B3794
DTC B3794
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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
* The BCM detects an invalid voltage signal on the cruise control switch signal circuit is present for 0.5 second.
* 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.
* The BCM receives a clear code command from the scan tool.
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
Caution: Refer to Restraint System Service Precautions.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement.
2. Disconnect the harness connector of the cruise control switch.
3. Ignition ON, measure for 10 volts or greater at the steering wheel control supply voltage circuit.
• If less than 10 volts, check for an open/high resistance or for a short to ground on the cruise control supply voltage circuit.
4. Test for 0 volts at the cruise control switch connector terminal 3.
• If voltage is present, test cruise control switch signal circuit for a short to voltage.
5. Ignition OFF, disconnect the BCM X1 connector. Test for 0 ohms resistance between BCM connector X1 terminal 3 and the cruise control switch connector terminal 3.
• If greater than the specified value, test the cruise control switch signal circuit for an open or high resistance.
6. Test for infinite resistance between the cruise control switch connector terminal 3 and ground.
• If any resistance is measured, test the cruise control switch signal circuit for a short to ground.
7. If all circuits test normal, test the component. If the circuit and the component tests are normal, replace the BCM.
Component Testing
Caution: Refer to Restraint System Service Precautions.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling.
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. With the ignition OFF, remove the inflatable restraint steering wheel module.
2. Remove the steering wheel cruise control switch.
3. Connect a DMM between terminals 1 and 3 at the cruise control switch. 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 after completing the diagnostic procedure. Verification Tests
* Steering Wheel Control Switch Assembly Replacement