Cruise Control Malfunction (Without K59)
Cruise Control Malfunction (Without K59)
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 instrument panel module (IPM). The IPM 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 IPM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control switch function from the IPM via a serial data message. The rear integration module (RIM) monitors the cruise cancel switch in order to detect when the driver requested to cancel cruise control. The ECM receives the cruise cancel request from the RIM via a serial data message.
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 (Adaptive Cruise Control) (Cruise Control (Adaptive Cruise Control))Cruise Control Description and Operation (Conventional Cruise Control) (Cruise Control (Conventional Cruise Control))
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
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 X2 harness connector at the turn signal/multifunction switch.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.
• If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPM.
3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 4.
• 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 IPM.
4. Ignition OFF, disconnect the X3 harness connector at the IPM.
5. Test for infinite resistance between the signal circuit terminal 20 and ground.
• If less than the specified value, test the signal circuit for a short to ground.
6. If all circuits test normal, test or replace the turn signal/multifunction switch.
Component Testing
Important: The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, Cancel, Gap Up, Gap Down switches.
Turn Signal/Multifunction Switch
1. Ignition OFF, disconnect the X2 harness connector at the turn signal/multifunction switch.
2. Connect a DMM between terminal 1 and terminal 4 at the turn signal/multifunction switch.
3. Cruise control switch ON, measure the resistance while individually activation and holding each cruise control function switches and compare the resistance reading to the values in the table for the appropriate switch.
• If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the turn signal/multifunction switch.
Important: The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, Cancel, Gap Up, Gap Down switches.
Steering Wheel Control Switch - Left
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Measure the resistance between the voltage reference circuit terminal 1 and the signal circuit terminal 2. Individually activate and hold each gap function switch and compare the resistance reading to the values for the Gap Up, Gap Down, Cancel or the neutral position.
• If any of the resistance measurements for the Gap Up, Gap Down, Cancel or neutral position switches are not within the listed resistance values, replace the steering wheel controls - left.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Turn Signal Multifunction Switch Replacement (Service and Repair)
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for IPM replacement, setup, and programming