The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when a cruise control function has been requested. The ECM detects a specific voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit when a cruise control function switch is activated, with each switch having a different predetermined voltage value.

This DTC sets if the ECM detects that the voltage on the cruise control set/coast and resume/accelerate switch signal circuit is 3.5 volts or above for greater than 2 seconds.

Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise On/Off Switch, Cruise Resume/Accel Switch and Cruise Set/Coast Switch parameters in the ECM Cruise Control data list. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. Disconnect the harness connector at the cruise control switch assembly.
3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit terminal 1.

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

4. Ignition ON, measure for 10 volts or greater between B+ and the cruise control switch signal circuit terminal 5.

⇒	If less than the specified range, test the cruise control switch signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM.

5. Ignition OFF, disconnect the harness connector C1 at the ECM.
6. Measure for 0 volts between B+ and the cruise control switch signal circuit terminal 5.

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

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

Important: The cruise control switch must be ON in order to properly measure the resistance of the set/cruise and the resume/accel switches.

1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. Disconnect the harness connector at the cruise control switch.
3. Cruise control switch ON, measure the resistance between terminals 1 and 5 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/cruise, and the resume/accel.

⇒	If any of the resistance measurements for the OFF, ON, set/cruise, resume/accel are not within the listed resistance values, replace the cruise control switch assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.