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ASC-ECU sends the illumination request signal of the break warning lamp to the combination
meter through ETACS-ECU via the CAN communication.
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This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.
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- Damaged wiring harness and connectors
- Malfunction of ETACS-ECU
- Combination meter malfunction
- ASC-ECU malfunction
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ).
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Use M.U.T.-III to check the diagnosis code for the ASC system.
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Q.
Is the diagnosis code set?
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Carry out the diagnosis for the diagnosis code (Refer to ).
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Refer to GROUP 54A - Combination meter .
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Q.
Is the check result normal?
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Troubleshoot the combination meter (Refer to GROUP 54A - Combination
meter, Troubleshooting ), and then go to Step 6.
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Using M.U.T.-III, check that diagnosis code No.U0141 is not set by the combination meter
system.
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Q.
Is the diagnosis code set?
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Troubleshoot the combination meter (Refer to GROUP 54A - Combination
meter, Troubleshooting ), and then go to Step 6.
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Using M.U.T.-III, check that diagnosis code No.U0121 is not set by the ETACS system.
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Q.
Is the diagnosis code set?
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Troubleshoot the ETACS (Refer to GROUP 54A - ETACS, Diagnosis troubleshooting
flow ), and then go to Step 6.
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Replace the ASC-ECU (Refer to ), and then go
to Step 6.
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Q.
Does the brake warning lamp turn ON and OFF normally?
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This diagnosis is complete.
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