Lighting System Headlight Relay Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (H-LP MAIN)
INSPECT ENGINE ROOM RELAY BLOCK
INSPECT HEADLIGHT RELAY (H-LP)
CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY)
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - FUSE)
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - DAYTIME RUNNING LIGHT RELAY)
LIGHTING SYSTEM - Headlight Relay Circuit |
DESCRIPTION
- The daytime running light relay receives the light control switch HEAD signal and the ambient light level signal from the automatic light control sensor to control the headlight relay.
- HINT:
- If only a low beam headlight bulb on one side does not illuminate, inspect the bulb, fuse, or wire harness related to the bulb.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT FUSE (H-LP MAIN) |
Remove the H-LP MAIN fuse from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
H-LP MAIN fuse
| Always
| Below 1 Ω
|
| 2.INSPECT ENGINE ROOM RELAY BLOCK |
Install the H-LP MAIN fuse to the engine room relay block.
Remove the H-LP LH LO fuse and H-LP RH LO fuse from the engine room relay block.
Measure the voltage between the loading slot of each fuse and body ground.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
H-LP LH LO fuse terminal - Body ground
| Light control switch OFF → HEAD
| Below 1 V → 11 to 14 V
|
H-LP RH LO fuse terminal - Body ground
| Light control switch OFF → HEAD
| Below 1 V → 11 to 14 V
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND) |
|
| 3.INSPECT HEADLIGHT RELAY (H-LP) |
Remove the headlight relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
3 - 5
| Voltage is not applied between terminals 1 and 2
| 10 kΩ or higher
|
3 - 5
| Voltage is applied between terminals 1 and 2
| Below 1 Ω
|
| 4.CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY) |
Measure the voltage on the relay block side according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
Headlight relay terminal 5 - Body ground
| Always
| 11 to 14 V
|
Headlight relay terminal 1 - Body ground
| Always
| 11 to 14 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - FUSE) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
Headlight relay terminal 3 - H-LP LH LO fuse terminal
| Always
| Below 1 Ω
|
Headlight relay terminal 3 - H-LP RH LO fuse terminal
| Always
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 6.CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - DAYTIME RUNNING LIGHT RELAY) |
Disconnect the E91 daytime running light relay connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
Headlight relay terminal 2 - E91-4 (H-LP)
| Always
| Below 1 Ω
|
E91-4 (H-LP) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
