AIR CONDITIONING SYSTEM > Back-up Power Source Circuit

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DESCRIPTION

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

WIRING DIAGRAM


E109244E03


INSPECTION PROCEDURE

1.INSPECT ECU-B NO.1 FUSE

  1. Remove the ECU-B No.1 fuse from the fusible link block.

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

    Resistance:

    Tester item
    		Condition
    		Specified condition
    ECU-B No.1 fuse
    		Always
    		Below 1 Ω



NG
REPLACE ECU-B NO.1 FUSE
OK


2.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    E109265E30

  1. Remove the A/C amplifier assembly with the connectors still connected.

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A11-2 (B) - A11-6 (GND)
    		Always
    		10 to 14 V



NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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


    E109218E23

  1. Disconnect the connector from the A/C amplifier assembly.

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A11-2 (B) - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    E109218E24

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A11-6 (GND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY