Diagnosis code
No.01 Trouble in SWS communication line system or ETACS-ECU
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If diagnosis code No. 01
is set in the ETACS-ECU, diagnose the CAN bus lines.
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The ETACS-ECU communicates with the column
switch, the front-ECU, the sunroof motor assembly
and the power window main switch through the SWS communication line. If
there is any trouble
in the ETACS-ECU or the SWS communication lines , diagnosis code No. 01
will be set.
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COMMENT ON TROUBLE SYMPTOM
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The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or
terminals pushed back in the connector, or the ETACS-ECU may be
defective.
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- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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Step 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus
lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
the CAN bus line (Refer to GROUP 54F - Troubleshooting  ).
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Step 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Ignition switch: LOCK (OFF) position to ON
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(2)Erase the diagnosis code.
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(3)On completion, check that the diagnosis code is not
reset.
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Q.
Is the check result normal?
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If a
trouble is solved, it is determined that there is an intermittent
malfunction
such as poor engaged connector(s) or open circuit (Refer to GROUP 00
- How to use troubleshooting/Inspection
Service Points ).
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Go to Step 3.
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Step 3. ECU check by using the SWS monitor
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Check that the SWS communication lines are in
good condition.
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ECUS TO BE CHECKED
- Column ECU
- ETACS-ECU
- Front ECU
- P/W MODULE
- Sunroof-ECU
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OK: "OK" are displayed for all the
items
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Q.
Are the check result normal?
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Normal conditions are displayed for all the
items. : Intermittent malfunction (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection
Service Points ).
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"NG" is displayed on the "COLUMN ECU" menu. :
Refer to Inspection Procedure A-2 "Communication with the column switch
(column-ECU)
is not possible ."
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"NG" is displayed on the "ETACS ECU" menu. :
Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not
possible ."
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"NG" is displayed on the "FRONT ECU" menu. :
Refer to Inspection Procedure A-4 "Communication with the front-ECU is not
possible ."
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"NG" is displayed on the "P/W MODULE"
menu. : Refer to Inspection Procedure A-5 "Communication with the power
window main switch
(power window module) is not possible ."
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"NG" is displayed on the "Sunroof ECU" menu. :
Refer to Inspection Procedure A-6 "Communication with the sunroof motor
assembly (sunroof-ECU)
is not possible ."
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