Before replacing the ECU,
ensure that the input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
If each switch (up, open, close/down) of the sunroof switch has been ON
for 60 seconds, ETACS-ECU sets the diagnosis code No. L0632.
Past trouble
If diagnosis code No. L0632 is set as past trouble, carry out diagnosis with particular emphasis
on wiring and connector(s) in the CAN bus line. For diagnosis procedures, refer to How to treat
past trouble (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection Service
Points ).
note
For a past trouble, you cannot 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 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 -
CAN Bus Line Diagnostic Flow ).
PROBABLE CAUSES
Malfunction of the sunroof motor assembly
Malfunction of the sunroof switch
Damaged wiring harness and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Connector check: D-03 sunroof switch connector
and D-04 sunroof motor assembly connector
Q.
Is the check result normal?
Go to Step 2.
Repair the defective connector.
STEP 2. Check of the wiring harness between the D-03 sunroof switch
connector terminal Nos. 3, 5, 6 and the D-04 sunroof motor assembly connector terminal Nos.
4, 5, 10.
Check the input/output line for open circuit.
Q.
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
STEP 3. Diagnosis code recheck
Replace the sunroof switch. Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
)
)
)
).
Go to Step 2.
Repair the defective connector.