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I am a big fan of driving with cruise, but starting about 8 months ago I started noticing one little problem. Occasionally (once a month or so) the cruise light and the rest of functionality do not turn on after I press the "set" button. 10-20 miles later it usually starts working. The issue comes up only if I haven't used cruise on that trip yet. Once it comes on, it works fine afterwords.
 

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It may be the clock spring contacts under the air bag. There is a diagnostic routine you can use.

WARNING:
THIS TEST IS A KEY ON ENGINE OFF (KOEO) TEST ONLY THAT IS CONDUCTED IN PARK ONLY WITH EMERGENCY BRAKE FULLY ENGAGED.

1. Enter Self-Test Diagnostics by depressing the speed control OFF switch while turning the ignition key ON, ensuring engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST, and SET/ACCEL.

IF THE "ON" SWITCH IS NOT DEPRESSED WITHIN 5 SECONDS AFTER ENTERING THE DIAGNOSTICS MODE, THE MODULE TIMES OUT AND THE PROCEDURE MUST BE STARTED OVER.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

3. A lamp flash with the last button (SET/ACCEL) indicates that the STATIC test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

-- 2 Flashes - BPP defective, circuit is defective, brake applied.

-- 3 Flashes - Deactivator switch is open or circuit defective.

-- 4 Flashes - Vehicle speed out of range.

4. Immediately after the static test has passed, the speed control servo will then perform a dynamic test automatically by actuating the throttle lever from 1 mm to 10 mm of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of actuator cable, proper connection of actuator cable to throttle lever, and ensure throttle returns back to idle position. If improper connection and/or binding or sticking of actuator is observed, go to Symptom Chart.

5. Return ignition switch to the OFF position and proceed to Symptom Chart.
 
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