Code No.C1801
ACC/FCM Auto Stop lamp monitor
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Before replacing the ECU,
ensure that the communication circuit is normal.
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The ASC-ECU illuminates the stop lamp while the ACC or the FCM is braking the vehicle
automatically. The ASC-ECU monitors whether the stop lamps illuminate or go out.
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DIAGNOSIS CODE SET CONDITIONS
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The ASC-ECU stores the diagnosis code when it detects a malfunction during monitoring.
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- Damaged wiring harness and connectors
- Malfunction of ETACS-ECU
- Malfunction of ASC-ECU
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STEP 1. Check the stop lamp switch.
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The stop lamps should illuminate when the brake pedal is depressed.
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Q.
Is the check result normal?
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Go to Step 2
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Carry out troubleshooting for the stop lamps. Refer to GROUP 54A - Rear
Combination Lamp .
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STEP 2. M.U.T.-III actuator test
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When the actuator test is performed, the stop lamps should illuminate.
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- Item 11: Stop lamp:ON (Refer to
).
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Q.
Is the check result normal?
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Go to Step 4
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Go to Step 3
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STEP 3. Check of short to power supply, short to earth, and open circuit
in STLD line between ASC-ECU connector and ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 4
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Repair the connector(s) or wiring harness. Then go to Step 6.
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STEP 4. Check of short to power supply, short to earth, and open circuit
in STP line between ASC-ECU connector and stop lamp connector
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Q.
Is the check result normal?
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Go to Step 5
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Repair the connector(s) or wiring harness. Then go to Step 6.
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STEP 5. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Ignition switch "LOCK" (OFF)
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Q.
Is diagnosis code No.C1801 set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 6.
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This diagnosis is complete.
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STEP 6. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Ignition switch "LOCK" (OFF)
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Q.
Is diagnosis code No.C1801 set?
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Return to Step 1.
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This diagnosis is complete.
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