2008 Rubi: M38 Fuse keeps popping - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 10 Old 12-04-2013, 05:26 PM Thread Starter
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2008 Rubi: M38 Fuse keeps popping

Hello all,
I've recently hit an issue with my '08 Rubicon Unlimited. A little background:

So there I was being unmercifully abused in the black Friday shopping crowds when my doors decided that locks were stupid and people should take my things. Please note that I don't enjoy shopping on the punchyest day of the shopping year, but my wife can pinch really hard and gets me to do things.

So anyway, all door locks now become manual, yet the security system continues to go on about it's merry. Meaning that the key fob flashes the lights, the inside switches work to arm the security system, but the door lock motors themselves do not actuate.

I got a chance to look at it this weekend, and fuse M38 was blown. Simple fix, I thought. I put in another fuse which immediately blew, so I assumed there was a short somewhere, maybe a door lock motor was fried. I unplugged all the door connectors and unplugged the rear gat door actuator. When I put in a fuse, it popped again.

There's no obvious breakage or corrosion on any of the connectors, and no other fuses seem to be blowing.

Has anyone had this problem, or any ideas to point me in the right direction?

Thanks in advance,
Jeff
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post #2 of 10 Old 12-04-2013, 05:51 PM
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What is the label for this fuse?


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post #3 of 10 Old 12-04-2013, 06:10 PM Thread Starter
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Quote:
Originally Posted by Goodysgotacuda View Post
What is the label for this fuse?
M38, it's the power door lock motors fuse.
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post #4 of 10 Old 12-05-2013, 12:21 PM
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When you say the fuse immediately blows do mean right when the fuse is inserted or when the door lock/unlock is being activated?


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post #5 of 10 Old 12-05-2013, 12:53 PM
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Have you looked at the actually fuse and made sure it is still good?
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post #6 of 10 Old 12-07-2013, 10:20 AM Thread Starter
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By immediately blowing, I mean there's a short and that the fuse begins arcing as you insert it. If I disconnect the battery and insert a fuse, it blows as soon as the battery terminals contact.

I'm sure the fuse is blown, I've blown another 3x 25A fuses troubleshooting.
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post #7 of 10 Old 12-07-2013, 10:31 AM
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sounds like you've had a wire rub itself raw and have a true short. Somebody somewhere should have a wiring diagram for M38's path to show what color wire it is and how it routes to each motor. You didn't screw anything in lately have you? Had a friend mount an amp in his truck once and the mounting screw went right thru a harness, shorting things out.


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post #8 of 10 Old 12-07-2013, 11:32 AM Thread Starter
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That's what I was thinking, either a short in the harness, or in the TIPM. This is the only thing not working, so if it was a popped transistor or short in the TIPM there'd be a lot more weird things not working.

I haven't installed or screwed anything in since I've owned it. The last thing I touched was cleaning the MAP sensor. I'm an engineer by profession and I'm aware of the sneaky things we do as far as cost reduction, but that'd be a feat to tie off engine components like that. ;-)
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post #9 of 10 Old 12-26-2013, 06:02 AM
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Mine just started the exact same thing yesterday, have you been able to determine the fix?
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post #10 of 10 Old 01-10-2014, 02:43 PM
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Replaced the TIPM and door locks work again, must have been a relay shorted to ground inside the TIPM.
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