IG Power Source Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: IG Power Source Circuit

IG Power Source Circuit

DESCRIPTION

This is the main power source supplied to the air conditioning amplifier when the power switch is turned ON (IG). The power source supplied is used for operating the air conditioning amplifier, servo motor, etc.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (A/C (HTR))
(a) Remove the A/C (HTR) fuse from the driver side junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK AIR CONDITIONING AMPLIFIER (IG VOLTAGE)




(a) Remove the air conditioning amplifier with connectors still connected.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

3. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)




(a) Measure the voltage of the wire harness side connector.
Standard voltage:





(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER