Cruise Control Inoperative/Malfunctioning
Cruise Control Inoperative/Malfunctioning
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 body control module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control 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 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 Fuel Pump and Level Sensor Assembly
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 Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X3 harness connector at the K9 Body Control Module.
4. Disconnect the harness connector at the S78 Turn Signal/Multifunction Switch.
5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 6 and ground.
• If test lamp does not illuminate, test circuit for a short to ground or an open/high resistance.
6. Test for less than 1 V between the signal circuit terminal 5 and ground.
• If greater than the specified range test the signal circuit for a short to voltage. If the circuit tests normal replace the K9 Body Control Module.
7. Ignition OFF, test for 250-750 ohms between the signal circuit terminal 5 and ground.
• If less than the specified range test the signal circuit for a short to ground. If the circuit tests normal replace the K9 Body Control Module.
• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal replace the K9 Body Control Module.
8. If all circuits test normal, test or replace the S78 Turn Signal/Multifunction Switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Turn Signal Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming