Electrical Problem

Planned to install a dash-cam under the mirror on my 2016 SR5 5.7 4X4.

Disconnected power plug to mirror thinking I could find 12V to run the camera. Testing for power with volt meter with truck running when shorted between two post with the probes. Plugged mirror back in.

Lost ac/heater controls, electric windows, front grill parking lights, compass, and air bag light in panel stays on.

Engine runs fine, charges OK, headlights/tail lights, turn signals, and electric door locks work fine.

Checked fuses under panel and under hood finding 40A Sub Power fuse blown and replaced it. Tested and still same problem.

Started looking at main fuse block and thought I could see a section of fuse blown, replaced the main fuse block this afternoon and when I got the original main fuse block out for a better look there were not any blown sections, still have same problems.

Thanks,

Here's the blown 40A sub power fuse I replaced:

 

Is there a relay in the circuit? Need a diagram to see the path

 

Ryan,

I don't have a diagram, assume this is a relay and it's also identified as sub power, too. Will see if I can find one today,

Thanks,

 

Removed the relay:

It's a 90080-87026, identified as fuel pump relay on line, but has other applications, too:

Horn Relay, Relay, ECM Relay, Sr, Accessory Power Relay, Fan Relay, Starter Relay



Sub battery fuse that blew on left and sub battery relay on right:



Going to see if a relay can be found at a local dealer today,

Thanks,

 

Yep. That looks like a relay. Hope that works out!

 

When I first caused this problem, pulled/checked every fuse in the cabin fuse box, I missed one, the ECU-IG No2 7.5A fuse. Went to the Toyota dealer and let them run diagnostics this morning.

It blew two fuses, Sub battery 40A fuse in the engine compartment that I found and dealer found the ECU-IG No2 7.5A, too. The dealer also had to re-calibrate the passenger air bag system to turn the air bag light off in the panel, they said this happened when I blew the fuses and the system lost power.

Tundra is running great again!!!!!!!!

Thanks Ryan,

ECU-IG No 2 7.5A fuse in the cabin: