2013 DB9 TPMS puzzler

[TBM850]

Hello all,

I've tried troubleshooting this to the limit of my capabilities. I wonder if any of the knowledgeable folks on here might have some suggestions.

2013 DB9 LHD

TPMS consistently faults after being parked up last winter.

3 good sensors. Only the passenger side rear wheel sensor consistently cannot be detected.

I replaced all four sensors with new. No luck.

Replaced the wheel arch TMPS antenna with a serviceable one. No luck.

Took out the TPMS ECU and cleaned the connector pins. No luck.

The ECU seems to be doing its job and is detecting the same three wheels that didn't have a fault before, so I doubt that is the issue. New antenna and wheel sensor addressed those possibilities.

I am beginning to think I have a broken wire in the circuit for the passenger side rear wheel TPMS sensor.

Where does the harness route after it leaves the TPMS ECU? How would I test it?

I did have some minor mouse damage on the firewall ground wires that are directly behind the engine bay fusebox. I believe that I did repair all those but does the TPMS have any wiring in that area?

Any suggestions would be greatly appreciated.

Cheers

Paul