P1560 code and possible fix

[GinaCico]

Having intermittent issues with my '05 Legacy GT LTD wagon.

 

Symptoms:

- occasional, intermittent CEL

- code reader fails, no connection (until yesterday, when it produced P1560 - Backup Voltage Circuit)

- CEL will magically clear itself after a day or two

- occasional hard start, eventually turns over

- symptoms may coincide with wet conditions, but are random so it's hard to tell

- starter battery was recently replaced, alternator tested fine

 

Searching around, I found this Outback owner who had the EXACT same symptoms and discovered a worn wire where it enters the cabin, between the fuse block and the OBD port. Helpfully, there are pictures.

 

https://www.subaruoutback.org/threads/p1560-not-the-fuse.458770/

 

My question.... How hard is it to access this wiring harness? Can I get to it from inside the car, or have to access under the inner fender? Recommended process?

 

TIA!