Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B3794: Cruise Control Function Request Circuit Signal InvalidDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition Reference | 1 | B3794 | -- | -- |
Signal | 1 | B3794 | B3794 | -- |
1. Cruise Control Malfunction | ||||
Circuit/System Description
The cruise control switch is an input to the instrument panel cluster (IPC). The IPC monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The IPC detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The IPC sends a serial data message to the engine control module (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
The IPC detects an invalid voltage signal on the cruise control switch signal circuit.
Action Taken When the DTC Sets
The cruise control system is disabled.
Conditions for Clearing the DTC
The current DTC clears when the fault is no longer present.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
Circuit/System Verification
Ignition ON, observe the scan tool Cruise Mode Signal parameter. The reading should be 0.0 V and change when the cruise control switch is turned ON, and while the resume and set switches are pressed.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the cruise control switch.
- Ignition ON, test for 11-13 V between the ignition reference circuit terminal 4 and ground.
- Verify the scan tool Cruise Mode Signal parameter is less than 1 V.
- Install a 3A fused jumper wire between the signal circuit terminal 1 and the ignition reference circuit terminal 4. Verify the scan tool Cruise Mode Signal parameter is greater than 11 V.
- If all circuits test normal, test or replace the cruise control switch.
| ⇒ | If less than the specified range, test the ignition reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC. |
| ⇒ | If greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the IPC. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPC replacement, programming, and setup. |
