IG Power Source Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: IG Power Source Circuit
- IG Power Source Circuit

DESCRIPTION

The main power source is supplied to the A/C amplifier when the engine switch is on (IG).

The power source is used for operating the A/C amplifier and servomotor, etc.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

PROCEDURE

1. INSPECT FUSE (ECU-IG RH)

(a) Remove the ECU-IG RH fuse from the cowl side junction block RH.

(b) Measure the resistance of the fuse.

Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK -- Continue to next step.

2. INSPECT AIR CONDITIONING AMPLIFIER (IG+ - GND)





(a) Remove the A/C amplifier with its connectors still connected.

(b) Turn the engine switch on (IG).

(c) Measure the voltage of the connector.

Standard voltage:





NG -- CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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





(a) Disconnect the K52 A/C amplifier connector.

(b) Measure the voltage of the wire harness side connector.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND)





(a) Disconnect the K52 A/C amplifier connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER