AIR CONDITIONING SYSTEM > Back-up Power Source Circuit

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DESCRIPTION

The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when turning the engine switch off and is used for diagnostic trouble code memory, etc.

WIRING DIAGRAM


E109494E01


INSPECTION PROCEDURE

1.INSPECT FUSE (A/C)

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

  1. Measure the resistance of the fuse.


Standard resistance:

Tester Item
Condition
Specified Condition
A/C fuse
Always
Below 1 Ω



NG
CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK


2.INSPECT AIR CONDITIONING AMPLIFIER (A/C AMPLIFIER - BODY GROUND)
E107331E08

  1. Disconnect the L52 A/C amplifier connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L52-1 (B) - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE