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Cruise Light Stays Illuminated

4/3/2009

I need help with my cruise control. I went to http://www.v8sho.com/SHO/IntermittentCruiseControl.htm

and tried to do the self diag. The directions say to hold OFF while turning key to ON, while in park and E brake on. The CC light should flash once to show that you have entered the diag.

I cannot get it to flash to start the diag. I tried it: holding the OFF before turning the key, tried holding it just as I turned the key, holding it just after turning the key.......All with and without the E brake on.

My issue is that the cruise light comes on and stays on as if the cruise would set but it will not hold speed at all, any speed.

Now, while trying to get into the diag. mode, if I just hit ON at any time the cruise light would come on and stay on, like I was driving down the road and set it. That seems odd to me in the first place.

Any takers on this one???? Can you point me in the right direction?

wwlightning
Thanks
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I looked in the '96 and '97 manual and it is not there. It shows up in the '98 manual.

Paul
 

Self-Test Diagnostics

 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.
  1. 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.

  1. 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:

  1. 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.
  1. Return ignition switch to the OFF position and proceed to Symptom Chart.
 

Symptom Chart

NOTE: Self-Test Diagnostics must be performed before proceeding to Symptom Chart.

 

 

 

Refer to the Electrical and Vacuum Troubleshooting Manual for the connector numbers cited in the pinpoint tests.

Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to perform pinpoint tests.

NOTE: New speed control diagnostic software is available in version 12 or higher for New Generation STAR (NGS) Tester or equivalent 418-F048 (007-00500). When using this software it is necessary to use Speed Control Cable 005-00586 with NGS Tester.

 

 

 

Symptom Chart
Condition Possible Source Action
  • Flash Code 1
  • —
  • Test Passed.
  • Flash Code 1 — No Dynamic Pull at Speed Control Servo
  • Speed control actuator cable.
  • Speed control servo.
  • Flash Code 1 — Speed Control Inoperative
  • Circuitry.
  • Speed control servo.
  • Flash Code 2
  • Brake pedal position (BPP) switch.
  • Circuitry.
  • Speed control servo.
  • Flash Code 3
  • Fuse.
  • Circuitry.
  • Deactivator switch.
  • Speed control servo.
  • Flash Code 4
  • Circuitry.
  • Vehicle speed sensor or anti-lock brake control module (SHO).
  • Speed control servo.
  • Flash Code 5
  • Speed control servo.
  • REPLACE the speed control servo.. PERFORM the Self-Test Diagnostics.
  • Speed Control Inoperative — No Flash Codes
  • Fuse.
 
  • Circuitry.
  • Deactivator switch.
  • Brake pedal position (BPP) switch.
  • Burned out stoplamp bulb.
  • Speed control actuator switches.
  • Vehicle speed sensor or anti-lock brake control module (SHO).
  • Speed control servo.
 
  • Speed Control Indicator Does Not Turn On
  • Circuitry.
  • Instrument cluster.
  • Speed control servo.
  • Speed Control Indicator Does Not Turn Off
  • Circuitry.
  • Speed control servo.
 
  • Instrument cluster.
 
  • COAST Switch Inoperative
  • Speed control actuator switches..
 
  • Speed control servo.
  • Circuitry.
 
  • SET/ACCEL Switch Inoperative
  • Speed control actuator switches..
 
  • Speed control servo.
  • Deactivator switch.
  • Circuitry.
 
  • RESUME Switch Inoperative
  • Speed control actuator switches..
 
  • Speed control servo.
  • Circuitry.
 
  • OFF Switch Inoperative
  • Speed control actuator switches..
 
  • Speed control servo.
  • Circuitry.
 
  • Set Speed Fluctuates
  • Vehicle speed sensor or anti-lock brake control module (SHO).
 
  • Speed control servo.
  • Speed control actuator switches.
  • Circuitry.
  • Loose or binding condition between speed control actuator cable and throttle body.
  • Engine.
 
 

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The servo is part of the actuator unit. You replace the whole unit when going to a 98-99 CC actuator.

Here's how you do the swap:

http://www.v8sho.com/SHO/98-99%20Cruise%20Control%20Actuator%20into%2096-97.htm

Daniel
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I was wondering about what happened to my cruise control since last November and I thought something with the transmission. How I lost the Cruise Control is when I accidentally put the trans in Reverse while I was still moving forward. I was pretty sure the trans was toast when I did that but then I lost the cruise control.

I did this Self-Test Diagnostics and gave me 3 Flashes – Deactivator Switch is open or circuit defective.

I will do further testing with the pinpoint tests and see what else is wrong.

Rene Carlos Cruz

Sterling Heights, MI

98 SF

 

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