Headlamp: Description and Operation

System Description (USA)
The headlamp operation is controlled by the lighting switch which is built into the combination switch and headlamp battery saver control unit. And the headlamp battery saver system is controlled by the headlamp battery saver control unit and smart entrance control unit.

OUTLINE
Power is supplied at all times
- to headlamp LH relay terminals 1 and 5
- through 15 A fuse (No.68, located in the fuse and fusible link box), and
- to headlamp RH relay terminals 1 and 5
- through 15 A fuse (No.69, located in the fuse and fusible link box), and
- to smart entrance control unit terminal 49
- through 10 A fuse [No.13, located in the fuse block (J/B)].

When the ignition switch is in the ON or START position, power is supplied
- to smart entrance control unit terminal 27
- through 10 A fuse [No.10, located in the fuse block (J/B)].

When the ignition switch is in the ACC or ON position, power is supplied
- to smart entrance control unit terminal 26
- through 10 A fuse [No.1, located in the fuse block (J/B)]

Ground is supplied
- to smart entrance control unit terminals 43 and 64
- through body grounds M9, M25 and M87.

POWER SUPPLY TO LOW BEAM AND HIGH BEAM

When lighting switch is in 2ND or PASS position, ground is supplied
- to headlamp LH relay terminal 2 from smart entrance control unit terminal 21
- through smart entrance control unit terminal 22,
- from lighting switch terminal 12, and
- to headlamp RH relay terminal 2 from smart entrance control unit terminal 59
- through smart entrance control unit terminal 60,
- from lighting switch terminal 12.

Headlamp relays (LH and RH) are energized and then power is supplied to headlamps (LH and RH).

LOW BEAM OPERATION
When the lighting switch is turned to the 2ND position and placed in LOW ("B") position, power is supplied
- from terminal 3 of each headlamp relay
- to terminal 3 of each headlamp

Ground is supplied
- to headlamp LH terminal 2
- through lighting switch terminals 7 and 5
- through body grounds E11, E22 and E53, and
- to headlamp RH terminal 2
- through lighting switch terminal 10 and 8
- through body grounds E11, E22 and E53.

With power and ground supplied, the headlamp(s) will illuminate.

HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION

When the lighting switch is turned to the 2ND position and placed in HIGH ("A") position or PASS ("C") position,
power is supplied
- from terminal 3 of each headlamp relay
- to terminal 3 of each headlamp, and
- to combination meter terminal 26 for the HIGH BEAM indicator.

Ground is supplied
- to headlamp LH terminal 1
- through lighting switch terminals 6 and 5
- through body grounds E11, E22 and E53, and
- to headlamp RH terminal 1
- to combination meter terminal 27 for the HIGH BEAM indicator
- through lighting switch terminals 9 and 8
- through body grounds E11, E22 and E53.

With power and ground supplied, the high beams and the high beam indicator illuminate.

BATTERY SAVER CONTROL
Headlamps will remain on for a short while after the ignition switch is turned ON (or START) from OFF (or ACC).

Continuity between terminals 21 and 22, and between terminals 59 and 60 of smart entrance control unit will be disturbed after 45 seconds, then the headlamps will be turned off.

Then the headlamps are turned off.

The headlamps are turned off when driver or passenger side door is opened even if 45 seconds have not passed after ignition switch is turned from ON (or START) to OFF (or ACC) positions while headlamps are illuminated.

When the lighting switch is turned from OFF to 2ND after headlamps are turned to off by the battery saver control, ground is supplied
- to smart entrance control unit terminals 20 and 58 from lighting switch terminal 11, and then,
- to headlamp LH and RH relays terminal 2 from smart entrance control unit terminals 21 and 59,
- through smart entrance control unit terminals 22 and 60 and
- through lighting switch terminal 12.

Then headlamps illuminate again.

AUTO LIGHT OPERATION
The auto light control system has an optical sensor inside it that detects outside brightness. When lighting switch is in "AUTO" position, ground is supplied
- to smart entrance control unit terminal 23
- from lighting switch terminal 42.

When ignition switch is turn to "ON" or "START" position and Outside brightness is darker than prescribed level.

Ground is supplied
- to headlamp relay LH and RH terminals 2
- through smart entrance control unit terminal 21, 59 and 43, 64.

Then both headlamp relays and tail lamp relay are energized, headlamps (low or high) and tail lamps are illuminate according to switch position.

Auto light operation allows headlamps and tail lamps to go off when
- Ignition switch is turned to "OFF" position or
- Outside brightness is brighter than prescribed level.

NOTE: The delay time changes (maximum of 20 seconds) as the outside brightness changes

For parking license and tail lamp auto operation, refer to "PARKING, LICENSE AND TAIL LAMPS".

VEHICLE SECURITY SYSTEM
The vehicle security system will flash the high beams if the system is triggered. Refer to "VEHICLE SECURITY (THEFT WARNING) SYSTEM".