The cruise control switches are inputs to the engine control module (ECM) or throttle actuator control (TAC) module (8.1L). The ECM/TAC monitors the cruise control switch signal circuits. The ECM/TAC detects a voltage signal on the cruise control switch signal circuits when the corresponding switch is applied.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Cruise Control Switch parameter while pressing each of the cruise control switches. The parameter should toggle between ON, OFF, Resume, Set, as the applicable switch is pressed.

1. Ignition OFF, disconnect the X201 harness connector at the turn signal/multifunction switch. With the turn signal/multifunction switch harness connectors removed from the column bulkhead connector, reconnect the steering column bulkhead connector X201.
2. Ignition ON, test for B+ between the B+ circuit terminal A13 and ground.

⇒	If less than specified value, test the B+ circuit for a short to ground or an open/high resistance.

3. Install a 3A fused jumper wire between the signal circuit terminal A12 and B+ circuit terminal A13. Verify the scan tool cruise ON/OFF switch parameter displays ON.

⇒	If not in the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM or TAC.

4. Verify the scan tool cruise Set/Coast switch parameter displays Inactive.

⇒	If not the specified value, test the signal circuit terminal A14 for a short to voltage, if the circuit tests normal, replace the ECM or TAC.

5. Verify the scan tool cruise Resume/Accel. switch parameter displays Inactive.

⇒	If not the specified value, test the signal circuit terminal A15 for a short to voltage, If the circuit tests normal, replace the ECM or TAC.

6. Install a 3A fused jumper wire between the signal circuit terminal A14 and B+ circuit terminal A13. Verify the scan tool cruise Set/Coast switch parameter displays Active.

⇒	If not in the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM or TAC.

7. Install a 3A fused jumper wire between the signal circuit terminal A15 and B+ circuit terminal A13. Verify the scan tool cruise Resume/Accel. switch parameter displays Active.

⇒	If not in the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM or TAC.

8. If all circuit tests normal, replace the turn signal/multifunction switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.