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Re: Cruise control inop. 98 Lumina LTZ 3800
Also check the third (CHMSL) brake lamp. If the PCM does not detect 0V in the circuit, the cruise will not operate. Since there is a couple mA tickle current from the PCM to test this, if the lamp filament is not intact it will not pull down this voltage to 0, and the problem occurs. This is sensed on the white wire from the cruise control module.
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