Headlight Beam Level Control ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the headlight beam level control ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT FUSE

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

   Resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

2. INSPECT RELAY

1. Inspect IG1 relay continuity.

   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 HEADLIGHT BEAM LEVEL CONTROL ECU

1. Disconnect the H17 connector of headlight beam level control ECU.

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

   Voltage:

   Tester connection	Condition	Specified condition
   H17-14 (IG) - H17-1 (GND)	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 (HEADLIGHT BEAM LEVEL CONTROL ECU - BODY GROUND)

1. Disconnect the H17 connector of headlight beam level control ECU.

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

   Resistance:

   Tester connection	Condition	Specified condition
   H17-1 (GND) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK 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

6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK 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 7

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

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 resistance
   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 JUNCTION BLOCK 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 JUNCTION BLOCK ASSEMBLY

OK

9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK 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 JUNCTION BLOCK ASSEMBLY