Cruise Control Malfunction
Cruise Control Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Initial Inspection and Diagnostic Overview prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Initial Inspection and Diagnostic Overview for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Initial Inspection and Diagnostic Overview provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The BCM sends a serial data message to the engine control module (ECM), indicating the status of the cruise control switches.
Reference Information
Schematic Reference
Cruise Control Schematics Electrical Diagrams
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 Component Tests and General Diagnostics
* Connector Repairs Component Tests and General Diagnostics
* Testing for Intermittent Conditions and Poor Connections Component Tests and General Diagnostics
* Wiring Repairs Component Tests and General Diagnostics
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Cruise Control Switch parameter while pressing each of the cruise control switches. The parameter should toggle between On, Off, Resume and Set as the applicable switch is pressed.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 7 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.
• If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
4. Test for B+ between the B+ circuit terminal 4 and the signal circuit terminal 5.
• If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
5. Ignition OFF, disconnect the X2 harness connector at the BCM.
6. Test for infinite resistance between the signal circuit terminal 61 and ground.
• If less than the specified value, test the signal circuit for a short to ground.
7. If all circuits test normal, test or replace the steering wheel controls switch - left.
Component Testing
1. Disconnect the harness connector at the turn steering wheel control switch - left.
2. Cruise control switch ON, measure the resistance between terminal 4 and terminal 5 while individually activating and holding each cruise control function switch and compare the resistance reading to the values in the table below.
• If not within the specified resistance range, replace the steering wheel control switch - left.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Steering Wheel Control Switch Assembly Replacement (Cruise Control and Radio Switch)
* Control Module References Programming and Relearning for BCM replacement, setup, and programming