Need help to figure out what this harness is. And how to fix

This harness is on the driver side kick plate. My sunroof drain leaked and caused 2 pins in here to short/corrode but I can’t for the life of me find a drawing for what this harness is to. Any help would be appreciated.

 

Welcome to the forum.

There are some very savvy electricians that frequent this forum. Since it is a holiday weekend, please be patient and I am sure someone will chime in.

 

I think it's for the power seats/TMPS/Horn:

 

@Borracho Loco, that is for a 4th generation, not a 5th generation.

@Apollo, the connector you are looking at is FA1, which is one of the major connectors where the Engine bay harness and main dash harness connect. See below.



What issues are you experiencing with the vehicle? This will help ID which circuits are affected.


The pins #1, #2, #3 look like they shorted. The pins look OK as far as corrosion goes, but the image is not the best. All fuses for those circuits are in the engine bay fuse box. Pin #1 should be a green wire, and is 30A fused power for the towing component of the flasher relay assembly. Pin #2 is a green wire and is 30A fused for the PTC NO. 2 Relay for the accessory heating element (one of 3x circuits for this). Pin #3 is White and is 30A fused for the PTC NO. 3 Relay for the accessory heating element.




Please double check that those wire colors are consistent with what I have described, as I am going based off a 2012 diagram.

Those style connectors are very difficult to de-pin correctly and you will cause more damage trying to pull the terminals out (This connector is not available from any source as a repair part, FYI). I would get some contact cleaner spray and blast that connector to drive out any residual moisture. All those fuses are blown. I would just replace them after drying everything out.

 

@Old Red thank you so much for the detailed explanation and drawings! As of right now the only codes on the truck are
C1404 rear speed circuit malfunction
C1290 steering angle sensor
C1201 engine control system

other than these codes and the MTSS and trac light flashing everything on the truck functions as should. With the exception of the MTSS and KDSS which has been removed due to long travel suspension. As far as colors go my pin 1 is gray, pin 2 green, pin 3 white.