recliner Up Driver circuit between the Driver Recliner Seat Adjuster Motor connector and the MSM C2 connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 12

No

- Repair the (P141) Driver Seat Recliner Up Driver circuit for an open.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

12. 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 MSM 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.

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