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

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT NO. 1 HEATER CONTROL

   
   

   1. Remove the No. 1 heater control sub-assembly Click here.

   2. Inspect the No. 1 heater control sub-assembly Click here.

   
   

   NG

   REPLACE NO. 1 HEATER CONTROL SUB-ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY - BATTERY)

   
   

   1. 

      Disconnect the F38 No. 1 heater control sub-assembly 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
      Text in Illustration *a Front view of wire harness connector (to No. 1 Heater Control)

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   

   1. Disconnect the F41 air conditioning amplifier assembly connector.

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

      Standard Resistance (Check for Open)
      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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition 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