Adjustable Pedals Inoperative (with AN3)
Adjustable Pedals Inoperative (with AN3)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
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 memory seat module (MSM) 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 MSM. The MSM supplies the switch assembly with a 12-volt reference. 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 (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Adjustable Pedals Description and Operation (with Memory) (Adjustable Pedals (with Memory))Adjustable Pedals Description and Operation (w/o Memory) (Adjustable Pedals (w/o Memory))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Control Module References) for scan tool information
Circuit/System Verification
1. Verify DTC B3604, B3605, or B3606 is not set.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
2. Ignition ON, observe the scan tool Pedal Forward Switch and Pedal Aft Switch parameters while cycling the adjustable pedal switch between the FWD and RWD position. The appropriate parameter should change between Active and Inactive as commanded.
• If the parameters do not change between the specified values, refer to Adjustable Pedal Switch Circuit Malfunction.
3. Verify the scan tool Pedal Position parameter is between 0.45-4.55 volts.
• If not within the specified range, refer to Adjustable Pedal Position Sensor Circuit Malfunction.
4. Command the adjustable pedals to move forward and rearward. The pedals should move in the commanded direction.
• If the pedals do not move in the commanded direction, refer to Adjustable Pedal Motor Circuit Malfunction.
Circuit/System Testing
Adjustable Pedal Switch Circuit Malfunction
1. Disconnect the harness connector at the adjustable pedal switch.
2. Ignition ON, test for 11.8-12.2 volts between the appropriate 12-volt reference circuit listed below and ground:
* X88/Z88 - terminal 11
* Z75 - terminal 5
• If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
• If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
3. Verify the scan tool Pedal Forward Switch parameter is Inactive.
• If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
* X88/Z88 - terminal 12
* Z75 - terminal 6
4. Verify the scan tool Pedal Aft Switch parameter is Inactive.
• If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
* X88/Z88 - terminal 10
* Z75 - terminal 4
5. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch parameter should be Active.
* X88/Z88 - terminal 12
* Z75 - terminal 6
• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
6. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter should be Active.
* X88/Z88 - terminal 10
* Z75 - terminal 4
• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
7. If all circuits test normal, test or replace the adjustable pedal switch.
Adjustable Pedal Position Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the adjustable pedal motor.
2. Ignition OFF, test for less than 10 ohm between the low reference circuit terminal 3 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Verify the scan tool Pedal Position parameter is less than 0.45 volt.
• If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.
5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 1. Verify the scan tool Pedal Position parameter is greater than 4.55 volts.
• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
6. If all circuits test normal, test or replace the adjustable pedal motor.
Adjustable Pedal Motor Circuit Malfunction
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Connect the X3 harness connector at the MSM and disconnect the harness connector at the electronic adjustable pedal assembly.
4. Ignition ON, test for 1.5-2.5 volts between the control circuit terminals listed below and ground:
* Control circuit terminal 4
* Control circuit terminal 5
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the MSM.
• If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
5. Connect the test lamp between the control circuit terminal 4 and the control circuit terminal 5.
6. Command the adjustable pedals to move forward and rearward. The test lamp should illuminate each time the pedals are commanded to move.
• If the test lamp does not illuminate, replace the MSM.
7. If all circuits test normal, test or replace the electronic adjustable pedal assembly.
Repair Instructions
Perform Diagnostic Repair Verification (Verification Tests) the after completing the diagnostic procedure.
* Accessory Switch Replacement (without RPO SLT) (Accessory Switch Replacement (without RPO SLT))Accessory Switch Replacement (with RPO SLT) (Accessory Switch Replacement (with RPO SLT))
* Brake Pedal Assembly Replacement (Brake Pedal Assembly Replacement)
* Control Module References (Control Module References) for MSM replacement, setup, and programming