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

DESCRIPTION

The No. 1 heater control sub-assembly (A/C switch, A/C LED) is powered through the A/C fuse. The No. 1 heater control sub-assembly (A/C switch, A/C LED) transmits operational signals of each switch to the air conditioning amplifier assembly.

WIRING DIAGRAM

A00474SE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT NO. 1 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED)


    1. Inspect the No. 1 heater control sub-assembly (A/C switch, A/C LED) Click here.


    NG

    REPLACE NO. 1 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED) - IG1 NO. 1 RELAY)


    1. A004ASHE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Heater Control Sub-Assembly (A/C Switch, A/C LED))

      Disconnect the F38 No. 1 heater control sub-assembly (A/C switch, A/C LED) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F38-2 (L) - Body ground Ignition switch off Below 1 V
      F38-2 (L) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the F38 No. 1 heater control sub-assembly (A/C switch, A/C LED) connector.

    2. Disconnect the F41 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F38-3 (E) - F41-16 (LED) Always Below 1 Ω
      F38-4 (B) - F41-2 (A/C) Always Below 1 Ω
      F38-3 (E) - Body ground Always 10 kΩ or higher
      F38-4 (B) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR