LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 292 (Can Communication System) >> Can Communication System >> CAN Bus Line >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  • After the ignition switch is turned off, check that the key reminder warning system is not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

    HINT:

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

  1. CHECK CAN BUS LINE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT) 
    1. Turn the ignition switch OFF.
      Fig 1: Identifying DLC3 Connector Terminals
      G05115265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition Proceed to
      E1-6 (CANH) - E1-14 (CANL) Ignition switch OFF 54 to 69 Ω OK
      E1-6 (CANH) - E1-14 (CANL) Ignition switch OFF 69 Ω or more NG-A
      E1-6 (CANH) - E1-14 (CANL) Ignition switch OFF 54 Ω or less NG-B

    NG-A: CHECK CAN MAIN WIRE (FOR OPEN CIRCUIT) 

    NG-B: CHECK CAN BUS LINE (FOR SHORT CIRCUIT) 

    OK: Go to next step. 

  2. CHECK CAN BUS LINE (FOR SHORT TO +B) 
    1. Turn the ignition switch OFF.
    2. Measure the resistance.

      Result 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition Proceed to
      E1-6 (CANH) - E1-16 (BAT) Ignition switch OFF 1 Ω or more OK
      E1-14 (CANL) - E1-16 (BAT) Ignition switch OFF 1 Ω or more OK
      E1-6 (CANH) - E1-16 (BAT) Ignition switch OFF Below 1 Ω NG
      E1-14 (CANL) - E1-16 (BAT) Ignition switch OFF Below 1 Ω NG
      Fig 2: Identifying DLC3 Connector Terminals
      G05115266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK CAN BUS LINE (FOR SHORT TO +B) 

    OK: Go to next step. 

  3. CHECK CAN BUS LINE (FOR SHORT TO GND) 
    1. Turn the ignition switch OFF.
    2. Measure the resistance.

      Result 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition Proceed to
      E1-6 (CANH) - E1-4 (CG) Ignition switch OFF 1 Ω or more OK
      E1-14 (CANL) - E1-4 (CG) Ignition switch OFF 1 Ω or more OK
      E1-6 (CANH) - E1-4 (CG) Ignition switch OFF Below 1 Ω NG
      E1-14 (CANL) - E1-4 (CG) Ignition switch OFF Below 1 Ω NG
      Fig 3: Identifying DLC3 Connector Terminals
      G05115267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK CAN BUS LINE (FOR SHORT TO GND) 

    OK: HOW TO PROCEED WITH TROUBLESHOOTING 

scientia non olet · About LEMON Manuals