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The ABS warning lamp illuminates or goes out by the transistor control inside the ASTC-ECU. In this circuit, when the transistor is ON, the ABS warning lamp illuminates. Even when the ASTC-ECU is deactivated, the ABS warning lamp is illuminated by the valve relay.
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Possible causes include the combination meter power circuit, disconnected earth circuit, dead lamp bulb, or short circuited ABS warning lamp.
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The most likely causes for this case are:
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- Blown fuse
- Damaged wiring harness or connector
- Malfunction of valve relay
- Burnt out ABS warning lamp bulb
- Combination meter defect
- Malfunction of the ASTC-ECU
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(1)Do not disconnect combination meter connector D-02, and check at the harness side.
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(2)Disconnect ASTC-ECU connector D-232.
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(3)Turn the ignition switch to the "ON" position.
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(4)Measure the voltage between terminal 50 and earth.
OK: System voltage
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Q.
Is the check result normal?
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 Replace the combination meter. Then go to Step 5.
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Q.
Is the check result normal?
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Repair the defective connector. Then go to Step 5.
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Check the wiring harness for open circuit.
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Q.
Is the check result normal?
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Repair the harness wire. Then go to Step 5.
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Q.
Does the ABS warning lamp illuminate when the ignition switch is turned to the "ON" position with engine stopped?
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 It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction  .
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Replace the ASTC-ECU. Then go to Step 5.
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Q.
Does the ABS warning lamp illuminate when the ignition switch is turned to the "ON" position with engine stopped?
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The procedure is complete.
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