B3794
DTC B3794
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC B3794 08
- Cruise Control Function Request Circuit Signal Invalid
DTC B3794 61
- Cruise Control Function Request Circuit Actuator Stuck
Diagnostic Fault Information
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 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.
Conditions for Running the DTC
* The ignition is ON.
* The cruise switch is ON.
Conditions for Setting the DTC
B3794 08
The BCM detects an invalid voltage signal on the cruise control switch signal circuit for 0.5 second.
B3794 61
The BCM detects a valid voltage signal on the cruise control switch signal circuit for greater 60 seconds.
Actions Taken When the DTC Sets
* The malfunction indicator lamp (MIL) will not illuminate.
* The cruise control system is disabled.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Cruise Control Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Cruise Control Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Engine ON, while rotating the steering wheel to both steering stops, 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.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.
• If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 3.
• 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.
4. Ignition OFF, disconnect the X1 harness connector at the BCM.
5. Test for infinite resistance between the signal circuit terminal 3 and ground.
• If less than the specified value, test the signal circuit for a short to ground.
6. If all circuits test normal, test or replace the steering wheel control switch-left.
Component Testing
Important: The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, switches.
Steering Wheel Control Switch - Left (Without K59)
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Connect a DMM between terminals 1 and 3 of the steering wheel controls switch - left.
3. Cruise control switch ON, measure the resistance while individually activation and holding each cruise control function switches and compare the resistance reading to the values in the table for the appropriate switch.
• If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the steering wheel controls switch - left.
Important: The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, Cancel, Gap Up, Gap Down switches.
Steering Wheel Control Switch - Left (With K59)
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Measure the resistance between the voltage reference circuit terminal 1 and the signal circuit terminal 5. Individually activate and hold each gap function switch and compare the resistance reading to the values for the Gap Up, Gap Down, Cancel or the neutral position.
• If any of the resistance measurements for the Gap Up, Gap Down, Cancel or neutral position switches are not within the listed resistance values, replace the steering wheel controls - left.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming