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Thread: Electrical Gurus needed

  1. #1
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    Electrical Gurus needed

    Have a 2003 Pontiac Montana, the battery was being drained (constant draw when van is off, until battery is dead, usually overnight). I put a meter on it and pulled fuses from under hood fuses/relays until I found which circuit it was, started pulling inside fuses and watching voltage until I found the culprit. It is fuse 31 labeled "CLUSTER BATT" and according to manual it controls
    Module/Electronic Brake Control
    Module/Electronic Brake Traction
    Control Module (EBCM/EBTCM)

    also when started without this fuse cluster gauges don't work and radio is "theft locked".

    What is my next step to troubleshoot this? I just have the fuse out for now, so van runs great except for the no gauges and radio thing (wife doesn't like driving it like that). Traction control and anti-lock brakes still seem to work without fuse too.

    Any help would be much appreciated.

    Thx, Jay

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    C.C. should be all over this when he see's it, he's the GM guru
    Strength is nothing more than how well you hide the pain

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    When I look it up in ShopKey, "Cluster/Batt Fuse" is a 10A. It feeds the cluster directly, through an orange wire. There are no branch circuits from it on my power distribution diagrams, and it certainly doesn't control the ABS.

    The wire terminates in connector C2, which is Cluster-2, in PIN14, beside a Light Blue wire. I recommend you remove the instrument panel, and disconnect C2. Remove the fuse if you've inserted it. Check for ground on C2 Pin14, it should not exist. If it does, you have an unintentional ground and we'll have to diagnose it. If ground does not exist, reinsert the fuse and check for draw with the cluster disconnected. If draw is eliminated, you have an internal short in the cluster itself (seen it a few times). The cluster will have to be replaced. If the draw still exists, there are other circuits that I'm not aware of and must continue investigating.

    Good luck!
    ....-Noltz
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    Thanks Notlz! I'll continue with that and see what happens, I'll let you know.

    Thanks again, J

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    K....got cluster out, checked for ground on C2 Pin14, no ground that's good, plugged fuse back in and checked for draw..none. BUT... I plugged cluster back in and didn't see draw again either?? I'll check it again tonight, but looks to be the cluster.

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    GM radio's, short all the time and kill batteries...try unplug the radio and for draw...

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    Left the cluster plugged in for a few hours last night and the draw is definitely still there. Where to next? any troubleshooting on the cluster board? or just replacement? Any idea where to get one (other than dealer), I tried Mike's Auto Yard, and no luck.

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    does the draw stay gone with the cluster disconnected, if so looks like the culprit. i have had 2 impala's with the same circuit draw that turned out to be the bcm.

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    If you're disconnecting the cluster and the draw is eliminated, then it's definately in the cluster. You can call around. Dynnomite works for Standard

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    For an intermittent fix, you could install a toggle switch on the line. Switch it off when you get out.

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    I don't know what you guys are talking about...... GM's have NEVER had cluster problems.... :rolleyes:
    What can I say, I'm Skitarded...

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    And never U-vans. :rolleyes: (put a cluster in it)

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    Heres how I'd do it, that is, if you have any crazy wiring skill.. yeap, im diggin on old topics..

    Wire in a relay thats powered off the ignition, then closes the circuit of that fuse... bam, problem solved.. disconnected when its off, connected when its on..
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    Quote Originally Posted by theTravman View Post
    Heres how I'd do it, that is, if you have any crazy wiring skill.. yeap, im diggin on old topics..

    Wire in a relay thats powered off the ignition, then closes the circuit of that fuse... bam, problem solved.. disconnected when its off, connected when its on..
    now there is a bandaid from a future electrical engineer
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    I like it and might just be doing that, I currently still have the cluster unplugged. I can't get one at the wreckers and the dealer wants too much $$, so I think I might go with this hack...uh fix

    Thx,
    J

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