DTC B3794. Saturn AURA 2007

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2007 🢒 AURA 🢒 DTC 🢒 DTC B3794

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 provide an overview of each diagnostic category.

DTC Descriptor

DTC B3794 08: Cruise Control Function Request Circuit Signal Invalid

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Cruise Control Switch Supply Voltage	1	B3794	1	B3794
Cruise Control Switch Signal	B3794	B3794	1	B3794
1. Cruise Control Inoperative/Malfunctioning

The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, and resume/accelerate 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 On/Off, + RES switch, and - SET 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.

•	The BCM receives a clear code command from the scan tool.

Reference Information

Schematic Reference

•	Cruise Control Schematics

•	Body Control System Schematics

•	Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

•	Secondary/Configurable Control Connector End Views

•	Data Communication Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Circuit/System Verification

Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the various cruise control switches. The reading should be Error.

⇒	If the Cruise Control Switch parameter toggles between On, Off, Resume, and Set accordingly with the depressed switches, then go to Testing for Intermittent Conditions and Poor Connections .

Go to Circuit/System Testing.

Circuit/System Testing

Caution: Refer to SIR Caution in the Preface section.

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
Disconnect the harness connector of the cruise control switch.
Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit.

⇒	If less than the specified value, check for an open/high resistance or a short to ground on the cruise control supply voltage circuit.

Ignition OFF, test for an open/high resistance, a short to ground, or a short to voltage in the cruise control switch signal circuit.
Test the component. If the circuits and the component tests are normal, replace the BCM.

Component Testing