[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-2: Communication with the column switch (column-ECU) is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE A-2: Communication with the column switch (column-ECU) is not possible.
| CAUTION Whenever the ECU is replaced, ensure that the power supply circuit, the grounding circuit and the communication circuit are normal.
| COMMENTS ON TROUBLE SYMPTOM The power supply circuit to the column switch (column-ECU) may be defective. If the wiring harness of the battery power supply circuit for the ECU (column switch terminal No.1) is defective, also check the power supply circuit to the ignition switch (IG1) (column switch terminal No.9) and repair if necessary.
| POSSIBLE CAUSES Malfunction of the column switch Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. ECU check on the SWS monitor Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal. Ignition switch: OFF ECUS TO BE CHECKED ETACS OK: "OK" is displayed on the "ETACS ECU" menu. Q: Is the check result normal? YES: Go to Step 2. NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible" .
| Step 2. Connector check: C-310 column switch connector Q: Is the check result normal? YES: Go to Step 3. NO: Repair the defective connector.
| Step 3. Measure the voltage at C-310 column switch connector. Disconnect the connector, and measure at the wiring harness side. Voltage between C-310 column switch connector terminal No.1 and body earth OK: Battery positive voltage Q: Is the check result normal? YES: Replace the column switch. NO: Go to Step 4.
| Step 4. Check the wiring harness between C-310 column switch connector terminal No.1 and the fusible link (1). NOTE: Prior to the wiring harness inspection, check junction block connectors C-202, C-204 and intermediate connectors A-14, C-125, and repair if necessary. Check the power supply line for open circuit. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.
| Step 5. Measure the resistance at the C-310 column switch connector. Disconnect the connector, and measure at the wiring harness side. Resistance between C-310 column switch connector terminal No.4 and body earth OK: 2Ω or less Q: Is the check result normal? YES: Go to Step 7. NO: Go to Step 6.
| Step 6. Check the wiring harness between C-310 column switch connector terminal No.4 and the body earth. Check the earth wires for open circuit. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.
| Step 7. Connector check: C-219 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 8. NO: Repair the defective connector.
| Step 8. Check the wiring harness from C-219 ETACS-ECU connector terminal Nos. 59 and 68 to C-310 column switch connector terminal Nos. 3 and 2. NOTE: Prior to the wiring harness inspection, check joint connector C-02, and repair if necessary. Check the communication lines for open circuit. Q: Is the check result normal? YES: Go to Step 9. NO: Repair the wiring harness.
| Step 9. ECU check on the SWS monitor Ignition switch: OFF ECUS TO BE CHECKED Column-ECU OK: "OK" is displayed on the "COLUMN ECU" menu. Q: Is the check result normal? YES: Go to Step 10. NO: Replace the column switch.
| Step 10. Retest the system. Check that the ETACS-ECU communicates with the column switch. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Replace the ETACS-ECU.

[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-2: Communication with the column switch (column-ECU) is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

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