Circuit Description
When the memory recall switches are pressed they send a 12-volt signal to the memory seat module (MSM)/driver position module (DPM). The MSM/DPM then commands the driver seat to move in response to the switch inputs.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B2757 Memory 1 Select Switch Circuit Low |
| • | DTC B2762 Memory 2 Select Switch Circuit Low |
| • | DTC B2767 Memory Set Switch Circuit Low |
| • | DTC B2772 Memory Exit Switch Circuit Low |
Conditions for Running the DTC
The MSM/DPM must be powered and cannot have B1327 - Battery Voltage Low as an active DTC for this DTC to set.
Conditions for Setting the DTC
| • | If a memory switch continues to be active for 30 seconds after the last motor controlled by MSM/DPM reaches the end of its travel, the switch will be considered shorted and the MSM/DPM will set a switch DTC. |
| • | If a position sensor DTC is current and the associated switch is active for 30 continuous seconds, the switch will be considered shorted and the MSM/DPM will set a switch DTC. |
Action Taken When the DTC Sets
| • | Current and history codes are set. |
| • | All memory recall commands and class 2 Driver Identifier are ignored. |
| • | The MSM/DPM will respond to any other switch signal 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| • | The DTC automatically clears when the switch circuit setting the DTC is no longer active. |
| • | The MSM/DPM will clear the history DTC after 50 fault free ignition cycles. |
Diagnostic Aids
The MSM is also known as the DPM for this vehicle.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Checks the existing state of the memory switch by using the current state of the switch parameter.
-
This step verifies the repair.
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 Inactive? | Go to Step 3 | Go to Step 4 | |
3 |
Does the switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 |
Does the scan tool display Inactive for the switch parameter? | Go to Step 7 | Go to Step 5 |
5 | Test the switch signal circuit that displays active for a short to 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)/driver position module (DPM). 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 memory function switch. 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/DPM. 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 memory function switch. Refer to Driver Seat Adjuster and Recliner Switch Replacement . Did you complete the replacement? | Go to Step 10 | -- |
Does the DTC reset? | Go to Step 2 | System OK | |
