B3794

DTC B3794

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC B3794 08 Cruise Control Function Request Circuit Signal Invalid.
DTC B3794 61 Cruise Control Function Request Circuit Actuator Stuck.

Diagnostic Fault Information:

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 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.
^ The above condition is present for 0.5 second.

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 40 malfunction-free warm-up cycles.

Reference Information

Schematic Reference
[Cruise Control Schematics]

Connector End View Reference
[Cruise Control Connector End Views]

Description and Operation
[Cruise Control Description and Operation]

Electrical Information Reference
^ [Circuit Testing]
^ [Connector Repairs]
^ [Testing for Intermittent Conditions and Poor Connections]
^ [Wiring Repairs]

Scan Tool Reference
^ [Scan Tool Data List - Cruise Control]
^ [Scan Tool Data Definitions (Disengage History) - Cruise Control]

Circuit/System Verification
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.

Circuit/System Testing
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 steering wheel controls switch left.
3. Ignition ON, test for 10 volts or greater between the steering wheel control supply voltage circuit terminal 1 and ground.
^ 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.

4. Ignition ON, verify that a test lamp illuminates between B+ and the cruise control switch signal circuit terminal 3.
^ 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.

5. Ignition OFF, disconnect the harness connector C1 at the BCM.
6. Measure for 0 volts between the cruise control switch signal circuit terminal 3 and ground.
^ If greater than the specified value, test the cruise control switch signal circuit for a short to voltage.

7. If all circuits test normal, test the component. If the circuits and the component tests are normal, replace the BCM.

Component Testing

NOTE: 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.

Steering Wheel Controls Switch - Left




1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to [Inflatable Restraint Steering Wheel Module Replacement].
2. Ignition OFF, disconnect the steering wheel controls switch - left.
3. Cruise switch ON, measure the resistance between terminals 1 and 3 at the cruise control switch side of the connector. Individually activate and hold each cruise control function switch and compare the resistance reading to the values on the schematic for the ON/OFF, 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.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information].
^ [Steering Wheel Control Switch Assembly Replacement]
^ [Control Module References] for BCM replacement, setup, and programming Programming and Relearning