Question about 1995 Jeep Grand Cherokee

2 Answers

Rear Lamp Failure Message

This is driving me nuts! VIC is displaying Rear Lamp Failure. All of my rear lamps
are working. I have verified the correct bulb #'s (OK). Replaced a faulty side
marker light socket. Third Brake Light (2bulbs) is fine. Even replaced the Lamp
Outage Module today (New). Problem seems to be related to the brake and
headlight circuit. During the day there is no message but turn on the headlights
and step on the brake the message pops up. The other day I had the lights in auto
mode and nothing happened until I moved the switch to the manual on position. Any
suggestions on where else to look. I think I will disconnect the battery and see if
that may reset it. I have looked at wiring diagrams until I'm blue in the face, but
don't really see any other possibilities.

Thanks, JW

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  • 3 more comments 
  • Anonymous Mar 07, 2009

    same problem finaly corrected the problem 3rd brake light had one blown bulb

  • Techdvr Mar 19, 2009

    Well it worked for a short time, long enough to drive it into town to have the cooling system flushed. Next day the radiator sprung a leak. I disconnected the battery to replace the radiator and now the Rear Lamp Failure message is back. All the lights are working! Battery cables are clean and tight and I did not touch anything else.

    Techdvr


  • billcwell Mar 21, 2009

    When I had this problem it turned out that one of the bulbs in the center rear break lights was out. This solved the problem for me. There are two bulbs so at first glance it looks as though the bulb was working. Took a bit to get to it but it did solve the problem.



    Bill

  • Techdvr Mar 25, 2009

    Still no success! So far I have installed 6 additional ground wires (#8) to the frame, engine block, firewall and rear inner panel to outer frame. Replaced battery terminals,all exterior bulbs and cleaned sockets.Someone had greased them!!! All lights work, removed VIC and checked circuit boards for bad solder joints, burnt components, etc. no damage noted. Also checked and cleaned front bulbs. When headlights are on there was a 5 second lag before message and none in automatic mode. Now message is instant and also in auto mode. Seems like I'm not making any progress here. Changing LOM modules does not help, guess I'm going to have to replace the VIC module and hope that works, but I expect it probably won't make a difference. This is really getting frustrating as I've probably spent 30 hrs chasing this fault with no success. Could the problem be in the headlight or brake switch? How would the neutral safety switch cause the fault to appear as stated in some other posts? I know the lights are working but to ignore the message if there is a fault and it is ignored then there is the chance of being rear ended.
    Techdvr


  • Richard Scordino May 11, 2010

    Sounds like you covered just about everything. try the battery disconnect and check to make sure the body has a really good ground. Headlights have a lot more draw than daytime lights and that may cause a partial ground to break down. I would really like to spend just one hour with the engineers that thought up this crazy stuff!!! I remember when stuff had wires & switches ... turned them on and stuff worked!!!
    Good luck

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  • Jeep Master
  • 6,982 Answers

So...posting your own solutions now???? OK...Just don't forget
who told you to check all grounds (that means both ends of the cable.) I use additional grounding on all my cars...Run a 10 gauge multi strand wire from the battery to the fender, around to the firewall. Branch there and run through firewall to the dash frame support under the lower lip of the dashboard. The other branch continues to l/f fender, attaching to a point where computer ground wires are, then terminating at the cross-bar that runs above the radiator. To make connections to body, I remove insulation but do not cut wire, just loop it around a bolt & re- tighten, then a squirt of undercoating on each. I normally also add an additional ground to one of the starter bolts. I also remove the original block ground wire and replace it with something along the lines of 00 welding cable.(I have a bunch of it from back when I needed it for re-locating race car batteries to the trunk.)

Posted on Mar 19, 2009

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I think I may have resolved the problem. I disconnected the battery, cleaned the terminals, removed and
cleaned the chassis ground. Rechecked the plug in connections on the LOM. This time when I turned on the lights and activated the brakes no fault message appeared. Tomorrow I'm going to make up some additional
ground cables and install them along the frame to body. XXX Fingers Crossed XXX.
Techvdr...

Posted on Mar 08, 2009

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