AFS ECU Power Source Circuit

DESCRIPTION

This circuit detects the state of the ignition switch and send it to the AFS ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT FUSE

1. Inspect the ECU-IG No.2 fuse and AM1 fuse in the instrument panel junction block assembly.

   Resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

2. INSPECT RELAY

1. Remove the IG1 relay from the instrument panel J/B assembly.

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

   Resistance:

   Tester connection	Condition	Specified resistance
   3 - 5	Always	10 kΩ or higher
   3 - 5	Apply B+ between the terminal 1 and 2	Below 1 Ω

NG	REPLACE RELAY

OK

3. INSPECT AFS ECU

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

   Voltage:

   Tester connection	Condition	Specified condition
   A17-2 (IG) - A17-1 (E1)	Ignition switch OFF → ON	Below 1 V → 10 to 14 V
   A17-12 (IGS) - A17-1 (E1)	Ignition switch OFF → ON	Below 1 V → 10 to 14 V

NG	Go to step 4

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND)

1. Disconnect the A17 connector from headlight swivel ECU assembly.

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

   Resistance:

   Tester connection	Condition	Specified condition
   A17-1 (E1) - Body ground	Always	Below 1 Ω
   A17-11 (E1S) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5. INSPECT INSTRUMENT PANEL J/B ASSEMBLY

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

   Voltage:

   Tester connection	Condition	Specified condition
   1F-19 - Body ground	Ignition switch OFF → ON	Below 1 V → 10 to 14 V

NG	Go to step 6

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - AFS ECU)

6. INSPECT INSTRUMENT PANEL J/B ASSEMBLY (POWER SOURCE CIRCUIT)

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

   Voltage:

   Tester connection	Condition	Specified condition
   1A-1 - Body ground	Always	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL J/B ASSEMBLY)

OK

7. INSPECT IGNITION SWITCH

1. Disconnect the ignition switch connector.

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

   Resistance:

   Tester connection	Condition	Specified condition
   2 - 4	Ignition switch OFF	10 kΩ or higher
   2 - 4	Ignition switch ON	Below 1 Ω

NG	REPLACE IGNITION SWITCH

OK

8. INSPECT INSTRUMENT PANEL J/B ASSEMBLY

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

   Voltage:

   Tester connection	Condition	Specified condition
   1I-4 - Body ground	Always	10 to 14 V

NG	REPLACE INSTRUMENT PANEL J/B ASSEMBLY

OK

9. INSPECT INSTRUMENT PANEL J/B ASSEMBLY

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

   Voltage:

   Tester connection	Condition	Specified condition
   1I-9 - Body ground	Ignition switch OFF → ON	Below 1 V → 10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BODY GROUND)

1. Disconnect the 1F connector from the instrument panel junction block assembly.

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

   Resistance:

   Tester connection	Condition	Specified condition
   1F-10 - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE INSTRUMENT PANEL J/B ASSEMBLY