AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) > Back-up Power Source Circuit

for Preparation Click here


DESCRIPTION

This is the back-up power source circuit for the air conditioning amplifier. Power is supplied even when the ignition switch is turned off, and is used for functions such as the diagnostic trouble code memory.

WIRING DIAGRAM


E118638E03


INSPECTION PROCEDURE

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

1.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)


    E118637E22

  1. Disconnect the D15 air conditioning amplifier connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D15-21 (B) - Body ground
    		Always
    		11 to 14 V

  1. Reconnect the air conditioning amplifier connector.
    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Air Conditioning Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND)


    E118637E23

  1. Disconnect the D15 air conditioning amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D15-14 (GND) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the air conditioning amplifier connector.
    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Air Conditioning Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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