Lexus Troubleshooting Questions? Ask a Lexus Expert
Hi, my name is ***** ***** you ground the purple wire at the relay and everything works?
ok, then you have a bad ECM, can you go to the BCM and ground that wire at the BCM and see if everything would too?
the ECM is the main computer, the BCM is the body control module, the computer for the body electrical
if you ground the wire permantly, the relay will always be engaged and it can run the battery down,Tim
The ECM is located on the left front of the engine compartment, it is direcrly behind the drivers side headlamp, and yes, the keys will need to be reprogrammed in to the new ecm,Tim
No, the ecm does not ground the relay, the BCM grounds the relay, body control module,Tim
the only other thing that can cause this is a bad ground going to the BCM, you can check all the grounds at the BCM, if they are good, it can only be a bad BCM,Tim
Yes, it is also called a mutiplexer by some,Tim
did you check all the grounds at the BCM?