SeanSinha

Can anybody tell me the part number for the trunk hinge harness that commonly decides to crack due to being stressed? Mine has brittle wires and I'd like to replace it, as I believe it's the reason for my Light Bulb out errors.

peterls

Personally, I think that the trunk harness thing has been blown out of proportion. It has been mentioned numerous times when people had problems with their brake lights, and other things, and almost every time it turned out to be something else.
In my case, it was the warning light module which is in the trunk. Those go bad and give all kinds of problems. Once they fail completely, your rear lights and/or brake lights stop working all together.

SeanSinha

In my Lexus service history, they've fixed the harness twice

Legender

Not sure you want to buy and replace the entire harness. Most just fix the wires.
This might be helpful.
https://www.clublexus.com/forums/ls-...ss-pinout.html
and this.
https://www.clublexus.com/forums/ls-...-in-trunk.html

also might want to check the lexls.com site.

Assuming you have an LS that is pre-1995 where these problems were occurring.

dicer

I would think knowing the correct year of the LS would help, they maybe different.

PureDrifter

iTrader: (10)

repair the harness following the steps here:
http://www.lexls.com/tutorials/lighting/bulbout.html

The complete harness will be multiple hundreds of dollars, if it is available separately. We wouldn't be able to tell you without knowing the year of your LS and the market it was sold in.

Kansas

The trunk hinge harness issue was what brought me to this forum for the first time in the early 2000's when my 1990 LS400 started bucking like a bronco and the transmission shifted erratically or not at all. I found the solution on this forum and easily repaired the hinge wires. I sold my 90 LS400 at 183,000 miles in 2003 to a friend. He had to occasionally repair the trunk hinge harness over the next 120,000 miles he drove the car.

I remember a thread on one of the Lexus forums about a person taking his gen 1 LS400 to a transmission shop when his transmission started acting up. They installed a rebuilt transmission. Guess what he later found. The shop had also repaired the wires in the trunk hinge. He didn't need a new transmission at all.

SeanSinha

Sorry, it's a 1991 LS400.

I would really love to replace the harness at this point, as it's had two repair jobs at Lexus. This car had been dealer serviced up until 2009, with the last service being an alternator/belt/fan clutch replacement at 280K. It now has 310K, so it has only had 30K put on it in 7 years.