1999 Jeep Grand Cherokee Logo
Posted on Mar 08, 2013
Answered by a Fixya Expert

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1999 Grand Cherokee brake lights work when headlights are off but don't work when headlights are on

The rear lights don't come on at all when the headlights are turned on

1 Answer

Anonymous

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  • Expert 84 Answers
  • Posted on Mar 09, 2013
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Headlight switch is what it sounds like.

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Dec 23, 2008

SOURCE: 2002 jeep grand cherokee. Rear left brake light isnt working

The problem with your tail light is the housing is broken where the socket goes in. If you pull that socket out and look you will see the metal tap will be pushed down and the plastic around that will be broke. Easy fix is to replace the lens but you can get under the metal tap with a small flat tip screw driver and pull up on it very lightly and it should work for awhile.

Hope this helps
Cory

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Anonymous

  • 1 Answer
  • Posted on Jan 12, 2009

SOURCE: 2001 jeep grand cherokee lights

The problem is with the connection from the light bulb holder to the socket that the bulb and holder go into. I believe on my 01 JGC it was the top light that was going out when i applied the brakes with the lights on. If you remove the light bulb holder in the tail light assembly and look at the area that the bulb and holder came from either the metal that makes contact with the holder for the bulb is depressed, or in my case it was cracked. You can use a small flat scewdriver to lift the metal in the tail light assembly, or as i did, i just put some tin foil on top of the metal, then reinstalled the bulb and holder ontop of the tin foil (this makes the elec. connection). seems like a rigged up solution, but made sense to me, and worked!

dennymulford

Dennis Mulford

  • 1055 Answers
  • Posted on Apr 18, 2009

SOURCE: Brake Lights 1999 Jeep Grand Cherokee

either the switch or fuse!!!

Anonymous

  • 1 Answer
  • Posted on May 17, 2009

SOURCE: i have a 1999 jeep grand cherokee and the brake lights wont work

there's a possibility that it might be the socket that the bulb actually goes into. my break light did something similar to that. the socket only cost about 8 bucks from the dealer.

Anonymous

  • 1 Answer
  • Posted on Jun 08, 2009

SOURCE: I have a 1999 Jeep Grand Cherokee Laredo - One Brake Light

First, I want to say thank you for the info, you saved me money and aggravation. Second it took mea little while to figure out what contact I was looking for. So I would like to provide a little more detail to make it easier for others in the future.
This is the corrective method for your brake lights not working when your headlights are on(2000 Jeep Cherokee Larado).
1) The cause of the problem is heat from the bulb.
2) Remove the light assembly as if you were going to change a bulb.
3) Turn the socket and remove it from the taillight assembly and set it aside(check to be sure your bulb is not burnt out).
4) Look at the opening, you will see 3 flat chrome colored contacts on the assembly.
5) Notice the one by it self at the top of the opening, that is the "ground".
6) If you look closely you will notice the plastic around the ground contact has shrunk a little bit, this caused the contact to pull away from the socket, causing the problem.
7) With a small flat head screwdriver, VERY GENTLY pry up the contact so it stays slightly upward by itself.
8) Re-insert the bulb assembly back into the housing and press your brake petal with your lights on.
9) You should be in good to go!
10) Tools: Phillips head screwdriver and a small flat head screwdriver.
11) Time : 5 minutes per light

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My first guess would be a ground problem.
The headlights and tail lights are controlled by the same headlight switch, but the brake lights are on a totally different circuit.
You may have to get a shop manual to get the wiring diagrams needed to troubleshoot the circuits if the ground connections are ok.
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/erik_3934b541f17c4e99

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I have a 1999 jeep grand cherokee and the brake lights wont work

there's a possibility that it might be the socket that the bulb actually goes into. my break light did something similar to that. the socket only cost about 8 bucks from the dealer.
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