CAN COMMUNICATION SYSTEM > Air Conditioning Amplifier Communication Stop Mode

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DESCRIPTION


Detection Item
Symptom
Trouble Area
Air Conditioning Amplifier Communication Stop Mode
Either condition is met:
  1. "Air Conditioner" is not displayed on "Bus Check".
  2. "Air Conditioning Amplifier Communication Stop Mode" in "DTC Combination Table" applies.
  1. Power source or inside air conditioning amplifier
  2. Air conditioning amplifier branch wire or connector
  3. Air conditioning amplifier

WIRING DIAGRAM


C129192E42


C129193E08


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance of the main wire and the branch wire.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder buzzer are not in operation.
  3. Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or 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.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

  1. Disconnect the cable from the negative (-) battery terminal before measuring the resistance of the main wire and the branch wire.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    NOTICE:
    1. w/ Navigation System (for HDD):
      After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.
    2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

NEXT


2.CHECK CAN BUS LINE FOR DISCONNECTION (AIR CONDITIONING AMPLIFIER BRANCH WIRE)


    C128050E22

  1. Disconnect the E41*1 or E42*2 air conditioning amplifier connector.

    1. *1: for Automatic Air Conditioning System
    2. *2: for Manual Air Conditioning System

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for Automatic Air Conditioning System:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E41-11 (CANH) - E41-12 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    for Manual Air Conditioning System:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E42-8 (CANH) - E42-9 (CANL)
    		Ignition switch off
    		54 to 69 Ω


NG
REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK


3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)

  1. Connect the cable to the negative (-) battery terminal.

    NOTICE:
    When disconnecting the cable, some systems need to be initialized after the cable is reconnected.


    C128050E23

  1. Disconnect the E41*1 or E42*2 air conditioning amplifier connectors.

    1. *1: for Automatic Air Conditioning System
    2. *2: for Manual Air Conditioning System

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for Automatic Air Conditioning System:
    Tester Connection
    		Condition
    		Specified Condition
    E41-14 (GND) - Body ground
    		Always
    		Below 1 Ω
    for Manual Air Conditioning System:
    Tester Connection
    		Condition
    		Specified Condition
    E42-24 (GND) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    for Automatic Air Conditioning System:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E41-21 (B) - Body ground
    		Always
    		11to 14 V
    E41-1 (IG+) - Body ground
    		Ignition switch on (IG)
    		11to 14 V
    for Manual Air Conditioning System:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E42-14 (IG+) - Body ground
    		Ignition switch on (IG)
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER