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Ask GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience:  GM Grand Master Technician 2007. 11 years experience.
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1999 Chevy Suburban: lamps..doors open..lamp control module..assy

Resolved Question:

1999 Chevy Suburban dome and courtesy lamps do not come on with doors open. They do work with manual switch. A mechanic has replaced the lamp control module and the dome/overide switch assy. I believe the door jamb switches are ok.
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

The module will have those specific wires in it. The colors are important and Must match.
Customer: replied 2 years ago.

is the small gray box with the circuit board inside a different component. The circuit board looks like the lamp control modules I find online. I cannot find a box with the 5 colors you're mentioning. Thanks for the patience.

Expert:  GM Tech (Cam) replied 2 years ago.
Ok, test each for power and see what there is, I will go back and see about the different colors.
Customer: replied 2 years ago.
I get no power to any of the terminals to which the lamp module plugs into
Expert:  GM Tech (Cam) replied 2 years ago.
That's not the lamp module then
Customer: replied 2 years ago.
when I google 99 suburban, lamp control module, the little circuit board inside my gray box is what shows up. Sorry if I'm missing something, thanks for your patience
Expert:  GM Tech (Cam) replied 2 years ago.
Do any get ground with the door open?
Customer: replied 2 years ago.

yes, the black, green, one of two brown wires, the yellow, and a pink all make continuity to ground, they also act as ground to a 12v power source at the lamp switch. There are two light blue wires and one brown which do not get ground

Expert:  GM Tech (Cam) replied 2 years ago.
Which gets ground with the door open?
Customer: replied 2 years ago.
The black, the green w black stripe, one of two tan w white stripe, yellow, pink all get ground
Expert:  GM Tech (Cam) replied 2 years ago.
Which one with which door?
NO white wire at all?
Customer: replied 2 years ago.

all doors open, or all doors shut, same wires get ground

Expert:  GM Tech (Cam) replied 2 years ago.
None of this is making sense. CAn you verify the locaiton in the picutre as the highlighted one?
graphic
Customer: replied 2 years ago.

do I need to remove any heater ducts under the dash or is there something I am missing here? I am going to plug my little circuit back in and continue looking for the original 5 wires. Thanks for sticking with me

Expert:  GM Tech (Cam) replied 2 years ago.
I will help as long as needed.
YOu may need to take the trim of around the lower left dash, but no to the heater duct.
Customer: replied 2 years ago.
I found the remote door lock box on the diagram, and right close by is a small relay box with two orange, one black, and one pink wire, no gray and no white
Expert:  GM Tech (Cam) replied 2 years ago.
I am not sure what to say. Even with the remote door lock box, it should have the gray and white wire in there.
Customer: replied 2 years ago.
ok, I may have misunderstood, there is gray and white wires in the remote door lock box, do I use those?
Expert:  GM Tech (Cam) replied 2 years ago.
Yes, ground the white, what happens?
Does the gray get ground with the doors, any of them open?
Customer: replied 2 years ago.
ok, I've got the drivers door open, when I jumper gray to white the dome lights come on. When I close the door the lights go off. It's finally getting exciting.
Expert:  GM Tech (Cam) replied 2 years ago.
Ok, that confirms the remote control door lock module is bad.
You can jump those if you want or you can install a relay. Which do you choose?
Customer: replied 2 years ago.
when you say relay, you mean the remote control module right? Let's do that.
Expert:  GM Tech (Cam) replied 2 years ago.
No, simple relay that you get from a part store so you don't overload the door jamb switches. Can you get a simple relay and I can tell you how to install.
Customer: replied 2 years ago.
Yes, I'll get it in the morning. Instead of replacing the module, we're going jumper with a two pole relay?
Expert:  GM Tech (Cam) replied 2 years ago.
Correct. Wire it this way.

Get power from an orange wire nearby and put that pin 85. Connect the gray wire to the pin 86. Then get a ground wire that you run from the bracket to pin 30 and the white to 87. This way you are using the gray as a signal to turn the lights on and at 1/4 amp, there is not danger of overloading it.
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience: GM Grand Master Technician 2007. 11 years experience.
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