AIR CONDITIONING SYSTEM Back-up Power Source Circuit

DESCRIPTION

The back-up power source circuit for the air conditioning amplifier is shown below. Power is supplied even when turning the power switch OFF and is used for diagnostic trouble code memory, etc.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   INSPECT FUSE (A/C)

   
   

   1. Remove the A/C fuse from the passenger side junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition A/C fuse Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

   
   

   1. Disconnect the L76 air conditioning amplifier connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition L76-6 (+B1) - Body ground Always 11 to 14 V L76-7 (+B2) - Body ground

   
   
   • OKClick here
   • NGClick here
3. Click here

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

4. Click here

   REPLACE FUSE

5. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR