For 1990-2009 cars
Power Seat Systems Components
Memory Seat Circuit Description
Memory Seats Schematics

### Circuit Description

The memory seat module monitors the resistance through the seat adjuster switch. Switch inputs to the memory seat module are determined by continuity through a combination of seat adjuster switch circuits. seat adjuster switch circuits are shared among individual switches, this limits the ability of the memory seat module to interpret simultaneous switch inputs.

### Conditions for Setting the DTC

DTC 21 will set if:

• | One or more of the seat adjuster switches are shorted or jammed or its circuits are faulty.

• | The memory seat module is faulty.

### Action Taken When the DTC Sets

DTC 21 will set and the power seat functions will be disabled.

### Conditions for Clearing the DTC

DTC 21 will clear when the fault is no longer present.

### Diagnostic Aids

• | Inspect the seat adjuster switch operation or for any type of physical damage.

• | Inspect the switch connector to the memory seat module for damage.

### Test Description

The following numbers refer to the step numbers on the diagnostic table:

1. This step tests for a short or stuck switch contacts in the seat adjuster switch.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Power Seats Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Power Seat Systems
2 | Disconnect the seat adjuster switch connector from the memory seat module. Does the DTC 21 clear when the switch connector is disconnected? | -- | Go to Step 3 | Go to Step 5
3 | Inspect and repair the seat adjuster switch circuits and connector for any damage. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 4
4 | Replace the seat adjuster switch. Refer to Power Seat Switch Replacement . Is the repair complete? | -- | Go to Step 6 | --
5 | Replace and program the memory seat module. Refer to Memory Seat Control Module Replacement and Memory Seat Control Module Programming . Is the repair complete? | -- | Go to Step 6 | --
6 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the system in order to verify the repair.

Does the DTC reset?

--

Go to Step 2

System OK