Cruise Control Inoperative/Malfunctioning
Cruise Control Inoperative/Malfunctioning
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
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 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 set/coast, resume/accelerate and cancel switch signal circuit when a switch is applied.
Conditions for Enabling Cruise Control
* The vehicle speed is greater than 40 km/h (25 mph).
* The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
* The system voltage is within 9-16 volts.
* The park brake or brakes are not applied.
Diagnostic Aids
Important: Repair any brake system related symptoms and DTCs before performing this diagnostic.
Caution: Refer to Restraint System Service Precautions.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling.
In order to avoid misdiagnosis, inspect for the following:
* Ensure that the following cruise control switches are not stuck in the engaged position:
- On/Off switch
- Set/Coast switch
- Resume/Accel switch
- Cancel switch
* With the Cruise On/Off Switch ON, rotate the steering wheel to both steering stops while activating each cruise control switch separately. With a scan tool, observe the Cruise Set/Coast Switch, the Cruise Resume/Accel Switch and the Cruise Cancel Switch parameters in the ECM and the Cruise Control Switch parameter in the BCM. Ensure that each cruise control switch activates and that each displayed switch position parameters match, as the steering wheel is turned.
* Inspect for proper operation of the stop lamps and the braking system.
* Electromagnetic interference (EMI) on the speed sensor signal circuit may cause erratic cruise control operation.
* For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
Circuit/System Verification
Important: The cruise on/off switch must be ON in order to view all of the cruise control parameters properly.
Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the various cruise control switches. The reading should be Error.
If the Cruise Control Switch parameter toggles between On, Off, Resume, Set and Cancel accordingly with the depressed switches, then replace the ECM.
Circuit/System Testing
Important: Repair any brake system related symptoms and DTCs before performing this diagnostic.
Caution: Refer to Restraint System Service Precautions.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement (Equinox) Inflatable Restraint Steering Wheel Module Replacement (Torrent).
2. Disconnect the harness connector of the steering wheel controls switch-left.
3. Ignition ON, measure for 10 volts or greater at the steering wheel control supply voltage circuit.
• If less than the specified value, check for an open/high resistance or a short to ground on the steering wheel control supply voltage circuit.
4. Test the cruise control switch signal circuit for an open/high resistance, a short to ground or a short to voltage.
5. If the circuits test normal, test the component. If the component tests normal, replace the BCM.
Component Testing
Caution: Refer to Restraint System Service Precautions.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement (Equinox) Inflatable Restraint Steering Wheel Module Replacement (Torrent).
2. Ignition OFF, disconnect the harness connector C277 at the inflatable restraint steering wheel module.
3. Measure the resistance between terminals C and D at the cruise control switch side of the connector. Individually activate and hold each cruise control function switch and compare the resistance reading to the values for the On, Off, - SET, + RES and cancel switches.
• If any of the resistance measurements for the On, Off, - SET, + RES and cancel switches are not within the listed resistance values, replace the steering wheel controls-left.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Steering Wheel Control Switch Assembly Replacement (Equinox) Steering Wheel Control Switch Assembly Replacement (Torrent)
* Refer to Programming and Relearning for BCM or ECM setup and programming. Programming and Relearning