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Cruise control not reliable
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Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Tue, 6 Jun 2017 09:15:57 Share Post by Email
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Something about my cruise control ('96 automatic) is on the ragged edge. When it works, it works normally. Most of the time it doesn't work.

Failure mode is like this every time: I start the engine with cruise turned off. Drive away and turn on the cruise control, which illuminates the cruise light on the dash. Driving at cruising speed I press the Set button but the cruise doesn't engage. I turn off cruise control on the stalk, but the cruise indicator light stays on until the next time I start the engine.

I tried replacing the cruise control switch on the brake pedal with a new one. No change. I noticed the right side tail lights were slightly dimmer than the left side and polished the harness contracts so they're now equally bright. No change. By the way the brake light bulbs are the same make and wattage, and the pictogram stays off. For testing purposes I've put rubber bands on the old cruise control switch to hold the plunger all the way in, verified that electrical current flows through the old switch, and connected the 2-wire harness to the old switch. So there is no chance the cruise control switch is telling the cruise system that the brakes are applied. No change.

This is the newer generation cruise control (no vacuum connection) that applies to '95 - '98 model years. Does this failure mode sound familiar to anyone? What should I try next?

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