DDM-29

DDM-29-DRIVER RECLINER AND LUMBAR OUT SWITCH OPEN





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously.

- Set Condition:
If the switch MUX circuit is over 4.9 volts for over 10 second, this code will set.





Diagnostic Test

1. DTC PRESENT
Turn the ignition on.
With the scan tool, erase DTCs.
Cycle the ignition switch from Off to Run.
Operate the switch indicated by the scan tool in all positions several times.
With the scan tool, read DTCs.
Does the scan tool display the same DTC?

Yes

- Go To2

No

- The condition that caused this code to set is not present at this time. Review wiring schematics and inspect related wiring for an intermittent condition.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

2. DRIVER SEAT SWITCH MUX CIRCUIT VOLTAGE
Turn the ignition on.
With the scan tool in Sensors, read the Seat Switch voltage of the switch that had the DTC.
Select the voltage displayed.

4.4 to 5.1 volts.

- Go To3

Over 5.2 volts

- Go To5

3. (P311) DRIVER SEAT RECLINER/LUMBAR OUT SWITCH MUX OPEN




Disconnect the Driver Seat Switch connector.
Turn the ignition on.
Measure the voltage of the (P311) Driver Seat Recliner/Lumbar Out Switch circuit and ground.
Is the voltage between 4.4 and 5.1 volts?

Yes

- Go To4

No

- Repair the (P311) Driver Seat Recliner/Lumbar Out Switch MUX wire for an open.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

4. (P989) SEAT SWITCH MUX RETURN




Turn the ignition off.
Disconnect the Driver Seat Switch connector.
Measure the resistance of the (P989) Seat Switch MUX Return circuit in the switch connector to ground.
Is the resistance below 5.0 ohms?

Yes

- Replace the Driver Seat Switch.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

No

- Repair the (P989) Seat Switch MUX Return for an open.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

5. (P311) DRIVER SEAT RECLINER/LUMBAR OUT SWITCH MUX SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the Driver Door Module C2 connector.
Inspect the (P311) Driver Seat Recliner/Lumbar Out Switch circuit for a possible short to voltage.
Were there any problems found?

Yes

- Repair the (P311) Driver Seat Recliner/Lumbar Out Switch circuit for a short to voltage.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

No

- Replace the Driver Door Module.
- PERFORM BODY VERIFICATION TEST - VER 1.Body Verification Test