U1500 – Column switch time-out MMC Colt

---

---

---

TROUBLE JUDGMENT

---

COMMENT ON TROUBLE SYMPTOM

---

PROBABLE CAUSES

Malfunction of the lighting switch

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

---

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-238 column switch connector

Q. Is the check result normal?

STEP 2. Voltage measurement at B-238 column switch connector.

Q. Is the check result normal?

STEP 3. Check the wiring harness between B-238 column switch 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. Voltage measurement at B-238 column switch connector.

Q. Is the check result normal?

STEP 5. Check the wiring harness between B-238 column switch connector terminal No.9 and the ignition switch (IG1).

Check the power supply line for open circuit.

Q. Is the check result normal?

STEP 6. Resistance measurement at the B-238 column switch connector.

Q. Is the check result normal?

STEP 7. Check the wiring harness between B-238 column switch connector terminal No.4 and the body earth.

Check the earth wires for open circuit.

Q. Is the check result normal?

STEP 8. Connector check: B-233 ETACS-ECU connector

Q. Is the check result normal?

STEP 9. Check the wiring harness from B-233 ETACS-ECU connector terminal Nos. 54 and 64 to B-238 column switch connector terminal Nos. 3 and 8.

Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?

STEP 10. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?