Cruise Control Malfunction
Cruise Control Malfunction
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 cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control switch signal circuits in order to detect when a cruise control function switch has been activated. The ECM detects a voltage signal when a cruise control function switch is applied.
Reference Information
Schematic Reference
Cruise Control Schematics ([1][2]Cruise Control)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Cruise Control Description and Operation (Description and Operation)
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 (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, cruise control switch ON, observe the Cruise Set/Coast and Cruise Resume/Accel. Switch parameters while pressing and releasing each switch. The switch parameters should change between Active and Inactive as the switch is pressed and released.
Circuit/System Testing
1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
3. Verify the Cruise Control ON/OFF Switch parameter displays Off.
• If not the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and the ignition voltage circuit terminal A. Verify the Cruise Control ON/OFF Switch parameter displays On.
• 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 ECM.
5. Verify that the scan tool Cruise Set/Coast Switch parameter displays Inactive.
• If not the specified value, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the signal circuit terminal C and the ignition voltage circuit terminal A. Verify the scan tool Cruise Set/Coast Switch parameter displays Active.
• 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 ECM.
7. Verify that the scan tool Cruise Resume/Accel. Switch parameter displays Inactive.
• If not the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM.
8. Install a 3A fused jumper wire between the signal circuit terminal D and the ignition voltage circuit terminal A. Verify the scan tool Cruise Resume/Accel. Switch parameter displays Active.
• 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 ECM.
9. If all circuits test normal, test or replace the turn signal/multifunction switch.
Component Testing
1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
2. Test for infinite resistance between terminal A and terminal B at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
3. Turn the cruise control ON/OFF switch ON. Test for less than 1 ohm between terminal A and terminal B at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
4. Test for infinite resistance between terminals A and C at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
5. Press and hold the Set/Coast switch. Test for less than 1 ohm between terminal A and terminal C at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
6. Test for infinite resistance between terminal A and terminal D at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
7. Press and hold the Resume/Accel. switch. Test for less than 1 ohm between terminal A and terminal D at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming