Adjustable Pedals Inoperative w/o Memory
Diagnostic Instructions
Circuit/System Description
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.
Reference Information
Schematic Reference
Adjustable Pedal Schematics
Connector End View Reference
Electrical Information Reference
Circuit/System Testing
- Disconnect the left instrument panel (I/P) junction block connector C2.
- 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: |
- Disconnect the left I/P junction block connector C1.
- Connect a DMM from the adjustable pedal switch supply circuit terminal C4 to the forward switch signal circuit in connector C2 terminal G1.
- 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. |
- Connect a DMM from the adjustable pedal switch supply circuit terminal C4 to the rearward switch signal circuit in connector C2 terminal E1.
- 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. |
- Connect the I/P junction block connectors.
- Disconnect the adjustable pedal motor connector and connect a test lamp across the control circuit terminals in the harness connector.
- 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. |
- If the circuit tests are normal replace the adjustable pedal motor.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Adjustable Pedals Inoperative with Memory
Diagnostic Instructions
Circuit/System Description
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 closed to ground. The memory seat module controls the adjustable pedals motor by applying battery voltage to one of the outputs. 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 remains 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.
Reference Information
Schematic Reference
Adjustable Pedal Schematics
Connector End View Reference
Adjustable Pedal Connector End Views
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Verification
- Install a scan tool and display the MSM adjustable pedal information.
- 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. |
- 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. |
- If the switch inputs to the MSM function normal, perform the Motor Control Circuit Test.
Circuit/System Testing
Adjustable Pedal Switch Circuit Test
- Disconnect the MSM connectors C6 and C7 and verify that none of the adjuster switch inputs are displayed as Active.
⇒ | If any of the switch inputs are Active, replace the MSM. |
- Verify that battery voltage is not present at the affected switch signal circuit terminal while the switch is inactive.
⇒ | If battery voltage is present while the switch is not pressed test the switch signal circuit for a short to voltage. If the circuit tests normal replace the adjustable pedal switch. |
- Verify that battery voltage is present at the affected switch signal circuit terminal while pressing the switch.
⇒ | If battery voltage is not present while the switch is pressed, repair the switch supply circuit for an open/high resistance or short to ground. If the circuit tests normal replace the adjustable pedal switch. |
- If the circuits test normal replace the MSM.
Motor Control Circuit Test
- Disconnect the MSM connector C3.
- 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. |
- Connect the MSM connector C3 and disconnect the adjustable pedal motor connector.
- Connect a test lamp across the motor control circuit terminals.
- Verify that the test lamp illuminates while the adjustable pedal switch is pressed in both directions.
⇒ | If the test lamp does not illuminate, repair the motor control circuits for an open/high resistance or short to ground. If the circuits test normal replace the MSM. |
- If the circuits test normal replace the brake pedal assembly.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.