This is a continuation of my other thread regarding adding auto dimming rear view mirror with compass and integrated map lights (from a Chevy HHR)
www.toyotanation.com
That project as a whole went relatively well and I got all the desired functionality (no OnStar).
The issue is as follows:
I tapped into the tail light fuse for the map lights (constant power from battery) and tapped into the AC fuse for powering the auto dimming mirror+compass.
After I plugged everything back in, I do NOT have any of the items on the tail light fuse circuit (no cluster lights, no parking lights, no tail lights).
Things I have checked:
Is my location of grounding causing an issue?
The blue circle is the ground screw where heated seats are and the red circle is the ground screw where the mirror is grounded. Any advise on what else is connected to that ground screw?
Please help!!!

Adding auto dimming mirror
Has anyone over here done conversion to an auto dimming mirror? I have the S trim (‘05) and it has the manual day/night with the integrated map lights. So I’m assuming this swap to auto dimming mirror shouldn’t be hard? I found one with integrated map lights as well and it has 3 wires.
That project as a whole went relatively well and I got all the desired functionality (no OnStar).
The issue is as follows:
I tapped into the tail light fuse for the map lights (constant power from battery) and tapped into the AC fuse for powering the auto dimming mirror+compass.
After I plugged everything back in, I do NOT have any of the items on the tail light fuse circuit (no cluster lights, no parking lights, no tail lights).
Things I have checked:
- Removed the fuse tap for the tail light fuse and switched to a new 15A fuse -> no change
- Things I verified that work ->
- High and low beams
- All 4 flashers/hazard/turn lights
- Brake lights
- Reverse lights
- Fog lights
- DRL/Auto headlights
- Power windows
- AC blower/heater and AC compressor
- Rear de-frost
- Horn (yes, BOTH of them work!)
- Remote lock/unlock
- Heated seats! (which are tapped into the cigarette lighter and washer fuses)
- 12v/cigarette lighter
- The dimmer switch "works" : I can get the dome light to turn on/off using the dimmer switch.
- Wipers/windshield washer
- Idiot lights all come on
- I saw a video online of a dude having a 2004 Matrix and he showed his car having 4 relays tucked away behind the glove box (I only found 3 relays - 1 big square one and 2 small ones -> I have spare smaller relays and it made no difference. I don't have a spare relay to swap out the bigger square one). None of the relays showed outwards damage of thermal/heat damage (red circle shows the spot of the big square relay).
- Anyone know what these relays are?
- There are also relays above the under dash fuse box. Could any of those be causing this issue?
- Verified that the 100A alternator fuse is also fine
Is my location of grounding causing an issue?
The blue circle is the ground screw where heated seats are and the red circle is the ground screw where the mirror is grounded. Any advise on what else is connected to that ground screw?
Please help!!!