Installed Gentex mirror but temperature is not reading

[williambmac]

So I picked up a gentex 177 mirror a few weeks ago and did the install over the weekend. It's out of a 02 tahoe and uses 4 circuits.
Made my own mirror harness. Install went easy. Everything powered up. My only problem is AAT is reading OC, which according to Gentex is "open Circuit"

The sensor is there and is functional, if I unplug it, SES light comes on and I blow a P0071code. The mirror is good because I can short the sensor reference and ground circuits together and the temp on the mirror climbs to 183 degrees, then reads SC, "short circuit".
What I am trying to figure out is Chryslers wiring schematic, its just awful. I can see were the signal circuit goes back to the PCM but can't find where it comes up thru the dash and if there are any other connectors or splice packs that the circuits runs through.

 

[TJ4Jim]

As far as I know the mirror does not use the PCM and only needs a 12V source and a 2 wire stand alone circuit for the sensor. That's how my mirror is setup.

 

[CharlesHS]

This Forum has TJ Resources section which has your FSM that you can download in PDF and find the electrical wiring in Section 8W.

https://wranglertjforum.com/threads...ice-manuals-fsm-technical-documentation.4618/

 

[williambmac]

I'

There is a section on the Forum TJ Resources which has FSM that you can download a PDF and find the electrical wiring in Section 8W.

https://wranglertjforum.com/threads...ice-manuals-fsm-technical-documentation.4618/

I was using Alldata, but it doesn't have a complete wiring schematic. thanks.

 

[williambmac]

Alldata is incorrect. It has me diagnosing the AAT sensor for the PCM, not the mirror. That was a waste of time.

 

[williambmac]

Fixed.

 

[TJ4Jim]

Fixed.

So what was the fix.

 

[williambmac]

So what was the fix.

If you follow Alldata schematics, it keeps referencing the AAT sensor on the right side of the vehicle. This is the AAT sensor for the HVAC system and runs through the PCM.
There is also a AAT sensor on the left side of the vehicle which is for the Rearview mirror. The connector was tucked out of sight. I ordered a sensor and it will be here later.
The link above for the factory service manual had more wiring diagrams than Alldata

 

[CharlesHS]

If you follow Alldata schematics, it keeps referencing the AAT sensor on the right side of the vehicle. This is the AAT sensor for the HVAC system and runs through the PCM.
There is also a AAT sensor on the left side of the vehicle which is for the Rearview mirror. The connector was tucked out of sight. I ordered a sensor and it will be here later.
The link above for the factory service manual had more wiring diagrams than Alldata

Good to hear that you found the problem and the FSM wiring provided the information you needed.

 

[williambmac]

All is good