TL V6-3.2L (2004)
2. The door multiplex control unit transmits a door switch signal.
3. The multiplex integrated control unit (MICU), relay control module, and gauge control module expect to receive the door lock switch signal, but
since there is a break in the communication circuits, it is not received.
4. Each ECU that expects to receive the door lock switch signal from the door multiplex control unit will transmit DTCs for the signal that it did not
receive
Since there is a break in the communication circuit, the door lock switch signal could not be received by the gauge control module, multiplex integrated
control unit (MICU), or the relay control module Each of these units will set "loss of communication" error codes for the signal(s) they did not receive
There may be multiple communication DTCs if the unit that has become disconnected from the network would normally transmit multiple messages
during the communication line test For example, the door multiplex control unit sends the keyless panic signal and door lock switch signal during the
communication circuit test
Diagnostic Trouble Codes (DTC)
There are three types of DTCs used by the CAN networks.
Troubleshooting the CAN circuit related problems
Using the HDS (Preferred method)
1. Go to B CAN System Diagnosis Test Mode A to check for "Connected units" and DTCs.
2. If no DTCs are retrieved, go to B-CAN System Diagnosis Test Mode C or D
Without the HDS (Use only if HDS is unavailable)
1. Check for communication circuit problems using B CAN System Diagnosis Test Mode 1.
2. Check for DTCs while in Mode 1.
NOTE: If the problem is related to the display panel control unit or HandsFreeLink system, check for DTCs first with their own self-diagnostic
function.
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HandsFreeLink control unit self-diagnostic function.
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Display panel control unit self-diagnostic function.
3. Sort, and then troubleshoot the DTCs in the order below.
-1 Battery voltage DTCs
-2 Internal error DTCs
