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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Communication >> Lin Communication System >> Rear Heater Control Panel LIN Communication Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When using the intelligent tester (with CAN VIM) or Techstream with the engine switch off to troubleshoot:
Connect the intelligent tester (with CAN VIM) or Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.
  1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH) 
    1. Disconnect the L76 amplifier connector.
    2. Disconnect the r2*1 or S15*2 module switch connector.

      HINT:

      *1: w/o Ottoman

      *2: w/ Ottoman

    3. Measure the resistance and voltage according to the value(s) in the table below.

      Standard resistance 

      w/o Ottoman: 

      AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH RESISTANCE W/O OTTOMAN

      Tester Connection Condition Specified Condition
      L76-21 (LIN3)-r2-14 (RCLN) Always Below 1 Ω
      L76-21(LIN3)or r2-14 (RCLN) - Body ground Always 10 kΩ or higher

      w/ Ottoman: 

      AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH RESISTANCE W/OTTOMAN

      Tester Connection Condition Specified Condition
      L76-21 (LIN3)-S15-13 (RCLN) Always Below 1 Ω
      L76-21(LIN3) or S15-13 (RCLN) - Body ground Always 10 kΩ or higher

      Standard voltage 

      w/o Ottoman: 

      AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH VOLTAGE W/O OTTOMAN

      Tester Connection Condition Specified Condition
      L76-21 (LIN3) or r2-14 (RCLN) - Body ground Always Below 1 V

      w/ Ottoman: 

      AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH VOLTAGE W/OTTOMAN

      Tester Connection Condition Specified Condition
      L76-21(LIN3)or S15-13 (RCLN) - Body ground Always Below 1 V
      Fig 1: Identifying L76 Amplifier Connector
      G04947025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  2. CHECK REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND) 
    1. Disconnect the r2*1 or S15*2 module switch connector.

      HINT:

      *1: w/o Ottoman

      *2: w/ Ottoman

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard resistance 

      w/o Ottoman: 

      REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND) RESISTANCE W/OTTOMAN

      Tester Connection Condition Specified Condition
      r2-3 (E) - Body ground Always Below 1 Ω

      w/ Ottoman: 

      REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND) RESISTANCE W/OTTOMAN

      Tester Connection Condition Specified Condition
      S15-5 (E) - Body ground Always Below 1 Ω

      Standard voltage 

      w/o Ottoman: 

      REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND) VOLTAGE W/O OTTOMAN

      Tester Connection Condition Specified Condition
      r2-11 (B) - Body ground Always 11 to 14 V

      w/ Ottoman: 

      REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND) VOLTAGE W/OTTOMAN

      Tester Connection Condition Specified Condition
      S15-6 (B) - Body ground Always 11 to 14 V
      Fig 2: Identifying r2*1 Or s15*2 Module Switch Connectors
      G04947026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  3. REPLACE REAR POWER SEAT MODULE SWITCH (OPERATION) 
    1. Temporarily replace the rear power seat module switch with a new or normally functioning one (see DISASSEMBLY ).
    2. Check the rear air conditioning function is normal.

      OK: Rear air conditioning function is normal. 

    NG: REPLACE AIR CONDITIONING AMPLIFIER 

    OK: END (REAR POWER SEAT MODULE SWITCH IS DEFECTIVE) 

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