Question about 1990 Pontiac Trans Sport
The interior light and ignition can not be related. Just coincidence.
The interior light has a 3 position switch, off, on with door switches, and on all the time. So either a door switch is shorted on, or the switch by the lamp is shorted to the always on position.
The ignition is weird but easily diagnosed. First check that the ignition switch itself turns on and off, by using a test light.
If that is normal, then take out the ignition control unit and have a place like Autozone test it. It has a relay the ignition switch is supposed to turn on and off, and it could stick on, even after switch is off.
Posted on Sep 02, 2010
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Posted on Jan 02, 2017
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