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LED High Mount Stop Light (CHMSL)

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#11

10-12-2011, 04:05 PM

steak59

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Quote:

Originally Posted by jpx7777

I'm really hesitant about putting a 20-amp fuse in there. From what I do remember from the wiring diagram is that this circuit flows through the BCM. It is very interesting that the fuse does not blow immediately, so it is probably not a dead short, but the fact that the side brake lights don't work until you turn on the key is perplexing.

The M1 fuse feeds the brake switch, then goes to the 3rd brake light, then to the TIPM/BCM. Power is always ON for M1 fuse.
And then there is the M37 fuse, it only comes to live with Key ON, which ALSO goes to brake switch. However, this fuse is used more for Signal instead of direct power. It provides the Signal to the TIPM/bcm you are pressing ON the brake, so it turns on the Left and Right brake light.
BCM has no direct control on 3rd brake light, hence if the M1 fuse blows, it would no light up.

here is Another thing you can do,
Pry this piece off, disconnect the 3rd brake light for a few days, and see if the fuse blows.

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#12

10-12-2011, 05:50 PM

Tizzy1

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just looking at the wiring diagram for the chmsl and the M1 fuse is supposed to be a 20 amp fuse, at least so say's my service manual.

M1 - 20A - A108 18LG/RD - FUSED B(+)

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#13

04-04-2021, 08:38 AM

Red509

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Hi, I am having this same issue on my 2015 grand caravan and was wondering if you ever figured it out what the problem was???

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#14

04-06-2021, 03:02 PM

DodgeCares

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Quote:

Originally Posted by Red509

Hi, I am having this same issue on my 2015 grand caravan and was wondering if you ever figured it out what the problem was???

Hi Red509, Sorry to hear you are experiencing this, we certainly understand why this would be concerning. If you end up addressing this with your local dealer, please let us know via PM. We'd be more than happy to provide you with an additional layer of assistance for that process.

Rob
Dodge Cares

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