25th May 2010, 16:33

I have a 99 GMC Suburban. I bought it from a tow yard and everything worked great until the other day the brake lights stopped working. Tail lights, turn signals and reverse lights work, just no brake lights. We checked all fuses and relays, and can't figure out anything... anyone know anything about this??

6th Oct 2010, 18:25

I recently bought a 1999 GMC Suburban 1500 and am glad that I came across it. I am an avid hunter, and was looking for something that had 4X4 so I could take it hunting, and this vehicle has done everything I have asked of it. The only problems I have had so far is that the gas gauge would say full up until there was about a quarter of a tank left, and it would go back down to normal. At the same time, my vehicle also would heat up very quickly. I found out that the intake manifold gaskets were leaking. Both problems were fixed by the dealer with no charge.

25th Oct 2010, 11:51

My 1999 GMC Suburban 1500SL is a great machine - excellent service for 130K - second owner. Program car.

Have had a series of electrical issues however over time. Rear tail light fixture failed at 30K - replaced it with newer/improved sockets. AC/heat control was next to go - easy replacement but parts were $100. Wipers are now intermittent, I have not found the problem. I don't think it's the motor - I get a buzzing noise in the dash. I think a relay or circuit card has failed or is failing.

Also now the interior lights seem to have a mind of their own. They come on at random and run the battery down. I have pulled the fuse for now. Seems like whom ever designed this electrical system came from Jaguar!

Looking for the service manual/electrical schematics - my third suburban - the other two were bullet proof!

16th Nov 2010, 13:23

I have a '99 Suburban. Interior lights either won't go off (after 45 seconds), or come on for no reason when you're not there, and of course you come back to a vehicle with a dead battery. GM obviously knows there's a problem, otherwise why would they include a dome override button? I'm asking the same question everyone else is. What's the fix? And people wonder why people continue to buy imports more and more and more...

26th Jun 2011, 19:30

Hello John.

I have the same problem. Did you ever figure your problem out?


12th Jul 2011, 13:38

99 Sub.. 100,000+ miles - two main issues..

1. Blinkers keep going out. I have replaced the circuit boards, but still happens. Will work fine for day or two, then goes out. Have to open the compartment, jiggle the bulbs, then works again for a day or two, or until I hit a bump in the road. Any suggestions?

2. Every now and then, the security system goes off. Cannot start the car for 30 minutes up to 8 hours. How do I disconnect?

26th Aug 2011, 20:01

My 96 Honda had the same problem, and it turned out to be a bad blinker switch, but on that the blinker and headlights were all together. Had me scratching my head, but it cost us around $300 or so to have it replaced.

11th Sep 2011, 21:50

The switch triggering on a reverse polarity. Have your electrical system diagnosed.

11th Dec 2011, 22:48

Going through that now my friend. I got it running again by changing my fuel pump in the tank. Second one in a year or more. I could hear it running, had pressure, but not the proper psi (65-70?). Changed the fuel pressure regulator also (pain in the butt by the way). Now the idle goes high, low, high, low and dies. TPS or IAC or both I think.

I had an O2 code for a long time and ignored it. Tons of carbon in the injector's intake area under the throttle body and in the throttle body. Cleaned, put back together and the idle is no good. So all said check fuel pressure, regulator, filter, supply return lines. Take a little gas and dump down the throttle. If she fires it's a fuel problem. If she don't fire, it's a spark problem.

22nd Mar 2012, 19:34

I have a 1997 Suburban with a clicking in the dash. It sounds like turn signal, but they work fine. Anyone else have that problem?

19th Sep 2012, 14:03

Have no signal on the right back light and no brake light. I have tried everything I know, and changed everything I could; still no signal or brake light on that side, but all the other lights work on that right side. What could it be?

8th Dec 2012, 15:37

One word "Glowplugs". Test them and change them.

4th Jun 2014, 18:32

I have same problem - turn signal clicking even when not on. Where do you find fixes to all these comments?