Adjustable Pedals Inoperative with Memory

The adjustable pedals assembly is moved forward or backward by a motor which is fixed to the brake pedal actuator with a drive cable to the accelerator pedal actuator. The adjustable pedals motor is controlled directly by an h-bridge driver circuit within the memory seat module. In an inactive state both of the outputs to the motor are supplied with a low current voltage of approximately 2.0 volts. The memory seat module controls the adjustable pedals motor by applying battery voltage to one of the outputs and ground to the other. The adjustable pedals motor is bidirectional and the direction of the pedal assembly travel is determined by which of the motor control circuits is switched to battery positive voltage while the other is grounded. The adjustable pedals forward and rearward switches are inputs to the memory seat module. The memory seat module supplies the switch assembly with a battery positive reference voltage. When the switch is operated to the forward or rearward direction, battery positive voltage is applied to the forward or rearward switch signal inputs.

Schematic Reference

Adjustable Pedal Schematics

Connector End View Reference

Adjustable Pedal Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Install a scan tool and display the MSM adjustable pedal information.
2. Verify that none of the switches are displayed as Active while in an inactive state.

⇒	If any of the switch inputs are Active, perform the Adjustable Pedal Switch Circuit Test.

3. Verify that the switch inputs are displayed as Active while the switch is pressed.

⇒	If any of the switch inputs remain Inactive while the switch is pressed, perform the Adjustable Pedal Switch Circuit Test.

4. If the switch inputs to the MSM function normal, perform the Motor Control Circuit Test.

Adjustable Pedal Switch Circuit Test

1. Disconnect the adjustable pedal switch connector and verify that neither of the adjuster switch inputs are displayed as Active.

⇒	If either of the switch inputs are displayed as Active, test the affected switch signal circuit for a short to voltage. If the circuit tests normal replace the MSM.

2. Verify that battery voltage is present at the reference voltage circuit terminal 5.

⇒	If battery voltage is not present, test the reference voltage circuit for an open/high resistance. If the circuit tests normal replace the MSM.

3. Connect a fused jumper wire from the reference voltage circuit terminal 5 to each of the switch signal circuit terminals 4 and 6, and verify that the switch inputs are displayed as Active when connected.

⇒	If the switch inputs are not Active with the jumper wire connected, test the affected switch signal circuit for an open/high resistance. If the circuit tests normal replace the MSM.

4. If the circuits test normal replace the adjustable pedal switch.

Motor Control Circuit Test

1. Disconnect the MSM connector C3.
2. Verify that a test lamp illuminates when connected from the high current battery supply circuit terminal 5 to ground.

⇒	If the test lamp does not illuminate, repair the high current battery supply circuit for an open or short to ground.

3. Connect the MSM connector C3 and disconnect the adjustable pedal motor connector.
4. Ignition on, verify that approximately 2 volts are present at the motor control circuit terminals.

⇒	If 2 volts are not present, repair the affected motor control circuit for an open/high resistance. If the circuits test normal replace the MSM.

5. If the circuits test normal replace the brake pedal assembly.

Perform the after completing the diagnostic procedure.

Adjustable Pedals Inoperative w/o Memory

Voltage to the adjustable pedal switch is supplied through the park enable relay while in a de-energized state. The park enable relay is controlled by the body control module (BCM) through a high side drive control circuit and will be energized whenever the ignition is in the accessory, run, or crank positions and the transmission is in reverse or the cruise control is engaged. The adjustable pedals switch controls the adjustable pedals relay by applying battery voltage to one of the coils. In an inactive state both of the relay switch contacts are closed to ground and when one of the relay coils is energized its switch contact is closed to battery voltage.

Schematic Reference

Adjustable Pedal Schematics

Connector End View Reference

Electrical Information Reference

1. Disconnect the left instrument panel (I/P) junction block connector C2.
2. Verify that a test lamp illuminates when connected from the park enable relay supply circuit terminal E2 in the harness connector to ground.

⇒	If the test lamp does not illuminate repair the park enable relay supply circuit for an open or short to ground. If the circuit tests normal and the EAP fuse #73 is open, test the following circuits for a short to ground:

•	Switch supply circuit

•	Switch signal circuits

•	Motor control circuits

3. Disconnect the left I/P junction block connector C1.
4. Connect a DMM from the adjustable pedal switch supply circuit terminal C4 to the forward switch signal circuit in connector C2 terminal G1.
5. Verify less than 1 ohm of resistance while pressing the adjustable pedal forward switch.

⇒	If greater than 1 ohm of resistance test the switch supply and signal circuits for an open or high resistance. If the circuits test normal replace the adjustable pedal switch.

6. Connect a DMM from the adjustable pedal switch supply circuit terminal C4 to the rearward switch signal circuit in connector C2 terminal E1.
7. Verify less than 1 ohm of resistance while pressing the adjustable pedal rearward switch.

⇒	If greater than 1 ohm of resistance test the switch signal circuit for an open or high resistance. If the circuit tests normal replace the adjustable pedal switch.

8. Connect the I/P junction block connectors.
9. Disconnect the adjustable pedal motor connector and connect a test lamp across the control circuit terminals in the harness connector.
10. Verify that the test lamp illuminates when the adjustable pedal switch is pressed in both directions.

⇒	If the test lamp does not illuminate while the switch is pressed in both directions, test the control circuits for an open or high resistance. If the control circuits test normal replace the left I/P junction block.

11. If the circuit tests are normal replace the adjustable pedal motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.