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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
  2. CHECK FOR OPEN IN CAN BUS WIRE (CENTER AIRBAG SENSOR BRANCH WIRE) 
    1. Disconnect the J46 center airbag sensor connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Switch Condition Specified Condition
      J46-13 (CANH) - J46-22 (CANL) Ignition switch OFF 54 to 69 Ω
      Fig 1: Identifying J46 Center Airbag Sensor Connector
      G05163454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CENTER AIRBAG SENSOR BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - BATTERY AND BODY GROUND) 
    1. Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      J46-25 (E1) - Body ground Always Below 1 Ω
      J46-26 (E2) - Body ground
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE

      Tester Connection Switch Condition Specified Condition
      J46-21 (IG2) - Body ground Ignition switch ON 11 to 14 V
      Fig 2: Identifying J46 Center Airbag Sensor Connector Terminals
      G05163455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE CENTER AIRBAG SENSOR  (See REMOVAL )

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