Electrical Issues after plugging in wrong trailer hitch plug (Airbag, ABS, B2799,C1340, C1223,C0279)

[jayLC1]

I was recently given a trailer and a riding mower that needs some work by my step-father. This was a great deal, but in the process something went wrong.

The trouble seems to have begun when the plug for the trailer was plugged into the jack on my trailer hitch. At first we thought a fuse was blown, only some of the lights flipped on when I hit the brakes and turn signal. As it worked out, the wrong kind of jack was plugged in. My sister had a Toyota adapter and it seemed all was well - the trailer brake lights worked.

However, I noticed within the hour that my airbag light was on. A week later I would have the codes read at Advanced Auto and would be given 4 codes:
C0279 - Anti-lock Brake System Solenoid Delay Circuit (Current)
C1223 - Malfunction in Anti-lock Brake System Control System (Current)
C1340 - Open Ckt in Ctr Diff lock signal (Current)
B2799 - Engine Immobilizer System (History)

I am not sure if something was shorted out when I was pulling fuses (while car idled) to look for one that was blown, or when we connected the wrong pattern plug. However, it seems that in the info I have found online, many of these items are related the wiring harness part in the steering/ignition area.

Thoughts before I end up spending huge $$ at a dealership.

 

[jayLC1]

Additional Info:
2004 (100 Series) Land Cruiser, 148,000 miles, I bought ~6mo ago. Previously dealer serviced, never taken North (no rust!).

 

[TXLX100]

Pulling fuses while the car is running can cut power to systems and potentially cause warning lights. I'd disconnect the battery, and reconnect and see if it takes care of the light. Or it could be a non-related issue.

What do you mean the harness was the wrong kind? The 100 probably had/has a bad taillight converter, or an improperly installed one, if the trailer lights aren't working 100%. It's a pretty common failure.

 

[jayLC1]

Pulling fuses while the car is running can cut power to systems and potentially cause warning lights. I'd disconnect the battery, and reconnect and see if it takes care of the light. Or it could be a non-related issue.

Thanks for input!

I did that yesterday. I have not been out to have the codes read again, but the airbag light was still on. After reading the repair manual, I noticed there are sensors that detects how far back the front seats are. Since I often connect the back strap to my daughter's seat to the bottom of the front seat, I am wondering if that position sensor was thrown off when the seat had some tension pulling it back?

What do you mean the harness was the wrong kind? The 100 probably had/has a bad taillight converter, or an improperly installed one, if the trailer lights aren't working 100%. It's a pretty common failure.

There is a plug in the back to connect the trailer to the truck. This was my first time playing with a trailer, but as it worked out, the plug he plugged in was not the same on his previous domestic truck as on my Toyota. My sister, spotted that it was not the right plug, grabbed one off her Toyota and we were in business with all lights working. I am concerned that with the wrong plug attached, something was shorted or cross wired just enough to screw up something.

 

[PADDO]

Are the warning lights still lit? If so I think you'll find those C codes are held in memory and have to be positively cleared with an ABS capable OBD code scanner/reset tool or techstream. I've been told that the auto parts store places may not reset ABS related codes because of potential legal ramifications, YMMV. Hopefully the trailer plug connection didn't do any damage and just confused one or more ECUs which can be cleared and reset. I have an Innova 3150b and it reads/clears ABS codes if that still needs to be done.