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Virtual Wrench
Virtual Wrench , Olds Mechanic
Category: Oldsmobile
Satisfied Customers: 14592
Experience:  35 years Master Mechanic
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Instrument panel lights do not work in my 1999 Alero

Resolved Question:

I have a 99 Olds Alero. The instrument panel lights do not come on when the headlights come on.

Submitted: 8 years ago.
Category: Oldsmobile
Expert:  Virtual Wrench replied 8 years ago.

Hi,

Are you sure the dimmer control isn't turned all the way down?

Customer: replied 8 years ago.

Yes I checked, that is not the problem.

Expert:  Virtual Wrench replied 8 years ago.

Didn't think so, but you know I had to ask :-)

These vehicles have 3 fuse panels.

Check the fuse in the passenger side fuse panel. See below.

graphicgraphic

Virtual Wrench, Olds Mechanic
Category: Oldsmobile
Satisfied Customers: 14592
Experience: 35 years Master Mechanic
Virtual Wrench and 3 other Oldsmobile Specialists are ready to help you
Customer: replied 8 years ago.

Checked that one. It is ok.

Expert:  Virtual Wrench replied 8 years ago.

Ok. Check this fuse. This is what supplies ground to complete the circuit.

graphic

Customer: replied 8 years ago.

Nope, that is fine too????? This is weird. I checked every fuse well and all the mini fuses. I can't figure this out.

Expert:  Virtual Wrench replied 8 years ago.

That's ok. We are just working our way there. I'm pretty sure the fault lies in the lamp dimmer module (see diagram I sent). I don't have any more information where its at, other than behind left side of dash. If you can find it, I think it will solve this issue.

Customer: replied 8 years ago.

Ok changed the light dimmer switch. That is not it either. That cost me 35.00 bucks and I can't return it.

Expert:  Virtual Wrench replied 8 years ago.

Hi,

Do you have a DVOM to test every single component and wire in that circuit?

If not, we will just be chasing our tails by replacing parts, not good.

Customer: replied 8 years ago.

Yes, I've test lighted everything, fuses, wires going into the dimmer, switch. I can't think of anything else.

Expert:  Virtual Wrench replied 8 years ago.

Thanks, I was referring to a volt/ohm meter, so you could test the resistance in the wiring. It is a tough measurement. Like I initially said, I believe the problem lies in the dimmer MODULE, not the SWITCH. Did you by chance misunderstand me?

Customer: replied 8 years ago.

Yes I guess I did. Ok, so the module I'll try that next.

Expert:  Virtual Wrench replied 8 years ago.

Ouch, I'm just a little concerned though. As there is always a possibility of a broken wire, although unlikely, please don't shoot me if it doesn't work :-)

Customer: replied 8 years ago.

Where is the module located?

Expert:  Virtual Wrench replied 8 years ago.

This is the only thing I have that tells where it is located. You probably are better off just getting the new one, then look under the left side of dash and match it up.

graphic

Maybe this will help....

Instrument Panel Lamp Dimmer Replacement

Removal Procedure

  1. Remove the left sound insulator.
  2. Disconnect the electrical connector.
  3. View Full Image

 

  1. Remove the screws from the dimmer module (1).

Installation Procedure

View Full Image

 

  1. Install the screws to the dimmer module (1).
  2. Connect the electrical connector.
  3. Install the left sound insulator.
Expert:  Virtual Wrench replied 8 years ago.

Hi there, I have been thinking about this some more and now I'm thinking the park lamp relay might be at fault. If you look at this diagram, you will notice that the park lamp relay is what supplies the ground for the dimmer to complete the circuit. Now I'm nervous..

graphic

Customer: replied 8 years ago.

Well I wound up taking it to a mechanic who said it was the cluster cause if you moved the wiring harness around it would work for a few seconds then shut off well. I went out and bought one. Well that was still not it. So then jumped the circut. So now the lights are on anytime. I turn the car on, but atleast they work now.

Expert:  Virtual Wrench replied 8 years ago.

Just for grins, remove the park lamps relay from the under hood fuse box, and find another relay in there that has the same terminal configuration (a lot of them are the same type relay in there) and swap it out and see if it works. I just gotta know..

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