New heated side mirror but still drains battery


Asked by Nov 14, 2015 at 03:40 PM about the 2004 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

Bought a 2004 Jeep Grand Cherokee and found out the hard way the driver
side mirror remained on as long as the battery was connected.  Bough and
installed a new mirror thinking it was a short in the original but when I plugged
in the new one it did the same thing.  It began to heat up with the defog button
off until I unplug it or disconnect the battery. Any ideas on my next step?

3 Answers


Your rear defogger a both mirrors warm up together. The problem is going to be in the defogger circuit. Sounds like a stuck relay or possibly a module of some kind has failed. Removing the defogger fuse should prevent the battery from being drained until you can isolate and fix it. HTH. -Jim


Thanks Jim. I will look for the relay/fuse first but would that allow only one mirror to malfunction like that? Very odd but i suppose anything is possible right? Thanks again. Bill

1 out of 1 people think this is helpful.

If you're sure that it's just the 1 mirror, I'd look at the wiring inside that door. Especially where the wiring leaves the door and goes to the main body of the vehicle at the door jam. These wires are prone to wear and breakage because each time the door is opened and closed they move and flex. You may have 2 broken wires touching each other. Something like the wire for the power locks, which is "hot" even when the ignition key is off may be touching the power wire for the mirror heater. HTH. -Jim

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