The Electronic Control Unit on my FJ Cruiser is not relaying the signal properly to the rear differential lock actuator when I switch it on.
I want to bypass the ECU altogether and make the switch lock and unlock the diff on-demand. How do I do this?
I have the circuit diagrams but some parts I can't make sense of. Does anyone have experience with Toyota circuit diagrams?
Also, the shop at the Toyota dealer confirmed the ECU failure. According to them the actuator is working fine.
Edit 2 and happy conclusion:
So much for the shop's diagnosis. Very recently I took it off road again and after a couple of bumps I decided to push the REAR LOCK button once more. It worked fine. Bought my '07 FJ used in '14 and it took almost 3 years of use to shake it loose. Seems the previous owner never even tried to use the locker and it was seized.
Show your truck some love and take it off road for some exercise!