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Section 527 (Wiper & Washer System): Inspection

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FRONT WIPER AND WASHER SWITCH CONTINUITY 
    FRONT WIPER AND WASHER SWITCH SPECIFIED CONDITION TABLE

    Switch position Tester connection Specified condition
    OFF 7 - 16 Continuity
    AUTO 7 - 16, 4 - 14 Continuity
    LO 7 - 17 Continuity
    HI 8 - 17 Continuity
    Washer OFF - No Continuity
    Washer ON 2 - 11 Continuity

    If continuity is not as specified, replace the switch.

    Fig 1: Identifying Harness Connector Terminal
    G03485824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FRONT WIPER AND WASHER SWITCH CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 2 .

    Fig 2: Identifying Harness Connector Terminal
    G03485825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    FRONT CONNECTOR TERMINAL SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    2 - Ground Always Continuity
    11 - Ground Ignition switch LOCK or ACC No voltage
    11 - Ground Ignition switch ON Battery positive voltage

    If circuit is not as specified, inspect the circuits connected to other parts.

  3. INSPECT FRONT WIPER INTERMITTENT OPERATION 
    1. Turn the wiper switch to INT position.
    2. Turn the intermittent time control switch to FAST position.
    3. Connect the battery positive (+) lead to terminal 16 and the battery negative (-) lead to terminal 2.
    4. Connect the voltmeter positive (+) lead to terminal 7 and the voltmeter negative (-) lead to terminal 2, and check that the meter needle indicates battery voltage.
      Fig 3: Inspecting Front Wiper Intermittent Operation (Terminal 2)
      G03485826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. After connecting terminal 16 to terminal 17, connect to terminal 2 to terminal 17, check the voltage rises from 0 volts to battery voltage within the times as shown in Fig 4 .
      Fig 4: Inspecting Front Wiper Intermittent Operation Table
      G03485827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If operation is not as specified, replace the wiper and washer switch.

      Fig 5: Inspecting Front Wiper Intermittent Operation (Terminal 17)
      G03485828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT REAR WIPER AND WASHER SWITCH CONTINUITY 
    REAR WIPER AND WASHER SWITCH SPECIFIED CONDITION TABLE

    Switch position Tester connection Specified condition
    Washer 1 2 - 12 Continuity
    OFF - No Continuity
    INT 2 - 13 Continuity
    ON 2 - 10 Continuity
    Washer 2 2 - 10 - 12 Continuity

    If continuity is not as specified, replace the switch.

    Fig 6: Identifying Switch Position
    G03485829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT REAR WIPER AND WASHER SWITCH CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 7 .

    Fig 7: Identifying Harness Connector Terminal
    G03485830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    REAR CONNECTOR TERMINAL SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    2 - Ground Always Continuity
    12 - Ground Ignition switch ON Battery positive voltage

    If circuit is not as specified, inspect the circuits connected to other parts.

  6. Low Speed: INSPECT FRONT WIPER MOTOR OPERATION 

    Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 5, and check that the motor operates at low speed.

    If operation is not as specified, replace the motor.

    Fig 8: Inspecting Front Wiper Motor Operation (Low Speed)
    G03485831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. High speed: INSPECT FRONT WIPER MOTOR OPERATION 

    Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, and check that the motor operates at high speed.

    If operation is not as specified, replace the motor.

    Fig 9: Inspecting Front Wiper Motor Operation (High Speed)
    G03485832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Stopping at Stop Position: INSPECT FRONT WIPER MOTOR OPERATION 
    1. Operate the motor at low speed and stop the motor operation anywhere except at the stop position by disconnecting the battery positive (+) lead from terminal 1.
      Fig 10: Inspecting Front Wiper Motor Operation (Stopping At Stop Position)
      G03485833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals 1 and 3.
    3. Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 5, and check that the motor stops running at the stop position after the motor operates again.

      If operation is not as specified, replace the motor.

      Fig 11: Connecting Battery Lead To Terminal
      G03485834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. Connector disconnected: INSPECT FRONT WIPER MOTOR CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 12 .

    Fig 12: Inspecting Front Wiper Motor Circuit
    G03485835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    FRONT WIPER MOTOR SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    5 - Ground Always Continuity
    2 - Ground Ignition switch LOCK or ACC No voltage
    2 - Ground Ignition switch ON Battery positive voltage

    If circuit is not as specified, inspect the circuits connected to other parts.

  10. Low Speed: INSPECT REAR WIPER MOTOR OPERATION 

    Connect the battery positive (+) lead to terminal 3 and the battery negative (-) lead to terminal 2, and check that the motor operates at low speed.

    If operation is not as specified, replace the motor.

    Fig 13: Inspecting Rear Wiper Motor Operation (Low Speed)
    G03485836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. Stopping at Stop Position: INSPECT REAR WIPER MOTOR OPERATION 
    1. Operate the motor at low speed and stop the motor operation anywhere except at the stop position by disconnecting positive (+) lead from terminal 3.
      Fig 14: Inspecting Rear Wiper Motor Operation (Stopping At Stop Position)
      G03485837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals 3 and 4.
    3. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the motor stops running at the stop position after the motor operates again.

      If operation is not as specified, replace the motor.

      Fig 15: Connecting Battery Lead To Terminal
      G03485838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. Connector disconnected: INSPECT REAR WIPER MOTOR CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 16 .

    Fig 16: Inspecting Rear Wiper Motor Circuit (Connector Disconnected)
    G03485839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    REAR WIPER MOTOR SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    1 - Ground Ignition switch OFF or ACC No voltage
    1 - Ground Ignition switch ON Battery positive voltage
    2 - Ground Always Continuity
    3 - 4 Always Continuity

    If circuit is not as specified, inspect the circuits connected to other parts.

  13. INSPECT FRONT WASHER MOTOR OPERATION 

    Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 1, check that the motor operates.

    NOTE: These tests must be performed quickly (within 20 seconds) to prevent the coil from burning out. 

    If operation is not as specified, replace the motor.

    Fig 17: Inspecting Front Washer Motor Operation
    G03485840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. Connector disconnected: INSPECT FRONT WASHER MOTOR CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 18 .

    Fig 18: Inspecting Front Washer Motor Circuit (Connector Disconnected)
    G03485841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    FRONT WASHER MOTOR SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    2 - Ground Ignition switch ON Battery positive voltage

    If circuit is not as specified, inspect the power source and wire harness.

  15. INSPECT REAR WASHER MOTOR OPERATION 

    Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 1, check that the motor operates.

    NOTE: These tests must be performed quickly (within 20 seconds) to prevent the coil from burning out. 

    If operation is not as specified, replace the motor.

    Fig 19: Inspecting Rear Washer Motor Operation
    G03485842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. Connector disconnected: INSPECT REAR WASHER MOTOR CIRCUIT 

    Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown in Fig 20 .

    Fig 20: Inspecting Rear Washer Motor Circuit (Connector Disconnected)
    G03485843Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    REAR WASHER MOTOR SPECIFIED CONDITION TABLE

    Tester connection Condition Specified condition
    2 - Ground Ignition switch ON Battery positive voltage

    If circuit is not as specified, inspect the power source, the wire harness and the wiper switch.

  17. INSPECT REAR WIPER RELAY OPERATION (See  PROBLEM SYMPTOMS TABLE  ) 
  18. INSPECT REAR WIPER RELAY INTERMITTENT OPERATION (See  PROBLEM SYMPTOMS TABLE  ) 
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