CAN COMMUNICATION SYSTEM > Air Conditioning Amplifier Communication Stop Mode

for Preparation Click here


DESCRIPTION


Detection Item
Symptom
Trouble Area
Air Conditioning Amplifier Communication Stop Mode
  1. "Air Conditioner" not displayed on "Communication Bus Check" screen of intelligent tester
  2. Applies to "Air Conditioning Amplifier Communication Stop Mode" in "DTC combination table"
  1. Power source circuit of air conditioning amplifier assembly
  2. Air conditioning amplifier assembly branch wire or connector
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


E175974E01


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuit related to this system before performing the following inspection procedure.
  2. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  3. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  4. 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.SYSTEM CHECK

  1. Check the vehicle specifications.
    Result 
    Result
    		Proceed to
    for automatic air conditioning system
    		A
    for manual air conditioning system
    		B



B
Go to step 4
A


2.CHECK FOR OPEN IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    E175975E01

  1. Turn the ignition switch off.

  1. Disconnect the D15 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D15-11 (TX+) - D15-12 (TX-)
    		Ignition switch off
    		54 to 69 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)

  1. Reconnect the air conditioning amplifier assembly connector.



NG
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK


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


    E175975E02

  1. Disconnect the D15 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D15-14 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D15-1 (IG+) - Body ground
    		Ignition switch ON
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)

  1. Reconnect the air conditioning amplifier assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)  

4.CHECK FOR OPEN IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    E175976E01

  1. Turn the ignition switch off.

  1. Disconnect the D16 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-8 (TX+) - D16-9 (TX-)
    		Ignition switch off
    		54 to 69 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)

  1. Reconnect the air conditioning amplifier assembly connector.



NG
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK


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


    E175976E02

  1. Disconnect the D16 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-24 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D16-14 (IG+) - Body ground
    		Ignition switch ON
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)

  1. Reconnect the air conditioning amplifier assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)