GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD 🢒 Body and Accessories 🢒 Seats 🢒 DTC B3792 Seat Switch CKT Malfunction

Circuit Description

The seat adjuster memory module receives the seat manual movement inputs from the seat adjuster switch. The seat adjuster memory module 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 seat adjuster memory module 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 seat adjuster memory module 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.

  2. This step locates and repairs open(s) in the wiring between the seat adjuster switch and the seat adjuster memory module.

    3.

  3. This step locates and repairs short(s) to ground in the wiring between the seat adjuster switch and the seat adjuster memory module.

    4.

  4. This step verifies that the seat adjuster memory module is supplying the reference voltage to the seat adjuster switch.

    5.

  5. This step replaces a defective seat adjuster switch.

    6.

  6. This step replaces a defective seat adjuster memory module.

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Seat Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Turn the ignition and start switch to the OFF position.
  2. Install the scan tool.
  3. Turn the ignition and start switch to the RUN position.
  4. Using the scan tool, clear the DTCs. Refer to Diagnostic Trouble Code (DTC) Clearing .
  5. Operate the seat adjuster memory module controls.

Does DTC B3792 reset?

--

Go to Step 3

Go to Diagnostic System Check - Power Seat Systems

3

  1. Disconnect the seat adjuster memory module and the seat adjuster switch.
  2. Test the following seat adjuster switch circuits for an open:
    3. • CKT 1522 (TAN)
    • CKT 1523 (LT GRN)
    • CKT 1518 (DK GRN)
    • CKT 1520 (DK BLU)
    • CKT 1519 (YEL)
    • CKT 1521 (LT BLU)
    • CKT 1269 (GRY/BLK)
    • CKT 1270 (DK GRN/WHT)

Refer to Circuit Testing and Wiring Repairs in wiring systems.

Did you find and correct the condition?

--

Go to Diagnostic System Check - Power Seat Systems

Go to Step 4

4

  1. Disconnect the seat adjuster memory module.
  2. Test the following seat adjuster switch circuits for a short to ground:
    3. • CKT 1522 (TAN)
    • CKT 1523 (LT GRN)
    • CKT 1518 (DK GRN)
    • CKT 1520 (DK BLU)
    • CKT 1519 (YEL)
    • CKT 1521 (LT BLU)
    • CKT 1269 (GRY/BLK)
    • CKT 1270 (DK GRN/WHT)

Refer to Circuit Testing and Wiring Repairs in wiring systems.

Did you find and correct the condition?

--

Go to Diagnostic System Check - Power Seat Systems

Go to Step 5

5

  1. Reconnect the seat adjuster memory module connector.
  2. Disconnect the seat adjuster switch.
  3. Test the following seat adjuster switch circuits for voltage:
    4. • CKT 1522 (TAN)
    • CKT 1523 (LT GRN)
    • CKT 1518 (DK GRN)
    • CKT 1520 (DK BLU)
    • CKT 1519 (YEL)
    • CKT 1521 (LT BLU)
    • CKT 1269 (GRY/BLK)
    • CKT 1270 (DK GRN/WHT)

Refer to Circuit Testing in wiring systems.

Does the voltage equal the specified value?

B+

Go to Step 6

Go to Step 7

6

  1. Replace the seat adjuster switch. Refer to Power Seat Switch Replacement .
  2. Clear the DTCs.

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

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7

Replace the seat adjuster memory module. Refer to Memory Seat Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Power Seat Systems

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