DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B3604 or B3605 | Adjustable Foot Pedal Switch Circuit Short to Battery |
| DTC B3606 | Adjustable Foot Pedal Position Sensor Circuit Short to Battery/Shorted To Ground Or Open |
DIAGNOSTIC CODE INDEX
Diagnostic Starting Point - Adjustable Pedals
Begin adjustable pedal system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information
- The identification of the control modules which command the system.
- The ability of the control modules to communicate through the serial data circuit.
- The identification of any stored DTCs and their status.
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Pedals Forward/Rearward | Memory Seat Module/Special Functions/Pedals | The memory seat module (MSM) activates the adjustable pedal motor when you select Forward or Rearward. The motor should move the pedals in the forward or rearward direction until the it reaches it's end of travel. |
Driver Position Module (DPM)
Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON/Engine OFF | |||
| Battery Voltage Signal | Inputs | Volts | Varies |
| Current | Inputs | Amps | Varies |
| Pedals Horizontal Sensor | Pedals | Volts | 0.0-5.0 Volts |
| Pedals Motor Forward | Pedals | Active/Inactive | Inactive |
| Pedals Motor Rearward | Pedals | Active/Inactive | Inactive |
| Pedals Forward Switch | Pedals | Active/Inactive | Inactive |
| Pedals Rearward Switch | Pedals | Active/Inactive | Inactive |
Memory Seat Module
Diagnostic Instructions
- Perform the «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) prior to using this diagnostic procedure.
- Review «Strategy Based Diagnosis»(ref-278018-S03493196652008012100000) for an overview of the diagnostic approach.
- «Diagnostic Procedure Instructions»(ref-278018-S38264170562008012100000) provides an overview of each diagnostic category.
Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Switch Reference Voltage | 1 | 1 | ||
| Forward Switch Signal | 2 | 2 | B3604 01 | |
| Rearward Switch Signal | 3 | 3 | B3605 01 | |
| Adjustable Pedals Inoperative Adjustable Pedals Forward Inoperative Adjustable Pedals Rearward Inoperative | ||||
DTC B3604 or B3605
Conditions for Running the DTC
System voltage to the memory seat module must be 9-16 volts.
Conditions for Setting the DTC
The forward and rearward switch signal circuits are active at the same time.
Action Taken When the DTC Sets
The adjustable pedals will be disabled.
Conditions for Clearing the DTC
The fault is no longer present.
Circuit/System Testing
- Disconnect the adjustable pedal switch connector.
- Ignition ON, verify that both adjustable pedal switch parameters to the memory seat module are Inactive. If one of the switch parameters is always Active test the affected switch signal circuit for a short to voltage. If the signal circuit tests normal replace the memory seat module.
- If the circuit tests normal replace the adjustable pedal switch.
- Perform the «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) prior to using this diagnostic procedure.
- Review «Strategy Based Diagnosis»(ref-278018-S03493196652008012100000) for an overview of the diagnostic approach.
- «Diagnostic Procedure Instructions»(ref-278018-S38264170562008012100000) provides an overview of each diagnostic category.
System voltage to the memory seat module must be 9-16 volts.
The position sensor input to the memory seat module is not within the 0.45-4.55 volt range.
Memory recall functions will be suspended.
The fault is no longer present.
- Ignition OFF, disconnect the harness connector at the adjustable pedal motor.
- Ignition OFF, test for less than 1.0 ohm of resistance 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 memory seat module.
- 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 memory seat module. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the memory seat module.
- 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 memory seat module.
- Install a 3-amp 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 memory seat module.
- If all circuits test normal, test or replace the adjustable pedal motor.
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the adjustable pedal system. Refer to «Checking Aftermarket Accessories»(ref-278019-S10639375482008012100000) .
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Symptom List
Refer to Adjustable Pedals Inoperative (w/o Memory) or Adjustable Pedals Inoperative (with Memory) .
- Perform the «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) prior to using this diagnostic procedure.
- Review «Strategy Based Diagnosis»(ref-278018-S03493196652008012100000) for an overview of the diagnostic approach.
- «Diagnostic Procedure Instructions»(ref-278018-S38264170562008012100000) provides an overview of each diagnostic category.
- 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: Switch supply circuit Switch signal circuits Motor control circuits
- 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.
- Perform the «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) prior to using this diagnostic procedure.
- Review «Strategy Based Diagnosis»(ref-278018-S03493196652008012100000) for an overview of the diagnostic approach.
- «Diagnostic Procedure Instructions»(ref-278018-S38264170562008012100000) provides an overview of each diagnostic category.
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.