GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Blazer - 2WD 🢒 Restraints 🢒 SIR 🢒 DTC B3792

Circuit Description

The seat adjuster switch is supplied a reference circuit by the memory seat module (MSM). When a seat adjuster switch is pressed the circuit is closed and the reference circuit is applied to ground. Closing the circuit to the reference circuit pulls the signal circuit low indicating to the MSM the switch status is now active.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3792 Driver Seat Switch Circuit

Conditions for Setting the DTC

A seat adjuster switch input to the MSM is active for more than 30 seconds.

Action Taken When the DTC Sets
    • The MSM will ignore the switch input for which a current status DTC is set.
    • When the fault is no longer present a history status DTC will be stored, and switch operation will be restored.

Conditions for Clearing the DTC
    • The DTC will be current for as long as the fault is present.
    • When the fault is no longer present the DTC will be a history status code.
    • The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

Test Description

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

  1. Verify that the DTC is current or history by monitoring the switch status for which the code is set.

    2.

  2. Tests the seat adjuster switch for an internal fault.

Step

Action

Yes

No

Schematic Reference: Driver Seat Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Install a scan tool.
  2. With a scan tool, observe the status of each available position of the seat adjuster switch in the memory seat module (MSM) data list.

Does the scan tool display inactive for all switch parameters?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the seat adjuster switch connector.
  2. With a scan tool, observe the seat adjuster switch status.

Does the scan tool display inactive for all switch parameters?

Go to Step 5

Go to Step 4

4

Test the switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect and repair any damage to the seat adjuster switch connector and terminals which may cause the condition. 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 9

Go to Step 7

6

Inspect and repair any damage to the MSM connector and terminals which may cause the condition. 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 9

Go to Step 8

7

Replace the seat adjuster switch. Refer to Power Seat Switch Replacement .

Did you complete the replacement?

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 9

--

9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the system within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK