[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for 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 by using 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: Is 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 column switch (column-ECU) is not possible ."
"NG" is displayed on the "FRONT ECU" menu.:  Refer to Inspection Procedure A-4 "Communication with 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 condition
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.
  1. Disconnect the connector, and measure at the wiring harness side.
  1. Continuity between B-07 windshield wiper motor connector terminal No.4 and body earth
    2. 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 junction connector C-17 <L.H. drive vehicles> 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.
  1. Remove the front-ECU, and measure at the junction block side.
  1. Ignition switch: ACC
  1. Check the voltage between the A-12X front-ECU connector terminal No.28 and body earth.
    2. 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.
[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for 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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