2004 LS430 right tail light went out. Problem was traced to corrosion on the terminals of the REAR TRUNK FUSE JUNCTION BOX. I cleaned the wiring harness and replaced the Junction Box with a used one problem solved. But now my gas gauge turns on and looks like it is working (but reads incorrect gas level) for 10 seconds. Then it goes to off position with the low fuel warning light lit.

I looked for error codes but there are none.

I had another fuel tank sending unit from a problem a few years ago. Swapped it and same problem.

Any ideas other than the replaced junction box? Thanks for any help.

 

It probably has something to do with the replaced trunk fuse box, in particular, the ECU. The LS430 has 2 fuel gauges - the main unit is located under the driver-side rear seat, and the secondary unit under the passenger-side rear seat. Each level gauge has 3 signal wires going to the ECU. Please check to make sure they are properly connected.

 

Thanks for the reply.

I looked at the Luggage Room J/B and mine is similar but not the same. Mine is a 82670-50080 and doesn't have the connector top right with 18 pins.

I also didn't know there was a fuel level sender on each side. I replaced the passenger side.

I've pulled all the connectors and reseated them, no change. Perhaps the drivers side sending unit?

 

 

Sorry to bring up old thread. My tail lights stopped working so I replaced the JB fuse box. I put some electronics cleaner on terminals harness and plugged it back in now my tail lights work but my gas gauge show low fuel and my trunk won’t open . Additionally, I can’t change the display on my dash like for example the mileage the MPG’s none of those mode and display buttons on my steering wheel work also, I can’t tilt the steering wheel up or down like I was able to before and also each time I turn off the car, my mirrors fold in and I can’t change the setting to just stop that from happening so I don’t know what happened or are you ever able to resolve your issue?

 

Check the harness behind the dome light piece that has wires that connect to the dash etc. I had a mouse chew threw them and a ton of stuff would not work.

 

Thank you for responding. I found out the problem. It was the fuse box. I am sending it back and gonna try to order another.

 

I sent the fuse box back and ordered an another one from EBay. Plugged it in and now everything works, my tail lights, gas gauge and trunk opens.

 

how did water get into the trunk? have you fixed that problem so it's not reoccurring ?

 

yes, I did find the problem. The rear tail light was missing a gasket. There was no gasket around that tail light that is on the quarter panel so I ordered a gasket and put it in.