Diagnostic Instructions

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	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	B0835	B3794
1. Cruise Control Inoperative/Malfunctioning

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

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise Control Switch parameter in the BCM Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

Scan Tool Reference

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 match accordingly with each depressed switch.

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 control switch assembly - left.
3. Ignition ON, measure for 10 volts or greater between the 12-volt reference circuit terminal 1 and ground.

⇒	If less than 10 volts, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, disconnect the harness connector X1 of the BCM.
5. Ignition OFF, test for 1.0 ohm of resistance or less between the steering wheel control switch assembly - left terminal 3 and the BCM X1 terminal 3.

⇒	If greater than the specified range, test the cruise control switch signal circuit for an open/high resistance.

6. Ignition OFF, test for infinite resistance between the BCM X1 terminal 3 and ground.

⇒	If less than the specified value, test the cruise control switch signal circuit for a short to ground.

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

Component Testing

Important: 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.

1. With the ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. With the ignition OFF, disconnect the harness connector at the steering wheel control switch assembly - left.
3. 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 cruise control switch assembly.

Function Switch	Minimum Resistance Value	Maximum Resistance Value
OFF	O.L.	O.L.
ON	6.5k ohms	7.0k ohms
- SET	2.2k ohms	2.4k ohms
+ RES	3.7k ohms	3.8k ohms
Cancel	1.4k ohms	1.6k ohms

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.