RL V6-3.5L (2007)
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.
B-CAN ECUs
-
Gauge control module
-
Relay control module
-
MICU
-
Driver's MPCS unit
-
Hands Free Link control unit
-
Power seat control unit
-
Adaptive front lighting control unit
-
Keyless access control unit
-
Acura Link control unit (XM receiver)
-
On Star control unit ('05-06 models)
-
Combination switch control unit
F-CAN ECUs
-
Gauge control module
-
PCM
-
VSA modulator-control unit
-
TPMS control unit
-
SH-AWD control unit
-
Climate control unit
-
Adaptive cruise control unit ('06-07 models)
-
E-pretensioner unit ('06-07 models)
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. Ignition switch is turned ON (II).
2. The driver's MPCS unit transmits a door lock switch message.
3. The MICU, relay control module, gauge control module, keyless access control unit and OnStar control unit* (if applicable) receive the door lock
switch message.
* :'05-06 models
4. The communication circuit test is passed.
Since the door lock switch message was received by all the ECUs expecting to receive a message, the communication circuit between those units is OK.
There are multiple messages sent and received by each ECU during this time to insure that the communication circuit is intact.
Failed circuit
5. Ignition switch is turned ON (II).
6. The driver's MPCS unit transmits a door lock switch message.
7. The MICU, relay control module, gauge control module, keyless access control unit and OnStar control unit* (if applicable) except to receive the
door lock switch message, but since there is a break in the communication circuits, it is not received.
*: '05-06 models
