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 ignition switch is turned on. This power source is used for operating components such as the air conditioning amplifier.

WIRING DIAGRAM





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

PROCEDURE

1. INSPECT FUSE (A/C)
(a) Remove the A/C fuse from the main body ECU.
(b) Measure the resistance.
Standard resistance:
Bellow 1 Ohms
(c) Reinstall the A/C fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
2. INSPECT AIR CONDITIONING AMPLIFIER




(a) Disconnect the E8 air conditioning amplifier connector.
(b) Measure the voltage.
Standard voltage:





(c) Reconnect the air conditioning amplifier connector.
NG -- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)
OK -- REPLACE AIR CONDITIONING AMPLIFIER
3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)




(a) Disconnect the E8 air conditioning amplifier connector.
(b) Disconnect the 4S main body ECU connector.
(c) Measure the resistance.
Standard resistance:





(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND)
(a) Disconnect the E8 air conditioning amplifier connector.




(b) Measure the resistance.
Standard resistance:





(c) Reconnect the air conditioning amplifier connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE