AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) Heater Control Switch Circuit

DESCRIPTION

The No. 3 heater control sub-assembly is powered through the HTR-IG fuse. The No. 3 heater control sub-assembly transmits operational signals of each switch to the air conditioning amplifier assembly.

WIRING DIAGRAM

A01TB6OE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT NO. 3 HEATER CONTROL SUB-ASSEMBLY


    1. A01TDAAC05
      *A w/ PTC Heater
      *a

      Component without harness connected

      (No. 3 Heater Control Sub-assembly)
      *b A/C Switch

      Measure the resistance.


      1. Remove the No. 3 heater control sub-assembly.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        2 (B) - 3 (A/C) A/C switch: On Below 1 Ω
        2 (B) - 3 (A/C) A/C switch: Off 10 kΩ or higher
        7 (B) - 8 (E)*1 MAX HOT switch: On Below 1 Ω
        7 (B) - 8 (E)*1 MAX HOT switch: Off 10 kΩ or higher

        • *1: w/ PTC heater

    2. Check the indicator light.


      1. Turn the A/C switch on.

      2. Connect a positive (+) lead from the battery to terminal 2 (B) and a negative (-) lead to terminal 4 (AIND), and check that the indicator light comes on.

        OK
        The indicator light comes on.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 3 HEATER CONTROL SUB-ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - IG POWER SOURCE)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E65-2 (B) - Body ground Ignition switch ON 11 to 14 V
      E65-2 (B) - Body ground Ignition switch off Below 1 V
      E65-7 (B) - Body ground*1 Ignition switch ON 11 to 14 V
      E65-7 (B) - Body ground*1 Ignition switch off Below 1 V

      • *1: w/ PTC heater

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the E62 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E65-3 (A/C) - E62-2 (A/C) Always Below 1 Ω
      E65-4 (AIND) - E62-16 (LED) Always Below 1 Ω
      E65-8 (E) - E62-3 (HEAT)*1 Always Below 1 Ω
      E65-3 (A/C) - Body ground Always 10 kΩ or higher
      E65-4 (AIND) - Body ground Always 10 kΩ or higher
      E65-8 (E) - Body ground*1 Always 10 kΩ or higher

      • *1: w/ PTC heater

      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR