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Section 42 (Headlight And Taillight System): Inspection

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  1. INSPECT LIGHT CONTROL SWITCH CONTINUITY 
    LIGHT CONTROL SWITCH CONTINUITY CONDITIONS

    Switch position Tester connection Specified condition
    OFF - No continuity
    TAIL 14 - 16 Continuity
    HEAD 13 - 14 - 16 Continuity
    AUTO 12 - 16 Continuity

    If continuity is not as specified, replace the switch.

  2. INSPECT HEADLIGHT DIMMER SWITCH CONTINUITY 
    HEADLIGHT DIMMER SWITCH CONTINUITY CONDITIONS

    Switch position Tester connection Specified condition
    Low beam 16 - 17 Continuity
    High beam 7 - 16 Continuity
    Flash 7 - 8 - 16 Continuity

    If continuity is not as specified, replace the switch.

    Fig 1: Identifying Switch Positions And Connector Terminals
    G02993937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Connector disconnected: 

    INSPECT LIGHT CONTROL SWITCH CIRCUIT 

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

    Fig 2: Identifying Light Control Switch Connector Terminals (Wire Harness Side)
    G02993938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINALS SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    13 - Ground Always Battery positive voltage
    14 - Ground Always Battery positive voltage

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

  4. Connector disconnected: 

    INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT 

    Disconnect the connector from the switch and inspect the connector on the wire harness side, as shown in Fig 3.

    Fig 3: Identifying Headlight Dimmer Switch Connector Terminals
    G02993939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    HEADLIGHT DIMMER SWITCH SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    16 - Ground Always Continuity
    8 - Ground Always Battery positive voltage

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

  5. Connector connected: 

    INSPECT LIGHT CONTROL SWITCH CIRCUIT 

    Connect the wire harness side connector to the light control and dimmer switch and inspect the connector from the back side, as shown in Fig 4.

    Fig 4: Identifying Light Control Switch Connector Terminals
    G02993940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    LIGHT CONTROL SWITCH SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    16 - Ground Always Continuity
    13 - Ground Light control switch OFF or TAIL Battery positive voltage
    13 - Ground Light control switch HEAD No voltage
    14 - Ground Light control switch OFF Battery positive voltage
    14 - Ground Light control switch TAIL or HEAD No voltage

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

  6. Connector connected: 

    INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT 

    Connect the wire harness side connector to the light control and dimmer switch and inspect the connector from the back side, as shown in Fig 5.

    Fig 5: Identifying Headlight Dimmer Switch Connector Terminals
    G02993941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    HEADLIGHT DIMMER SWITCH SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    8 - Ground Headlight dimmer switch FLASH No voltage
    8 - Ground Headlight dimmer switch LOW or HIGH Battery positive voltage
    13 - Ground Light control switch HEAD and dimmer switch LOW and fog light switch ON No voltage
    13 - Ground Light control switch HEAD and dimmer switch HIGH or FLASH and fog light switch ON Battery positive voltage

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

  7. INSPECT DAYTIME RUNNING LIGHT NO. 3 AND NO. 4 RELAY CONTINUITY 
    Fig 6: Identifying Daytime Running Light No.3 And No. 4 Relay Connectors
    G02993942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DAYTIME RUNNING LIGHT NO.3 AND NO.4 RELAY CONTINUITY CONDITIONS

    Tester connection Condition Specified condition
    A1 - B3 Always Continuity
    A3 - A5 Always Continuity
    B3 - B4 Always Continuity
    A2 - A5 Apply battery positive voltage between terminals A1 and B3. Continuity
    B1 - B2 Apply battery positive voltage between terminals B3 and B4. Continuity

    If continuity is not as specified, replace the relay.

  8. HEADLIGHT RELAY: 

    INSPECT ENGINE ROOM R/B RELAY CIRCUIT (See  INSPECTION  ) 

    HINT:

    The headlight relay is built in the engine room junction block. Also, the relay is constructed with a relay block that is in the junction block as a unit. To disconnect the wire harness connecting with relay block is impossible. If the relay has a malfunction, replace it with junction block assembly wire harness together.

    Fig 7: Identifying Relay Locations (Headlight)
    G02993943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSPECT HEADLIGHT DIMMER (DAYTIME RUNNING LIGHT NO. 2) RELAY CIRCUIT (See  PROBLEM SYMPTOMS TABLE  ) 
  10. INSPECT TAILLIGHT CONTROL RELAY: 

    INSPECT ENGINE ROOM R/B RELAY CIRCUIT (See  INSPECTION  ) 

    HINT:

    The taillight relay is built in engine room junction block. Also the relay is constructed with a relay block that is in the junction block as a unit. To disconnect the wire harness connecting with relay block is impossible. If the relay has a malfunction, replace it with junction block assembly wire harness together.

    Fig 8: Identifying Relay Locations (Taillight)
    G02993944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. AUTO ON: 

    INSPECT AUTOMATIC LIGHT CONTROL 

    1. Turn the ignition switch ON.
    2. Turn the light control switch to AUTO.
    3. Gradually cover the top of the sensor.
    4. Check the accessory lights and the headlights come on.
    Fig 9: Checking Accessory Lights And Headlights Come On
    G02993945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. AUTO OFF: 

    INSPECT AUTOMATIC LIGHT CONTROL 

    1. Gradually uncover the sensor.
    2. Check the accessory lights and the headlights go off.
    Fig 10: Checking Accessory Lights And Headlights Go Off
    G02993946Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. INSPECT LIGHT-OFF CONDITION 
    1. Turn the ignition switch ON.
    2. Lights auto ON:

      Gradually cover the top of the sensor.

    3. Check that the lights go off under the following conditions.
      1. Light control switch is OFF.
      2. The area around the sensor gets light.
      3. The driver's door is opened with the ignition switch OFF.
  14. INSPECT LIGHTS-ON CONDITION 
    1. Open the driver's door while the ignition switch is OFF.
    2. Turn the light control switch to AUTO as leaving the door open, and cover the top of the sensor to check that the lights comes on by turning the ignition switch to ON.
  15. Connector disconnected: 

    INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT 

    Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in Fig 11.

    HINT:

    • Ignition switch is ON.
    • Light control switch is in AUTO.
    • Around the vehicle is light.
    Fig 11: Identifying Automatic Light Control Sensor Connector Terminals (Wire Harness Side)
    G02993947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    AUTOMATIC LIGHT CONTROL SENSOR SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    6 - Ground Always Continuity
    3 - Ground Close the driver's door again while the ignition switch OFF No voltage
    3 - Ground Ignition switch position ON 5.2 - 9.0V

    If circuit is as specified, perform the inspection shown in  16 .

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

  16. Connector connected: 

    INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT 

    Connect the wire harness side connector to the sensor and inspect wire harness side connector from the back side, as shown in Fig 12.

    HINT:

    • Ignition switch is ON.
    • Light control switch is in AUTO.
    • Around the vehicle is light.
    Fig 12: Identifying Automatic Light Control Sensor Connector Terminals (Back Side)
    G02993948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    AUTOMATIC LIGHT CONTROL SENSOR SPECIFIED CONDITIONS

    Tester connection Condition Specified condition
    4 - Ground (CLTS - Body ground) Always Pulse generation
    3 - Ground (CLTB - Body ground) Ignition switch ON 10 - 14V

    If circuit is as specified, inspect the circuit (See CIRCUIT INSPECTION ).

    If the circuits is not as specified, replace the sensor with a new one.

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