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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 the power switch is turned off. The power is used for diagnostic trouble code memory etc.

WIRING DIAGRAM


E183224E04


INSPECTION PROCEDURE

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

1.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)


    E177002E71

  1. Disconnect the A/C amplifier connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L17-21 (B) - Body ground
    		Power switch off
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to A/C Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND)


    E177002E72

  1. Disconnect the A/C amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L17-14 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to A/C Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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