Circuit Description
The memory seat module (MSM) switches are normally grounded. When the power seat switches are pressed they send a 12-volt signal to the MSM. The MSM commands the driver seat to move in response to the switch inputs.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B2101 LF Seat Lumbar Horizontal Feedback Circuit Performance |
| • | DTC B2102 LF Seat Lumbar Horizontal Feedback Circuit Low |
| • | DTC B2103 LF Seat Lumbar Horizontal Feedback Circuit High |
| • | DTC B2104 LF Seat Lumbar Horizontal Feedback Circuit Open |
| • | DTC B2105 LF Seat Lumbar Vertical Position Sensor Circuit |
| • | DTC B2106 LF Seat Lumbar Vertical Position Sensor Circuit Performance |
| • | DTC B2107 LF Seat Lumbar Vertical Position Sensor Circuit Low |
| • | DTC B2108 LF Seat Lumbar Vertical Position Sensor Circuit High |
| • | DTC B2109 LF Seat Lumbar Vertical Position Sensor Circuit Open |
| • | DTC B2110 LF Seat Lumbar Vertical Feedback Circuit |
| • | DTC B2111 LF Seat Lumbar Vertical Feedback Circuit Performance |
| • | DTC B2112 LF Seat Lumbar Vertical Feedback Circuit Low |
Conditions for Running the DTC
The MSM must be powered. The MSM checks the switch inputs and the position sensor signals continuously.
Conditions for Setting the DTC
If a seat direction switch circuit is closed to 12-volt for 30 seconds after the motor controlled by that switch circuit reaches the end of its travel, the MSM sets the DTC for that switch circuit. The switch DTCs will also set if the sensor monitoring motion in the direction commanded has failed and sets a DTC.
Action Taken When the DTC Sets
| • | A motor output driven in response to the switch considered failed is deactivated for both directions. |
| • | All memory recall commands are ignored. |
| • | The MSM will respond to any other switch input that has not set a DTC. |
Conditions for Clearing the DTC
The DTC automatically clears when the switch circuit setting the DTC is no longer active.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool display Idle? | Go to Step 3 | Go to Step 4 | |
3 |
Does the switch parameter change state? | Go to Step 10 | Go to Step 4 |
4 |
Does the scan tool display Idle? | Go to Step 7 | Go to Step 5 |
5 | Test the switch signal circuit for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the memory seat module (MSM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the seat adjuster switch assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the MSM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the seat adjuster switch. Refer to Power Seat Switch Replacement or Lumbar Switch Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
