Electrochromatic Mirror Troubleshooting

[andy396]

My mirror quit working. It’s the original compass one. I tested the mirror out of the truck and it works. I put a multimeter on the connector when disconnected from the mirror and get battery voltage. Start the truck, I get 13.x volts at the connector. When I plug in the mirror and read the voltage from the backside of the connector I get 0.5V. When I do the same down at the convenience center for that same circuit I also get 0.5V. Someone please explain to me why the voltage is dropping so dramatically with the mirror plugged in. Btw, I also plugged in another spare mirror I had laying around and get the same thing.

 

[AK49BWL]

Check fuse 4 in the dash fuse box. It may be lightly corroded causing a bad connection.

 

[andy396]

Check fuse 4 in the dash fuse box. It may be lightly corroded causing a bad connection.

Will do, but there’s a bunch of other stuff on that same fuse that you would think I’d be having more than just mirror issues.

 

[AK49BWL]

Yes, true, half of your gauges would be failing as well. Another option is the temperature sensor or the outside mirror electrochromic circuit shorted out, but I don't really think that's likely as it should pop the fuse. Have you pulled and replugged the connector from the convenience center?

 

[andy396]

Have you pulled and replugged the connector from the convenience center?

Yes. I’ll have to look into how that pin is getting fed from the convenience center.