Circuit Description
The memory seat module (MSM) receives inputs from the left lumbar switch. When you operate a switch, the switch becomes grounded. The MSM recognizes the input and moves the lumbar support in the appropriate direction. When any lumbar positioning switch input continues to be active for 30 seconds after motion in the requested direction has ceased, the switch is considered shorted. If a lumbar position sensor DTC is currently set, and a switch in the direction associated with the suspect sensor has been active for 30 seconds, the switch is considered shorted.
Conditions for Setting the DTC
The MSM sets the appropriate DTC whenever the MSM detects a switch failure.
Action Taken When the DTC Sets
| • | Motor outputs being driven in response to the suspect switch de-activate. |
| • | The MSM continues to respond to valid inputs from the other positioning switches. |
| • | All memory recall commands are ignored. |
Conditions for Clearing the DTC
The MSM does not detect the switch failure during the last monitoring cycle.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform the Power Seat Systems Diagnostic System Check? | -- | Go to Step 2 | ||
2 |
Does the DTC reset after 30 seconds? | -- | Go to Step 3 | Go to Step 4 |
3 | Repair the short to ground in CKT 1066 (WHT). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 5 | -- |
4 | Replace the left lumbar switch. Refer to Power Seat Switch Replacement . Is the left lumbar switch replacement complete? | -- | Go to Step 5 | -- |
5 |
Did you clear the DTCs and perform the Power Seat Systems Diagnostic System Check? | -- | -- |
