CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) Air Conditioning Amplifier Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Air Conditioning Amplifier Communication Stop Mode

Either condition is met:


  • "Air Conditioning Amplifier" is not displayed on "Bus Check".

  • "Air Conditioning Amplifier Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside Air conditioning amplifier assembly

  • Air conditioning amplifier assembly branch wire or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01VEJRE08

CAUTION / NOTICE / HINT

Note


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

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

  • After the ignition switch is turned off, check that the key reminder warning system are not operating.

  • 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 any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


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


    1. A01VKGSE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly (w/ Automatic Air Conditioning System))
      *b

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly (w/ Manual Air Conditioning System or PTC Heater))

      Disconnect the F42*1 or F41*2 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition

      F42-11 (TX+) - F42-12 (TX-)*1

      F41-8 (TX+) - F41-9 (TX-)*2

      		 Ignition switch off 54 to 69 Ω

      *1 : w/ Automatic Air Conditioning System

      *2 : w/ Manual Air Conditioning System or PTC Heater


    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01VKX0E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly (w/ Automatic Air Conditioning System))
    *b

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly (w/ Manual Air Conditioning System or PTC Heater))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition

      F42-1 (IG+) - Body ground*1

      F41-1 (IG+) - Body ground*2

      		 Ignition switch ON 11 to 14 V
      F42-21 (B) - Body ground*1 Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F42-14 (GND) - Body ground*1

      F41-23 (GND) - Body ground*2

      		 Always Below 1 Ω

      *1 : w/ Automatic Air Conditioning System

      *2 : w/ Manual Air Conditioning System or PTC Heater


    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)