Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS, PRESS RIGHT STEERING WHEEL SWITCHES, AND CHECK FOR DTC TO RETURN
NOTE:
Before proceeding with the diagnostic procedure, verify that the connections are properly made, seated and verify proper pin terminal tension. A loose connection at any of the SCM connectors may cause the DTC to set.
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Press one of the Right Steering Wheel (Speed Control) Switches, and with the scan tool, read SCCM DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
8. With the scan tool, read DTCs.
Did the DTC return?

Yes
- Go To 2
No
- Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .

CHECK THE CRUISE CONTROL INPUT 1 VOLTAGE WITH THE SCAN TOOL

With the scan tool, navigate to SCCM, Data Display.

While monitoring the Cruise Control Input 1 voltage with the scan tool, press each Speed Control switch. Compare the scan tool voltage readings with the table below.

RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH) SCAN TOOL VOLTAGE READINGS (AS READ IN SCCM DATA DISPLAY)
	CRUISE BUTTONS RELEASED	ON/OFF	RES +	SET -	CANCEL
Cruise Control Input 1 Voltage	4.55 volts	0.29 volt	3.31 volts	2.71 volts	0.9 volt

Do the voltages displayed on the scan tool match the voltages in the table?

Yes

Visually and physically inspect the wiring harness between the Right Steering Wheel Switch (Speed Control Switch) harness connector and the SCM C5 harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, test complete.
Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

Replace the Right Steering Wheel Switch (Speed Control Switch) in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL AND INSTALLATION .
Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .