Dome lights are not turning on when opening the door

Tiny
A1HI
  • MEMBER
  • 1992 CHEVROLET VAN
  • 5.7L
  • V6
  • RWD
  • AUTOMATIC
  • 122,000 MILES
My dome lights do not come on when opening the door. I do not have power to door switch, bulbs good, check fuse box have two grounds. Used a power probe pos to try to activate light. Any suggestion to fix it?
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Saturday, December 3rd, 2016 AT 8:20 PM

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Tiny
CARADIODOC
  • EXPERT
Start by checking at the dome light to see if you have twelve volts on both sides of the bulb. If you do not, we need to work back toward the fuse box. If you do, I will need to dig up a wiring diagram to see if there is a Body Computer involved. If there is, the diagnosis gets a lot more complicated.
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Saturday, December 3rd, 2016 AT 11:16 PM
Tiny
A1HI
  • MEMBER
With the key off no voltage key on 6.5 volts on each side.
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Sunday, December 4th, 2016 AT 9:45 AM
Tiny
CARADIODOC
  • EXPERT
Does the horn work? The horn and the interior lights are on the same fuse. If the horn works okay, the first suspect is the interior light switch, but not all vans use that. It is a dash switch that, when turned off, prevents any interior lights from turning on.

You need to have full battery voltage on one side of each interior bulb. You'll find it on both sides if all the door switches are turned off, meaning all the doors are closed. That 12-volt feed wire is the orange wire. The white wires go to ground through any of the door switches.

As shown on my diagram, some of the overhead interior lights only turn on with their individual switches, and they have their own ground circuits. If the dash switch is defective, those lights also will not work, in addition to the lights that turn on when a door is open.
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Monday, December 5th, 2016 AT 7:40 PM

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