B1D79
B1D79-SEAT RECLINER POSITION SENSOR CIRCUIT LOW
- When Monitored:
Continuously.
- Set Condition:
If Voltage on the (G403) Driver Seat Recliner Position Sense circuit is not within a specified range.
1. CHECK FOR ACTIVE FAULT WITH SEAT STATIONARY
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Cycle the ignition from on to off three times.
4. Turn the ignition on and wait 30 seconds.
5. Using a scan tool, read DTCs.
Is DTC B1D79-SEAT RECLINER POSITION SENSOR CIRCUIT LOW active?
Yes
- Go To 3
No
- Go To 2
2. CHECK FOR ACTIVE FAULT WHILE ADJUSTING THE SEAT
1. Move the seat switch in the recliner adjust position three times.
2. Using a scan tool, read DTCs.
Is DTC B1D79-SEAT RECLINER POSITION SENSOR CIRCUIT LOW active?
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 FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the MSM C2 connector.
3. Disconnect the Driver Recliner Seat Adjuster Motor connector.
NOTE: Check connectors. Clean and repair as necessary.
4. Measure the resistance of the (G403) Driver Seat Recliner Position Sense circuit between ground and the Driver Recliner Seat Adjuster Motor connector.
Is the resistance below 10K Ohms?
Yes
- Repair the (G403) Driver Seat Recliner Position Sense circuit for a short to ground.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Go To 4
4. CHECK THE (G403) DRIVER SEAT RECLINER POSITION SENSE CIRCUIT FOR A SHORT TO THE (G493) DRIVER SEAT RECLINER POSITION SENSOR GROUND CIRCUIT, THE (P141) DRIVER SEAT RECLINER UP DRIVER CIRCUIT, AND THE (P143) DRIVER SEAT RECLINER DOWN DRIVER CIRCUIT
1. Measure the resistance 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.
2. Measure the resistance between the (G403) Driver Seat Recliner Position Sense circuit and the (P141) Driver Seat Recliner Up Driver circuit at the Driver Recliner Seat Adjuster Motor connector.
3. Measure the resistance between the (G403) Driver Seat Recliner Position Sense circuit and the (P143) Driver Seat Recliner Down Driver circuit at the Driver Recliner Seat Adjuster Motor connector.
Is the resistance below 10K Ohms for any measurement?
Yes
- Repair all circuits with a resistance below 10K Ohms for a short to the (G403) Driver Seat Recliner Position Sense circuit.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Go To 5
5. CHECK THE (G403) DRIVER SEAT RECLINER POSITION SENSE CIRCUIT AND THE (G493) DRIVER SEAT RECLINER POSITION SENSOR GROUND CIRCUIT FUNCTION
1. Reconnect the MSM C2 connector.
2. Disconnect the scan tool.
3. Turn off all vehicle interior and exterior lighting.
4. Mark sure all doors are closed then wait 10 seconds.
5. 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.
6. 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
- Replace the Driver Recliner Seat Adjuster Motor assembly.
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.
No
- Replace the Memory Seat Module (MSM).
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.