Cruise Control Malfunction (4-Spoke Steering Wheel)
Cruise Control Malfunction (4-Spoke Steering Wheel)
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 provide 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 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.
Circuit/System Verification
Important: Electromagnetic interference (EMI) on the speed sensor signal circuit may cause erratic cruise control operation.
Engine ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the various cruise control switches. The reading should be toggle between On, Off, Resume and Set accordingly with the depressed switches.
Circuit/System Testing
Important: Repair any brake system related symptoms and DTCs before performing this diagnostic.
1. Ignition OFF, remove the inflatable restraint steering wheel module.
2. Disconnect the harness connector at the steering wheel controls switch - left.
3. Ignition ON, measure for 10 volts or greater between the cruise control switch supply voltage circuit terminal 3 (non UK3) or 5 (UK3) and ground.
• If less than the specified value, test the cruise control switch supply voltage circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the harness connector at the steering wheel controls switch - left.
5. Disconnect the harness connector at the steering wheel controls switch - right.
6. Ignition ON, cruise control ON, measure for 10 volts or greater between the cruise control switch supply voltage circuit terminal 6 (UK3) or 3 (non UK3) and ground.
• If less than the specified value, test the cruise control switch supply voltage circuit for a short to ground or an open/high resistance between the steering wheel controls switch - left and the steering wheel controls switch - right.
7. Ignition OFF, disconnect the harness connector X2 at the BCM.
8. Ignition OFF, test for less than 1.0 ohm of resistance between the steering wheel controls switch - right terminal 4 (non UK3) or 7 (UK3) and the BCM X2 terminal 61.
• If greater than the specified range, test the cruise control switch signal circuit for an open/high resistance.
9. Ignition OFF, test for infinite resistance between the BCM X2 terminal 61 and ground.
• If less than the specified value, test the cruise control switch signal circuit for a short to ground.
10. Connect the harness connector X2 at the BCM.
11. Ignition ON, verify that a test lamp does not illuminate between the cruise control switch signal circuit terminal 4 (non UK3) or 7 (UK3) and ground.
• If the test lamp illuminates, test the cruise control switch signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
12. Test the component. If the circuits and the component tests are normal, replace the ECM.
Component Testing
Steering Wheel Controls - Left
1. Ignition OFF, remove the inflatable restraint steering wheel module.
2. Ignition OFF, disconnect the harness connector at the steering wheel controls - left.
3. Measure the resistance between terminals 5 and 6 (UK3) or 3 and 4 (non UK3) at the cruise control switch side of the connector. Compare the resistance readings to the values for the ON and OFF switch.
• If the resistance measurements for the ON and OFF switch are not within the listed resistance values, replace the steering wheel controls - left switch assembly.
Steering Wheel Controls - Right
1. Ignition OFF, remove the inflatable restraint steering wheel module.
2. Ignition OFF, disconnect the harness connector at the steering wheel controls - right.
3. Measure the resistance between terminals 6 and 7 (UK3) or 3 and 4 (non UK3) 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 SET -, the RES + and the default value.
• If any of the resistance measurements for the - SET, + RES, and the default value are not within the listed resistance values, replace the steering wheel controls - right switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Steering Wheel Control Switch Assembly Replacement