AIR CONDITIONING SYSTEM > Heater Relay Circuit

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DESCRIPTION

The heater relay is turned on by signals from the A/C amplifier assembly. It supplies power to the blower motor controller.

WIRING DIAGRAM


E109247E02


INSPECTION PROCEDURE

1.CHECK HEATER FUSE

  1. Remove the HEATER fuse from the instrument panel J/B.

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

    Resistance:

    Tester item
    		Condition
    		Specified condition
    HEATER fuse
    		Always
    		Below 1 Ω



NG
REPLACE HEATER FUSE
OK


2.INSPECT HEATER RELAY


    E032993

  1. Remove the HEATER relay from R/B No.3.

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    3 - 5
    		Always
    		10 kΩ or higher
    3 - 5
    		When battery voltage applied to terminals 1 and 2
    		Below 1 Ω
    3 - 4
    		Always
    		Below 1 Ω
    3 - 4
    		When battery voltage applied to terminals 1 and 2
    		10 kΩ or higher



NG
REPLACE HEATER RELAY
OK


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

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



    E109218E20

  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
    A11-18 (HR) - Body ground
    		Ignition switch position OFF
    Blower switch position OFF
    		Below 1 V
    A11-18 (HR) - Body ground
    		Ignition switch position ON
    Blower switch position ON
    		Below 1 V
    A11-18 (HR) - Body ground
    		Ignition switch position ON
    Blower switch position OFF
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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