LIN COMMUNICATION SYSTEM Rear Heater Control Panel LIN Communication Malfunction

DESCRIPTION

The LIN communication of the components related to the rear heater occurs between the air conditioning amplifier (A/C ECU) and rear power seat module switch.

WIRING DIAGRAM

A01GX3CE04

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the power switch off to troubleshoot:

    Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH)

    A01GYP2E04

    1. Disconnect the L76 amplifier connector.

    2. Disconnect the z54*1 or S15*2 module switch connector.

      Tech Tips

      *1: except 4-Passenger with Ottoman

      *2: for 4-Passenger with Ottoman

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

      Standard resistance
      except 4-Passenger with Ottoman:
      Tester Connection Condition Specified Condition
      L76-21 (LIN3) - z54-6 (RCLN) Always Below 1 Ω
      L76-21 (LIN3) or z54-6 (RCLN) - Body ground Always 10 kΩ or higher
      for 4-Passenger with Ottoman:
      Tester Connection Condition Specified Condition
      L76-21 (LIN3) - S15-9 (RCLN) Always Below 1 Ω
      L76-21 (LIN3) or S15-9 (RCLN) - Body ground Always 10 kΩ or higher
      Standard voltage
      except 4-Passenger with Ottoman:
      Tester Connection Switch Condition Specified Condition
      L76-21 (LIN3) or z54-6 (RCLN) - Body ground Power switch (IG) Below 1 V
      for 4-Passenger with Ottoman:
      Tester Connection Switch Condition Specified Condition
      L76-21 (LIN3) or S15-9 (RCLN) - Body ground Power switch (IG) Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - BATTERY AND BODY GROUND)


    1. A01H04DE13

      Disconnect the z54*1 or S15*2 module switch connector.

      Tech Tips

      *1: except 4-Passenger with Ottoman

      *2: for 4-Passenger with Ottoman

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

      Standard resistance
      except 4-Passenger with Ottoman:
      Tester Connection Condition Specified Condition
      z54-9 (E) - Body ground Always Below 1 Ω
      for 4-Passenger with Ottoman:
      Tester Connection Condition Specified Condition
      S15-1 (E) - Body ground Always Below 1 Ω
      Standard voltage
      except 4-Passenger with Ottoman:
      Tester Connection Switch Condition Specified Condition
      z54-14 (B) - Body ground Power switch on (IG) 11 to 14 V
      for 4-Passenger with Ottoman:
      Tester Connection Switch Condition Specified Condition
      S15-6 (B) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK REAR POWER SEAT MODULE SWITCH (OPERATION)


    1. Temporarily replace the rear power seat module switch with a new or normally functioning one .


    2. Check that the rear air conditioning function is normal.

      OK
      Rear air conditioning function is normal.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END (REAR POWER SEAT MODULE SWITCH IS DEFECTIVE)