Electrical issues... All red dash, service advancetrac

Discussion in '2011+ Mustang GT 5.0L Tech' started by BEAST, Dec 13, 2018.

  1. BEAST

    BEAST CHEROKEE NOOB HUNTER

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    A week ago I had to drive through some high water (not over mid wheel). No issues for 2 days, leaving for lunch on the 3rd day I get service advancetrac messages but the car seems normal. I drove it home and the light went off when I pulled into my driveway. No issues for 2 more days. Coming into work today in the rain, the service advancetrac pops up then my dash goes all red, all gauges 0 out and every warning light comes on.

    Where do I start? The battery? Chassis connections? I'm fucking lost as of right now. Any help is appreciated
     
  2. Juice

    Juice forum member

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    From the "all guages zero", i suspect a CAN bus issue, the cluster lost communication. Since you also mentioned the heavy rain, I would start with the ABS and PCM C175B connectors. Unplug and check for moisture penetration. If wet, dry them ASAP before any terminals start corroding.
     
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  3. BEAST

    BEAST CHEROKEE NOOB HUNTER

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    More information: just went out and started the car voltage with the car running is 13.9-14.2, battery voltage with the car off and key forward is at 12.0-12.2.

    I don't have a manual to look through, where are the abs and pcm connectors? Are they low on the car? I gotta get this fixed soon, car nearly killed me with the loss of all power today.
     
  4. Juice

    Juice forum member

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    The PCM is next to the under hood fuse box, has 3 connectors. Check all those for water.
    The ABS connector is at the ABS module which has all the brake lines going to it. I "think" it is near the air box, but not sure. (I dont have ABS on mine)
     
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  5. BEAST

    BEAST CHEROKEE NOOB HUNTER

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    Aight bet. I will have to check them at lunch or after work. Can a dead cell in a battery cause these issues? Im almost 100% that it has dropped a cell, also upon further looking, the positive terminal is cracked and the fuse/relays are corroded all to hell.
     
  6. Juice

    Juice forum member

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    Possible, yes. Computers do not react well to unstable circuit voltage.
     
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  7. BEAST

    BEAST CHEROKEE NOOB HUNTER

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    So the issue came back today in the rain. When the issue first started I pulled all harness connectors and cleaned the and applied dielectric grease, replaced the battery and the positive terminal and circuit breaker. Everything seemed fine for, even drove in the rain. Then this morning it's starts it's shit again. I pulled over to shit it off and restart to see if it went away.... Would not restart for 30 min. Got it running and drove it to work with no power steering and my dash looking like I hit the progressive jackpot. 3 miles from work still in a down pour the dash lights up as normal and the power steering comes back. Now I just have the 2 track light and TC off light are on with "Service advanced Trac" warning. IMG_20190103_053109507.jpg IMG_20190103_062109252.jpg IMG_20190103_063442286.jpg 15465500818692537540833298392142.jpg IMG_20190103_053109507.jpg IMG_20190103_062109252.jpg IMG_20190103_063442286.jpg 15465500818692537540833298392142.jpg
     
  8. 46addict

    46addict 13726548

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    Which fuses were corroded? Have you tried a new battery yet to rule out the dead cell?
     
  9. BEAST

    BEAST CHEROKEE NOOB HUNTER

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    The 100 amp on the positive post. I swapped the whole assembly and put in a new battery. Seems to only do it in the rain. Not 30 sec after posting this and getting a pic of the dash it all cleared up again. I'm about to check the grounds that I can find.

    Do you happen to know the resistance value of an abs wheel sensor? That's my next spot to try testing.

    Anyone got links to a schematic for the harness?