Diagnosis code No.04 Communication error with sunroof-ECU
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If diagnosis code No.04 is set in the ETACS-ECU, diagnose the CAN bus lines.
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The ETACS-ECU communicates with the sunroof motor assembly (sunroof-ECU) through the SWS communication line. If there is any trouble in that communication, diagnosis code No.04 will be set.
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For vehicles without sunroof, diagnosis code No.04 does not mean that there is a problem.
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COMMENTS ON TROUBLE SYMPTOM
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The sunroof motor assembly (sunroof-ECU), the ETACS-ECU, connector(s), or wiring harness between the two may be defective.
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- Malfunction of the sunroof motor assembly (snuroof-ECU)
- 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)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) position to ON
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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 power supply and earth lines to the ETACS-ECU and the sunroof motor assembly (sunroof-ECU) and the SWS communication lines are normal.
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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 "SUNROOF ECU" menu. : Refer to Inspection Procedure A-5 "Communication with sunroof motor assembly (sunroof-ECU) is impossible ."
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"NG" is displayed on the "ETACS ECU" menu. : Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is impossible ."
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