My CC dont work. I went looking for some tech data. I found this one through Google, but it wont work on my truck, because My truck, built in 96, dont seem to have a Cruise Control light in the Dash! DRAT!
I'll share it anyway, maybe somebody will see what I'm missing and point me in the right direction. Or have a Tech sheet for my 97.
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"Enter self-test diagnostics by ‘Press n’ hold’ the speed control OFF switch while turning the ignition key ON! Making sure the engine does not start and is not running.
The speed control indicator on the instrument panel will flash once to indicate the speed control module entered the diagnostic mode.
Five additional flashes at this point indicate a defective speed control servo.
Release the OFF switch.

Do this within five seconds after entering the diagnostics mode
Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
(If the ON switch is not depressed within five 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.
NOTE: There will be a slight delay when the last button is pressed and the lamp flashes.

A Speed control indicator 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, CPP switch or jumper (if equipped).
3 flashes - deactivator switch is open or circuit defective.
4 flashes - vehicle speed signal is out of range or circuit is defective
Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position.
During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.

try this and see if the speed control module has any codes in it.