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99 suburban tail lights dont work. All others work fine.

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99 suburban tail lights don't...
99 suburban tail lights don't work. All others work fine. Bulbs look OK
Submitted: 8 years ago.Category: GM
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Answered in 4 minutes by:
5/30/2009
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago
Greg A.
Greg A., Master Troubleshooter
Category: GM
Satisfied Customers: 9,006
Experience: Working with Electronics & Cars for 25+ Years
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Hello & Welcome,

 

Does this mean that the brake lights and the backup lights work, or are they out too?

 

Thanks

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Customer reply replied 8 years ago
Turn signals work, hazard lights work, stop lights work, head lights work. Tail lights don't work with the headlights. I looked at the bulbs and they appeared fine. I switched the taillight bulb with the turn signal bulb and it work in the turn signal spot. I did this for both sides.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

I am so sorry - my wife had a kitchen emergency that I had to take care of.

 

Let me check the schematics and see what I can find.

 

Do you have a test light or multimeter you can use to do some testing?

 

Thanks

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GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago
One other question: Do the license plate lights work?
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Customer reply replied 8 years ago
I don't. The instrument panel light does not work. The light on the A/C recirculation button does not work. The license plate light does not work.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago
How about the front parking light? Do they work?
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Customer reply replied 8 years ago
I assume you mean when I turn the headlight switch to the first position to get parking lights....They don't work. The headlights work and the high beams work.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

OK - Now we are getting somewhere. Most of those lights are driven by the same circuit. Here is the schematic.

 

graphic

 

I have highlighted the fuse and the switch that controls most of the lights.

 

What I would do is check the fuse with a test light or multimeter to see if power is coming into and going out of that fuse. If that is OK, it would be time to check the pins on the headlight switch to see if it is working.

 

If you don't have the test tools, you can just check the fuse visually (look at it) and see if it looks like it is blown.

 

Please let me know what you find.

 

Take Care, Greg A.

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Customer reply replied 8 years ago
It's definitely not the fuse. The fuse also controls the interior lamp and it shut off when the fuse was removed. So you're saying it's the switch?
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

That would be the next suspect. But I could not say without testing. I would recommend that you get a cheap test light or meter (they are only $5-$10) and make sure power is making it into the switch (at pin H of the schematic) and then comes out when the switch is turned on (pin S of the schematic).

 

Please let me know what you find.

 

Take Care, Greg A.

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Customer reply replied 8 years ago
Will do. Tomorrow
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

Sounds like a plan.

 

Please let me know what you find.

 

Take Care, Greg A.

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Customer reply replied 8 years ago

I really think it's the switch. I looked it up online and found that the switch assy is available at the local parts store. I will buy it and see if the new one works. If it doesn't, I'll simply take it back. I'm almost positive this will work.

 

I'll click accept as soon as I find this works.

GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

Hi again,

 

As a quick test, you can carefully put a jumper wire from pin H to S and see if that makes the lights come on.

 

Thanks, XXXXX

Greg A.
Greg A., Master Troubleshooter
Category: GM
Satisfied Customers: 9,006
Experience: Working with Electronics & Cars for 25+ Years
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Customer reply replied 8 years ago
Lights still don't work, even with the switch changed out.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

Hi again,

 

Did you place the jumper wire between the two pins I mentioned above, as a test, before replacing the switch? Did you get a test light or multimeter to do some testing?

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Customer reply replied 8 years ago
No I didn't. I'm at work now and will get a test light on the way home in a few hours.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

Ok - Thanks.

 

You might want to consider an inexpensive multimeter too.

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Customer reply replied 8 years ago
It turned out to be the fuse. #9 as you said before. I really don't get it, because I checked them. I was jumpering across the connector like you said and got no lights, which means it's not the fuse. Then I tried jumpering across other parts on the connector, like an idiot and heard a small pop. I rechecked the fuse and found it blown. I replace the fuse and all now works. Go figure.
GM Mechanic: Greg A., Master Troubleshooter replied 8 years ago

Hi again,

 

A good test light or multimeter comes in pretty handy most times to figure these things out.

 

I am glad you got it worked out and that I could help.

 

Take Care, Greg A.

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