• | 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 |
---|---|---|---|---|
BCM B+ Terminal 3 | B3794 08, B1529 00, B3922 00 | B3794 08, B1529 00, B3922 00 | -- | -- |
BCM B+ Terminal 17 | B3794 08, B1529 00, B3922 00 | B3794 08, 1529 00, B3922 00 | -- | -- |
Cruise Control Switch Signal | B3794 08 | B3794 08 | B3794 08 | -- |
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 switches via 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 ECM indicating the status of the cruise control switches.
Cruise Control Description and Operation
Control Module References for scan tool information
Engine ON, 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.
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | 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 BCM. |
⇒ | If the test lamp illuminates, test the signal circuit for a short to ground. If the circuit test normal, replace the BCM. |
⇒ | If not within the specified resistance range, replace the turn signal/multifunction switch. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
---|---|---|
Off | 6.7k Ohms | 6.9k Ohms |
On | 1.4k Ohms | 1.6k Ohms |
- SET | 2.2k Ohms | 2.4k Ohms |
+ RES | 3.6k Ohms | 3.9k Ohms |
Perform the Diagnostic Repair Verification.
• | Control Module References for BCM replacement, setup, and programming. |