[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - WINDSHIELD WIPER AND WASHER - INSPECTION PROCEDURE G-1: The windshield wipers does not work at all. | PRINT PAGE / INDEX / PRIOR / NEXT

WINDSHIELD WIPER AND WASHER

INSPECTION PROCEDURE G-1: The windshield wipers does not work at all.
| CAUTION Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
| COMMENTS ON TROUBLE SYMPTOM The windshield wiper motor, the column switch or the front-ECU may be defective. If a problem is found in the ECU check by using the SWS monitor, also check the wiper backup circuit (between C-310 column switch connector terminal No.8 and A-12X front-ECU connector terminal No.26) and repair if necessary.
| POSSIBLE CAUSES Malfunction of the windshield wiper motor Malfunction of the column switch Malfunction of the front-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 column switch (column-ECU) and the front-ECU and the SWS communication lines are normal. Turn the ignition switch to the ON position. ECUS TO BE CHECKED COLUMN ECU FRONT ECU OK: "OK" are displayed for all the items Q: Are the check result normal? "OK" are displayed for all the items: Go to Step 2. "NG" is displayed on the "COLUMN ECU" menu.: Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible ." "NG" is displayed on the "FRONT ECU" menu.: Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible ."
| Step 2. Function diagnosis by using the SWS monitor Check the SWS communication signal, which are related to the windshield wiper function. <Selected item> F.WIPER INT Turn the ignition switch to the ACC position. Windshield wiper switch: INT
Item No. | Item name | Normal conditions
--- | --- | ---
Item 05 | INT WIPER SW | ON
Item 31 | IGNITION SW ACC | ON
Item 70 | FRONT ECU ACK | NORMAL ACK or HI-BEAM ACK
OK: Normal conditions are displayed for all the items. Q: Is the check result normal? Normal conditions displayed for all the items: Go to Step 3. Normal condition is not displayed for item No.05: Replace the column switch. Normal condition is not displayed for item No.31: Refer to inspection procedure P-1 "The ignition switch (ACC) signal is not received ." Normal condition is not displayed for item No.70: Replace the front-ECU.
| Step 3. Connector check: B-07 windshield wiper motor connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the connector.
| Step 4. Check the windshield wiper motor assembly. Refer to GROUP 51 - Windshield wiper . Q: Is the check result normal? YES: Go to Step 5. NO: Replace the windshield wiper motor assembly.
| Step 5. Measure the resistance at the B-07 windshield wiper motor connector. Disconnect the connector, and measure at the wiring harness side. Continuity between B-07 windshield wiper motor 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 B-07 windshield wiper motor connector terminal No.4 and body earth. NOTE: Prior to the wiring harness inspection, check the joint connector C-17 and repair if necessary. 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. Measure the voltage at the A-12X front-ECU connector. Remove the front-ECU, and measure at the junction block side. Ignition switch: ACC Check the voltage between the A-12X front-ECU connector terminal No.28 and body earth. OK: Battery positive voltage Q: Is the check result normal? YES: Go to Step 9. NO: Go to Step 8.
| Step 8. Check the wiring harness between A-12X front-ECU connector terminal No.28 and ignition switch (ACC). NOTE: Prior to the wiring harness inspection, check the junction block connectors C-202, C-203 and intermediate connector C-116 and repair if necessary. Check the power supply line to ignition switch (ACC) 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 9. Retest the system. The windshield wiper should now work normally at all. 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 front-ECU.

[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - WINDSHIELD WIPER AND WASHER - INSPECTION PROCEDURE G-1: The windshield wipers does not work at all. | PRINT PAGE / INDEX / PRIOR / NEXT

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