If diagnosis
code U is set in the ETACS-ECU, diagnose the CAN main bus line.
Whenever the ECU is replaced, ensure that the communication circuit is normal.
TROUBLE JUDGMENT
The multi display station communicates with the ETACS-ECU via CAN bus lines. If it can
not receives the illumination signal and customisation signal from the ETACS-ECU, diagnosis
code U1109 is set.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the
multi display station, the power supply system to the multi display station, the multi display
station itself, or the ETACS-ECU may be defective.
Past trouble
Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the ETACS-ECU and the multi display station, and the power supply
system to the ETACS-ECU. For diagnosis procedures, refer to "How to cope with past trouble"
(Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).
note
For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if
there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ).
and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring
to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP
54C, Explanation about the M.U.T.-III CAN Bus Diagnostics ).
POSSIBLE CAUSES
Damaged harness wires and connectors
Malfunction of ETACS-ECU
Malfunction of multi display station
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result satisfactory?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C, Diagnosis -
Can Bus Diagnostics
Table ). Repair the CAN bus line and go to Step 4.
STEP 2. M.U.T.-III other system diagnosis code
Check that the ETACS-ECU sets a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the ETACS-ECU. (Refer to .)
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check whether ETACS-ECU-related diagnosis code U1109 is set.
Q.
Is the diagnosis code set?
Replace ETACS-ECU and then go to step 4.
Replace multi display station and then go to step 4.
STEP 4. Check whether the diagnosis code is reset.
).
