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Inspection Procedure

HINT:

Operating the engine 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 engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
  2. CHECK FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE) 
    1. Disconnect the L97 No. 2 junction connector connector.
      Fig 1: Identifying L31 Connector Terminals
      G04953654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L31-6 (CANH) - L31-14 (CANL) Engine switch off 1 Ω or higher OK
      L31-6 (CANH) - L31-14 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL) 

    OK: GO TO NEXT STEP 

  3. CONNECT CONNECTOR 
    1. Reconnect the L97 No. 2 junction connector connector.
  4. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE) 
    1. Disconnect the A67 No. 1 junction connector connector.
      Fig 2: Identifying L31 Connector Terminals
      G04953654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      L31-6 (CANH) - L31-14 (CANL) Engine switch off 108 to 132 Ω

    NG: Go to step   9 

    OK: GO TO NEXT STEP 

  5. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 3: Identifying A67 No 1 Junction Connector Terminals
      G04953667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      A67-10 (CANH) - A67-21 (CANL) Engine switch off 1 Ω or higher OK
      A67-10 (CANH) - A67-21 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   7 

    OK: GO TO NEXT STEP 

  6. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying A67 No 1 Junction Connector Terminals
      G04953668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      A67-9 (CANH) - A67-20 (CANL) Engine switch off 108 to 132 Ω

    NG: Go to step   8 

    OK: REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR 

  7. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU) 
    1. Disconnect the A21 skid control ECU connector.
      Fig 5: Identifying A67 No 1 Junction Connector Terminals
      G04953669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      A67-10 (CANH) - A67-21 (CANL) Engine switch off 1 Ω or higher OK
      A67-10 (CANH) - A67-21 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU (CANH, CANL) 

    OK: REPLACE SKID CONTROL ECU  (See REMOVAL )

  8. CHECK FOR SHORT IN CAN BUS WIRES (ECM) 
    1. Disconnect the A13 ECM connector.
      Fig 6: Identifying A67 No 1 Junction Connector Terminals
      G04953668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      A67-9 (CANH) - A67-20 (CANL) Engine switch off 1 Ω or higher OK
      A67-9 (CANH) - A67-20 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANH, CANL) 

    OK: REPLACE ECM  (See REMOVAL )

  9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) 
    1. Disconnect the L97 No. 2 junction connector connector.
      Fig 7: Identifying L97 No 2 Junction Connector Terminals
      G04953671Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-4 (CANH) - L97-15 (CANL) Engine switch off 1 Ω or higher OK
      L97-4 (CANH) - L97-15 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) 

    OK: GO TO NEXT STEP 

  10. CONNECT CONNECTOR 
    1. Reconnect the A67 No. 1 junction connector connector.
    2. Reconnect the L97 No. 2 junction connector connector.
  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR SIDE) 
    1. Disconnect the L98 No. 3 junction connector connector.
      Fig 8: Identifying L31 Connector Terminals
      G04953654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      L31-6 (CANH) - L31-14 (CANL) Engine switch off 108 to 132 Ω

    NG: Go to step   24 

    OK: GO TO NEXT STEP 

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - AFS ECU) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 9: Identifying L98 No 3 Junction Connector Terminals
      G04953673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-11 (CANH) - L98-22 (CANL) Engine switch off 1 Ω or higher OK
      L98-11 (CANH) - L98-22 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   18 

    OK: GO TO NEXT STEP 

  13. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DISPLAY AND NAVIGATION OR MULTI-DISPLAY) 
    NOTE: For vehicles without multi-display, go to "CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - INTEGRATION CONTROL AND PANEL ASSEMBLY)".
    1. Measure the resistance according to the value(s) in the table below.
      Fig 10: Identifying L98 No 3 Junction Connector Terminals
      G04953674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-9 (CANH) - L98-20 (CANL) Engine switch off 1 Ω or higher OK
      L98-9 (CANH) - L98-20 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   19 

    OK: GO TO NEXT STEP 

  14. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - INTEGRATION CONTROL AND PANEL ASSEMBLY) 
    NOTE: For vehicles with multi-display, go to "CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - ELECTRIC POWER CONTROL ECU)".
    1. Measure the resistance according to the value(s) in the table below.
      Fig 11: Identifying L98 No 3 Junction Connector Terminals
      G04953674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-9 (CANH) - L98-20 (CANL) Engine switch off 1 Ω or higher OK
      L98-9 (CANH) - L98-20 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   20 

    OK: GO TO NEXT STEP 

  15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - ELECTRIC POWER CONTROL ECU) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 12: Identifying L98 No 3 Junction Connector Terminals
      G04953676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-6 (CANH) - L98-17 (CANL) Engine switch off 1 Ω or higher OK
      L98-6 (CANH) - L98-17 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   21 

    OK: GO TO NEXT STEP 

  16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 13: Identifying L98 No 3 Junction Connector Terminals
      G04953677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-10 (CANH) - L98-21 (CANL) Engine switch off 1 Ω or higher OK
      L98-10 (CANH) - L98-21 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   22 

    B: GO TO NEXT STEP 

  17. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 14: Identifying L98 No 3 Junction Connector Terminals
      G04953678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      L98-8 (CANH) - L98-19 (CANL) Engine switch off 108 to 132 Ω

