GM Service Manual Online
For 1990-2009 cars only

Refer to

Cell 141: Power, Ground, DLC and Power Seat Adjuster Switch


Object Number: 382172  Size: FS
Cell 10: Power Seats, Power Windows Circuit Breakers and RAP Relays
Cell 10: Power Seats, Power Windows Circuit Breakers and RAP Relays
Power Seat Connector End Views
Handling ESD Sensitive Parts Notice
Cell 14: S313 and S419
Power Seat Systems Components
Memory Seat Circuit Description
Cell 141: Memory Seat Module, Transducers and Motors
.

Circuit Description

The memory seat module (MSM) receives the seat manual movement inputs from the power seat adjuster switch. The MSM sends a 12 volt reference to the adjuster switch. Operating the switch grounds the appropriate circuit through CKT 1350. This changes the signal from high to low. The MSM supplies battery positive voltage (B+) to the appropriate motors when the appropriate motor's signal is received.

Conditions for Setting the DTC

The DTC will set if the MSM detects one of the following conditions:

    • The seat lateral switch forward or rearward input is active and no response is received from the sensor.
    • The seat front height switch front up or front down input is active and no response is received from the sensor.
    • The seat rear height switch front up or front down input is active and no response is received from the sensor.
    • The seat recliner switch forward or rearward input is active and no response is received from the sensor.

Conditions for Clearing the DTC

    • A history DTC will clear after 100 consecutive fault free ignition cycles.
    • Use a scan tool in order to clear history and current DTCs.

Diagnostic Aids

One or more of the following conditions may be the cause of an intermittent failure:

    • A poor connection
    • A break in the wire insulation that exposes the internal wire
    • A wire broken inside the insulation

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step inspects for current DTCs.

  2. This step inspects the wiring between the power seat adjuster switch and the MSM for open circuits.

  3. This step repairs the open(s) in the wiring between the power seat adjuster switch and the MSM.

  4. This step inspects the wiring between the power seat adjuster switch and the MSM for short(s) to ground.

  5. This step repairs the short(s) to ground in the wiring between the power seat adjuster switch and the MSM.

  6. This step replaces a defective power seat adjuster switch.

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Seat Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Turn the ignition switch to the OFF position.
  2. Install the scan tool.
  3. Turn the ignition switch to the RUN position.
  4. Using the scan tool, clear the DTCs.
  5. Operate the MSM controls.

Does DTC B3792 reset?

--

Go to Step 3

Go to Diagnostic System Check - Power Seat Systems

3

Using a J 39200 digital multimeter (DMM), test the continuity of each of the following circuits from the memory seat module (MSM) to the power seat adjuster switch:

    • CKT 1522 (TAN)
    • CKT 1523 (LT BLU)
    • CKT 1518 (DK GRN)
    • CKT 1520 (DK BLU)
    • CKT 1519 (YEL)
    • CKT 1521 (LT BLU)
    • CKT 1269 (GRY/BLK)
    • CKT 1270 (DK GRN/WHT)

Is continuity present on all circuits?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open circuit(s).

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

--

5

  1. Disconnect the MSM.
  2. Use a J 39200 DMM in order to test for continuity to ground at each of the following circuits at the MSM connector:
  3. • CKT 1522 (TAN)
    • CKT 1523 (LT BLU)
    • CKT 1518 (DK GRN)
    • CKT 1520 (DK BLU)
    • CKT 1519 (YEL)
    • CKT 1521 (LT BLU)
    • CKT 1269 (GRY/BLK)
    • CKT 1270 (DK GRN/WHT)

Is continuity present on any circuit?

--

Go to Step 6

Go to Step 7

6

Locate and repair the short(s) to ground.

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

--

7

  1. Replace the power seat adjuster switch.
  2. Clear the DTCs.

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

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