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- ASTC-ECU sends the illumination request signal of the break warning lamp
to the combination meter via the CAN communication.
- ASTC-ECU illuminates brake warning lamp for approximately 3 seconds for bulb check
with the ignition switch turned to the ON position.
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This may be caused by faults in the CAN bus line, combination meter or ASTC-ECU.
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- Damaged wiring harness and connectors
- Malfunction of the combination meter
- ASTC-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 Diagnostics Table .)
Then go to Step 6.
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Use M.U.T.-III to check the diagnosis code for the ASTC 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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Perform the following special function by the combination meter system, and check if the
ABS warning lamp illuminates (Refer to GROUP 54A - Combination Meter ).
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Q.
Is the check result normal?
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Replace the combination meter.
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Using M.U.T.-III, check that diagnosis code is not set by the combination meter system.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter (Refer to GROUP 54A - Combination Meter/Diagnosis
Code ). Then go to Step 6.
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Q.
Does the brake warning lamp turn ON and OFF
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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Replace the hydraulic unit (ASTC-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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