FixVault
Home › Lexus › 2009 › LS 460L AWD › 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 Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream 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: except Ottoman

      *2: for Ottoman

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

      Standard resistance 

      except Ottoman: 

      SPECIFIED CONDITION CHART

      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

      for Ottoman: 

      SPECIFIED CONDITION CHART

      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 

      except Ottoman: 

      VOLTAGE SPECIFICATION

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

      for Ottoman: 

      SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      L76-21 (LIN3) or S15-13 (RCLN) - Body ground Always Below 1 V
      Fig 1: Identifying L76 Amplifier Connector Terminal
      G06198391Courtesy 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: except Ottoman

      *2: for Ottoman

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

      Standard resistance 

      except Ottoman: 

      SPECIFIED CONDITION CHART

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

      for Ottoman: 

      SPECIFIED CONDITION CHART

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

      Standard voltage 

      except Ottoman: 

      VOLTAGE SPECIFICATION

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

      for Ottoman: 

      SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S15-6 (B) - Body ground Always 11 to 14 V
      Fig 2: Identifying Terminals Of R2*1 Or S15*2 Module Switch Connector
      G05849808Courtesy 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 REMOVAL ).
    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) 

About FixVault