CAN COMMUNICATION SYSTEM (for LHD) > Air Conditioning Amplifier Communication Stop Mode

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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 the air conditioning amplifier
  2. Air conditioning amplifier branch wire or connector
  3. Air conditioning amplifier

WIRING DIAGRAM


C133239E01


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance of the CAN main wire and CAN branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and lighting system are not operating.
  3. 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 other switches or any triggers related ECU and sensor communication on the CAN, which would cause resistance reading variations.
1.CHECK CAN BUS LINE FOR DISCONNECTION (AIR CONDITIONING AMPLIFIER BRANCH WIRE)


    E124470E21

  1. Turn the ignition switch off.

  1. Disconnect the air conditioning amplifier connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E38-11 (CANH) - E38-12 (CANL)
    		Ignition Switch off
    		54 to 69 Ω


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)
OK


2.CHECK HARNESS AND CONNECTOR (IG+, B, GND)


    E124470E22

  1. Disconnect the air conditioning amplifier connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E38-14 (GND) - Body Ground
    		Always
    		Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E38-1 (IG+) - Body Ground
    		Ignition Switch on
    		10 to 14 V
    E38-21 (B) - Body Ground
    		Always
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER