• | 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 08 | 1 | B3794 61 |
Cruise Control Switch Signal | B3794 08 | B3794 08 | B0835 00 | B3794 61 |
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 switch 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. |
Cruise Control Connector End Views
Cruise Control Description and Operation
Ignition ON, observe the scan tool Cruise Control Switch parameter while pressing the cruise control switches. The reading should change between On, Off, Resume, Set and Cancel accordingly with the depressed switches.
⇒ | If less than 10 volts, check for an open/high resistance or for a short to ground on the steering wheel control supply voltage circuit. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified value, test the cruise control switch signal circuit for a short to voltage. |
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 steering wheel controls switch - left. |
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 |