Starting and OBD connection

DECAPTAIN2010

MEMBER
2006 LEXUS RX 400H
3.3L
6 CYL
4WD
AUTOMATIC
98,000 MILES

While washing the back seat water drop into the battery area and burnt the battery relay assembly but I bought another one and later found the main ECM under the dash to be affected. I also changed it but upon reprogramming there is no communication, but there was check engine light when you on ignition. Again sometimes when you start a noise sound from the traction battery area. Please how do I get communication and is the battery connected to the invert-er?

Tuesday, June 20th, 2017 AT 3:44 AM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
51,506 POSTS

Hello,

Usually the non communication problem is because one or more of the computers are not powering up. They is several relays that must activate to achieve this. Here are some guides and the complete engine and battery wiring so you can do some testing.

Make sure you stay away from the high voltage portion of the system (large wires). If your not sure don't go any further.

Here are the complete wiring diagrams for the engine and batteries for your car (below).

As you can see there are many relays and a circuit breaker that could be causing the problem.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

And

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens, we are interested to see what it is.

Cheers, Ken

Images (Click to make bigger)