RL V6-3.7L (2009)
Connected ECUs
Several ECUs are connected to each of the two networks. The gauge control module is part of both networks since it is the "gateway" between them.
Here is a list of ECUs and the network they are connected to.
Network "Loss of Communication" Error Checking
The B-CAN and the F-CAN send messages to each other to check the integrity of the network communication circuit. They do this by sending a specific
digital message out after an event. For example, after turning the ignition switch to ON (II), all the ECUs on the communication circuit expect to receive
a message from other specific units within a specified amount of time. If the message is not received, the ECU will transmit a DTC reporting that it did
not receive the message.
Examples of a communication circuit test
Normal circuit
1. Turn the ignition switch to ON (II).
2. The driver's MPCS unit transmits a door lock switch message.
3. The MICU, relay control module, gauge control module, and keyless access control unit receive the door lock switch message.