U1504 – Rain light sensor time-out MMC Colt

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TROUBLE JUDGMENT

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COMMENT ON TROUBLE SYMPTOM

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PROBABLE CAUSES

Malfunction of the rain light sensor

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

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DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-39 rain light sensor connector

Q. Is the check result normal?

STEP 2. Voltage measurement at C-39 rain light sensor connector.

Q. Is the check result normal?

STEP 3. Check the wiring harness between C-39 rain light sensor connector terminal No.1 and the fusible link (1).

Check the power supply line for open circuit.

Q. Is the check result normal?

STEP 4. Resistance measurement at the C-39 rain light sensor connector.

Q. Is the check result normal?

STEP 5. Check the wiring harness between C-39 rain light sensor connector terminal No.3 and the body earth.

Check the earth wires for open circuit.

Q. Is the check result normal?

STEP 6. Connector check: B-233 ETACS-ECU connector

Q. Is the check result normal?

STEP 7. Check the wiring harness from B-233 ETACS-ECU connector terminal No. 54 to C-39 rain light sensor connector terminal No. 2.

Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?

STEP 8. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?