IG Power Source Circuit

DESCRIPTION

The main power source is supplied to the A/C amplifier when the engine switch on (IG).
The power source is used for operating the A/C amplifier and servo motor, etc.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

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

1. INSPECT FUSE (ECU-IG LH)

1. Remove the ECU-IG LH fuse from the cowl side junction block LH.

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

   Standard resistance:

   Tester Item	Condition	Specified Condition
   ECU-IG LH fuse	Always	Below 1 Ω

NG	REPLACE FUSE (ECU-IG LH)

OK

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

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

2. Turn the engine switch on (IG).

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   J58-21 (IG+) - J58-20 (GND)	Engine switch on (IG)	10 to 14 V

NG	Go to step 3

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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

1. Disconnect the A/C amplifier connector.

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   J58-21 (IG+) - Body ground	Engine switch off	Below 1 V
   	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

1. Disconnect the A/C amplifier connector.

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J58-20 (GND) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE AIR CONDITIONING AMPLIFIER