• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Cruise Control Switch Supply Voltage | 1 | B3794 | 1 | B3794 |
Cruise Control Switch Signal | B3794 | B3794 | B0835 | B3794 |
1. Cruise Control Inoperative/Malfunctioning |
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 switch signal circuit when a switch is applied.
• | The ignition is ON. |
• | The cruise switch is ON. |
• | The BCM detects an invalid voltage signal on the cruise control + RES switch, - SET switch and the cancel signal circuit. |
• | The above condition is present for 0.5 second. |
• | The BCM stores the DTC information into memory when the diagnostic runs and fails. |
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The Cruise Control System is disabled. |
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 40 malfunction-free warm-up cycles. |
• | The BCM receives a clear code command from the scan tool. |
Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise Control Switch parameter in the BCM Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.
Cruise Control Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the various cruise control switches. The reading should match accordingly with each depressed switch.
⇒ | If less than 10 volts, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the cruise control switch signal circuit for an open/high resistance. |
⇒ | If less than the specified value, test the cruise control switch signal circuit for a short to ground. |
Important: The cruise control ON/OFF switch must be ON in order to properly measure the resistance of the - SET, the + RES, and the Cancel switches.
⇒ | If any of the resistance measurements for the OFF, ON, - SET, + RES, and Cancel switches are not within the listed resistance values, replace the cruise control switch assembly. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
---|---|---|
OFF | O.L. | O.L. |
ON | 6.5k ohms | 7.0k ohms |
- SET | 2.2k ohms | 2.4k ohms |
+ RES | 3.7k ohms | 3.8k ohms |
Cancel | 1.4k ohms | 1.6k ohms |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |