GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Park Avenue 🢒 Body and Accessories 🢒 Seats 🢒 DTC B2101-B2112

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.

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 V 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The DTC automatically clears when the switch circuit setting the DTC is no longer active.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.

  1. Checks the existing state of the driver seat switch by using the current state of the signal parameter.

Step

Action

Yes

No

Schematic Reference: Memory Seats Schematics or Lumbar Support Schematics

Connector End View Reference: Power Seat Connector End Views

1

Did you perform the Diagnostic System Check - Power Seat Systems?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the appropriate Switch parameter in the Memory Seat Module data list.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. With a scan tool, observe the appropriate Switch parameter.
  2. Activate the appropriate switch.

Does the Switch parameter change state?

Go to Step 10

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the appropriate seat or lumbar switch connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the appropriate Switch parameter.

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. 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 memory seat module. Refer to Memory Seat Control Module Replacement .

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
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK