B3794

DTC B3794

Circuit Description

The cruise control switch is an input to the instrument panel module (IPM). The IPM monitors the cruise control set/coast and resume/accel switch signal circuit in order to detect when the driver has requested a cruise control switch function. The IPM detects a predetermined voltage signal on the cruise control set/coast and resume/accel switch signal circuit indicating which cruise control switch function is being requested by the driver. The engine control module (ECM) receives the requested cruise control switch function via the GMLAN serial data signal circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3794 Cruise Control Function Request Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC symptoms, refer to DTC Symptom Description. DTC Symptom Description






Conditions for Running the DTC

* The cruise control on/off switch is ON.
* The ignition is ON.

Conditions for Setting the DTC

The IPM will set DTC B3794 when one of the following conditions are present:

B3794 01

The IPM detects a high voltage signal on the cruise control set/coast and resume/accel switch signal circuit for greater than 5 seconds.

B3794 08

The IPM detects an invalid voltage signal on the cruise control set/coast and resume/accel switch signal circuit.

B3794 59

The IPM detects a voltage signal on the cruise control set/coast and resume/accel switch signal circuit for greater than 60 seconds.

Action Taken When the DTC Sets

* The IPM 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 fault is no longer present.
* A History DTC clears after 50 malfunction-free ignition cycles.
* The IPM receives a clear code command from the scan tool.

Diagnostic Aids

The following are the correct switch resistance value ranges and the correct counts that are displayed in the Cruise parameter in the Body and Accessories/Cruise Control/IPM/Inputs data list, when each switch is pressed individually. If no switch is pressed the resistance value should be infinite.





* Ensure that the set/coast or the resume/accel switch is not stuck or sticking in the engaged position.
* For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Test

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