Question about 1999 Volvo S80

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Cruise control doesn't engage 1999 volvo s80 t6

The cruise light comes on on the dash but when I try to set the speed it doesn't engage. I don't think it is the brake pedal; my abs and stc warning lights are on due to a broken exciter ring on the front left hub (not sure whether the abs module is okay as these warning lights were on when I bought the car). Is there a common problem with these cruise units? Any ideas as to the most likely cause? I appreciate your thoughts!

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  • kirkdewar Dec 27, 2008

    Thanks for your reply. I am going to get my speed sensor ring replaced shortly, and if this cures the abs and stc I'll know if the cruise control works. Thanks again

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According the the owners manual (I have the same car, and the same problem), the cruise control will disengage automatically if wheel slip is sensed. This makes me think that if the ABS isn't working properly, Cruise control and STC will not function either, since it's the ABS's function to detect wheel slip.

Posted on Nov 08, 2012

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Not a volvo mechanic but on most american cars the abs and stc modules are in direct corilation with the cruise even though the cruise is most likely ran from vacume the disengagement is electrical.

Posted on Dec 27, 2008

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Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
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---------------------------------------------------------------------
I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
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    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

    -----------------------------------------
    Please report back, I am curious if that is what it is. Good luck

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