Lighting System (For Hatchback) Headlight Relay Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

INSPECT HEADLIGHT RELAY (H-LP/US-DRL RELAY)

INSPECT HEADLIGHT DIMMER RELAY (DIM RELAY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - BATTERY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - HEADLIGHT DIMMER RELAY)

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT RELAY AND HEADLIGHT DIMMER RELAY)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

INSPECT HEADLIGHT DIMMER RELAY (DIM RELAY)

INSPECT HEADLIGHT DIMMER RELAY (DIM RELAY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - HEADLIGHT DIMMER RELAY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Body Electrical / Main Body / Active Test.
   

5. According to the display on the Techstream, perform the Active Test.
   
   

   Main Body

   Tester Display	Test Part	Control Range	Diagnostic Note
   Headlight Relay	Headlight relay	OFF or ON	-
   Head Light Hi	Headlight dimmer relay	OFF or ON	Light control switch is in HEAD position

6. Check the illuminating condition of the low beam and high beam headlights.
   

   Result

   Result	Proceed to
   Low beam headlights and high beam headlights are normal.	A
   Low beam headlights and high beam headlights do not illuminate.	B
   Low beam headlights do not illuminate (High beam headlights are normal).	C
   High beam headlights do not illuminate (Low beam headlights are normal).	D

1. Inspect the headlight relay (H-LP/US-DRL relay) (YARIS_NCP93 RM000001Y5C00VX.html).
   

1. Inspect the headlight dimmer relay (DIM relay) (YARIS_NCP93 RM000001Y5C00VX.html).
   

1. Remove the headlight relay (H-LP/US-DRL relay) from the No. 2 engine room relay block.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   H-LP/US-DRL-1 - Body ground	Always	11 to 14 V
   H-LP/US-DRL-5 - Body ground	Always	11 to 14 V

   Text in Illustration

   *1	No. 2 Engine Room Relay Block
   *2	Headlight Rely (H-LP/US-DRL Relay) Holder

1. Remove the headlight relay (H-LP/US-DRL relay) from the No. 2 engine room relay block.
   

2. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H-LP/US-DRL-3 - DIM-2	Always	Below 1 Ω
   H-LP/US-DRL-3 - DIM-3	Always	Below 1 Ω
   H-LP/US-DRL-3 - Body ground	Always	10 kΩ or higher

1. Disconnect the 3C instrument panel junction block assembly connector.
   

2. Remove the headlight relay (H-LP/US-DRL relay) from the No. 2 engine room relay block.
   

3. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3C-18 - H-LP/US-DRL-2	Always	Below 1 Ω
   3C-35 - DIM-1	Always	Below 1 Ω
   3C-18 - Body ground	Always	10 kΩ or higher
   3C-35 - Body ground	Always	10 kΩ or higher

1. Remove the instrument panel junction block assembly.
   

2. Remove the main body ECU from the instrument panel junction block assembly.
   

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

   
   
   
   
   

   Text in Illustration

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3C-18 - MB-15 (HRLY)	Always	Below 1 Ω
   3C-35 - MB-22 (DIM)	Always	Below 1 Ω

1. Inspect the headlight dimmer relay (DIM relay) (YARIS_NCP93 RM000001Y5C00VX.html).
   

1. Inspect the headlight dimmer relay (DIM relay) (YARIS_NCP93 RM000001Y5C00VX.html).
   

1. Remove the headlight relay (H-LP/US-DRL relay) from the No. 2 engine room relay block.
   

2. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H-LP/US-DRL-3 - DIM-2	Always	Below 1 Ω
   H-LP/US-DRL-3 - Body ground	Always	10 kΩ or higher

1. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.
   

2. Disconnect the 3C instrument panel junction block assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   DIM-1 - 3C-35	Always	Below 1 Ω
   DIM-1 - Body ground	Always	10 kΩ or higher

1. Remove the instrument panel junction block assembly.
   

2. Remove the main body ECU from the instrument panel junction block assembly.
   

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

   
   
   
   
   

   Text in Illustration

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3C-35 - MB-22 (DIM)	Always	Below 1 Ω