B3794
DTC B3794
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy 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 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.
Conditions for Running the DTC
* The ignition is ON.
* The cruise switch is ON.
Conditions for Setting the DTC
DTC B3794 08
The BCM detects an invalid voltage signal on the cruise control switch signal circuit is present for 0.5 second.
DTC B3794 61
The BCM detects an valid voltage signal on the cruise control switch signal circuit is present for greater 60 seconds.
Action Taken When the DTC Sets
* 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.
Conditions for Clearing the DTC
* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 100 malfunction-free warm-up cycles.
Reference Information
Schematic Reference
* Cruise Control Schematics (Electrical Diagrams)
* Steering Wheel Secondary/Configurable Control Schematics (Steering Wheel Secondary/Configurable Control Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Cruise Control Description and Operation (Conventional Cruise Control) (Cruise Control Description and Operation (Conventional Cruise Control))Cruise Control Description and Operation (Adaptive Cruise Control) (Cruise Control Description and Operation (Adaptive Cruise Control))
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
Programming and Relearning (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM. While pressing each of the cruise control switches, the scan tool display should change to display the current switch being actuated.
Circuit/System Testing
1. With the ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement (Service and Repair) .
2. Disconnect the harness connector at the cruise control switch.
3. Ignition ON, test for greater than 10 volts between the supply circuit terminal 1 and ground.
• If less than the specified range, test the supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
4. Verify the scan tool Cruise Control Switch parameter is OFF.
• If not the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the BCM.
5. Ignition OFF, connect the harness connector at the cruise control switch.
6. Ignition ON, cruise control switch ON, observe the scan tool Cruise Control Switch parameter. The parameter should display ON.
• If not the specified value, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the cruise control switch.
7. Observe the scan tool Cruise Control Switch parameter while pressing the RES + portion of the cruise control switch. The parameter should display Resume.
• If not the specified value, test or replace the cruise control switch.
8. Observe the scan tool Cruise Control Switch parameter while pressing the SET - portion of the cruise control switch. The parameter should display Set.
• If not the specified value, test or replace the cruise control switch.
9. Observe the scan tool Cruise Control Switch parameter while pressing the Cancel portion of the cruise control switch. The parameter should display Cancel.
• If not the specified value, test or replace the cruise control switch.
10. If all circuits and the component test normal, replace the BCM.
Component Testing
Important: The cruise control switch must be ON in order to properly measure the resistance of the - /SET, the +/RES, and the Cancel switches.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement (Service and Repair) .
2. Remove the steering wheel cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement (Service and Repair) .
3. Connect a DMM between terminals 1 and 3 of the cruise control switch. Cruise control ON/OFF switch ON, measure the resistance while individually activating and holding each cruise control function switch 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 listed resistance values, replace the cruise control switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Programming and Relearning (Programming and Relearning) for BCM replacement, setup, and programming