    NG: Go to step   23 

    OK: REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR 

  18. CHECK FOR SHORT IN CAN BUS WIRES (AFS ECU) 
    1. Disconnect the A37 AFS ECU connector.
      Fig 15: Identifying L98 No 3 Junction Connector Terminals
      G04953673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-11 (CANH) - L98-22 (CANL) Engine switch off 1 Ω or higher OK
      L98-11 (CANH) - L98-22 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AFS ECU (CANH, CANL) 

    OK: REPLACE AFS ECU  (See REMOVAL )

  19. CHECK FOR SHORT IN CAN BUS WIRES (DISPLAY AND NAVIGATION OR MULTI-DISPLAY) 
    1. Disconnect the L59 display and navigation (multi-display) connector.
      Fig 16: Identifying L98 No 3 Junction Connector Terminals
      G04953674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Display Type Result Proceed to
      L98-9 (CANH) - L98-20 (CANL) Engine switch off 1 Ω or higher w/ Navigation System (for HDD) OK A
      w/ Navigation System (for DVD) B
      w/o Navigation System C
      L98-9 (CANH) - L98-20 (CANL) Engine switch off Below 1 Ω All types NG D

    B: REPLACE MULTI-DISPLAY  (See REMOVAL )

    C: REPLACE MULTI-DISPLAY  (See REMOVAL )

    D: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DISPLAY AND NAVIGATION OR MULTI-DISPLAY (CANH, CANL) 

    A: REPLACE DISPLAY AND NAVIGATION ASSEMBLY  (See REMOVAL )

  20. CHECK FOR SHORT IN CAN BUS WIRES (INTEGRATION CONTROL AND PANEL ASSEMBLY) 
    1. Disconnect the L35 integration control and panel connector.
      Fig 17: Identifying L98 No 3 Junction Connector Terminals
      G04953674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-9 (CANH) - L98-20 (CANL) Engine switch off 1 Ω or higher OK
      L98-9 (CANH) - L98-20 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO INTEGRATION CONTROL AND PANEL ASSEMBLY (CANH, CANL) 

    OK: REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY  (See REMOVAL )

  21. CHECK FOR SHORT IN CAN BUS WIRES (ELECTRIC POWER CONTROL ECU) 
    1. Disconnect the A69 electric power control ECU connector.
      Fig 18: Identifying L98 No 3 Junction Connector Terminals
      G04953676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-6 (CANH) - L98-17 (CANL) Engine switch off 1 Ω or higher OK
      L98-6 (CANH) - L98-17 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ELECTRIC POWER CONTROL ECU (CANH, CANL) 

    OK: REPLACE ELECTRIC POWER CONTROL ECU 

  22. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the L77 air conditioning amplifier connector.
      Fig 19: Identifying L98 No 3 Junction Connector Terminals
      G04953677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-10 (CANH) - L98-21 (CANL) Engine switch off 1 Ω or higher OK
      L98-10 (CANH) - L98-21 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CANH, CANL) 

    OK: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

  23. CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR) 
    1. Disconnect the L73 center airbag sensor connector.
      Fig 20: Identifying L98 No 3 Junction Connector Terminals
      G04953678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L98-8 (CANH) - L98-19 (CANL) Engine switch off 1 Ω or higher OK
      L98-8 (CANH) - L98-19 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO CENTER AIRBAG SENSOR (CANH, CANL) 

    OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY  (See REMOVAL )

  24. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) 
    1. Disconnect the L97 No. 2 junction connector connector.
      Fig 21: Identifying L97 No 2 Junction Connector Terminals
      G04953685Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-1 (CANH) - L97-12 (CANL) Engine switch off 1 Ω or higher OK
      L97-1 (CANH) - L97-12 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) 

    OK: GO TO NEXT STEP 

  25. CONNECT CONNECTOR 
    1. Reconnect the L98 No. 3 junction connector connector.
  26. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 22: Identifying L97 No 2 Junction Connector Terminals
      G04953686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-3 (CANH) - L97-14 (CANL) Engine switch off 1 Ω or higher OK
      L97-3 (CANH) - L97-14 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   28 

    OK: GO TO NEXT STEP 

  27. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 1 METER ECU) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 23: Identifying L97 No 2 Junction Connector Terminals
      G04953687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-5 (CANH) - L97-16 (CANL) Engine switch off 1 Ω or higher OK
      L97-5 (CANH) - L97-16 (CANL) Engine switch off Below 1 Ω NG

    NG: Go to step   29 

    OK: REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR 

  28. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) 
    1. Disconnect the L11 main body ECU connector.
      Fig 24: Identifying L97 No 2 Junction Connector Terminals
      G04953688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-3 (CANH) - L97-14 (CANL) Engine switch off 1 Ω or higher OK
      L97-3 (CANH) - L97-14 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CANH, CANL) 

    OK: REPLACE MAIN BODY ECU 

  29. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 METER ECU) 
    1. Disconnect the L10 No. 1 meter ECU connector.
      Fig 25: Identifying L97 No 2 Junction Connector Terminals
      G04953687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Result 

      RESULT REFERENCE CHART

      Tester Connection Switch Condition Measured Resistance Proceed to
      L97-5 (CANH) - L97-16 (CANL) Engine switch off 1 Ω or higher OK
      L97-5 (CANH) - L97-16 (CANL) Engine switch off Below 1 Ω NG

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NO. 1 METER ECU (CANH, CANL) 

    OK: REPLACE COMBINATION METER ASSEMBLY (NO. 1 METER ECU SUB-ASSEMBLY)  (See DISASSEMBLY )

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