GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B3604 01: Adjustable Foot Pedal Forward Switch Circuit Short to Battery

DTC B3605 01: Adjustable Foot Pedal Rearward Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

B+

1

1

--

--

Adjustable Pedals Forward Switch Signal

1

1

B3604 01

--

Adjustable Pedals Rearward Switch Signal

1

1

B3605 01

--

1. Adjustable Pedals Malfunction

Circuit/System Description

Battery voltage is supplied at all times to the adjustable pedal switch from the memory seat module (MSM). When the pedals switch is pressed, battery voltage is applied through the switch contacts and the switch signal circuit to the MSM. The MSM then commands the adjustable pedals motor to move in response to the switch signal.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

    • If the adjustable pedals switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.
    • A short to voltage on a switch signal circuit.

Action Taken When the DTC Sets

Adjustable pedals operation will be disabled.

Conditions for Clearing the DTC

    • The current DTC will clear and set the code to history, 3 seconds after the fault is no longer present and the power mode changes to OFF then back to ACC or RUN.
    • The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

The MSM may be referenced as the driver position module.

Reference Information

Schematic Reference

Adjustable Pedal Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Adjustable Pedals Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Pedal Forward Switch and Aft Switch parameters while pressing the adjustable pedal switch in both directions. The readings should change between Inactive and Active for both directions.

Circuit/System Testing

  1. Disconnect the harness connector at the adjustable pedal switch.
  2. Ignition ON, verify that both scan tool Pedal Switch parameters are Inactive.
  3. If not the specified value, test the appropriate switch signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  4. If all circuits tests normal, replace the adjustable pedal switch.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the adjustable pedal switch.
  2. Test for infinite resistance between the signal terminal A and the B+ terminal C with the switch in the open position.
  3. If not the specified value, replace the adjustable pedal switch.
  4. Test for less than 2 ohms between the signal terminal A and the B+ terminal C with the switch in the closed position.
  5. If greater than the specified range, replace the adjustable pedal switch.
  6. Test for infinite resistance between the signal terminal B and the B+ terminal C with the switch in the open position.
  7. If not the specified value, replace the adjustable pedal switch.
  8. Test for less than 2 ohms between the signal terminal B and the B+ terminal C with the switch in the closed position.
  9. If greater than the specified range, replace the adjustable pedal switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Brake and Accelerator Pedal Adjuster Switch Replacement
    •  Control Module References for MSM replacement, setup, and programming