Headlamp (USA)

System Description (USA) - Xenon Type
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 3
- through 15 A fuse (No.60, located in the fuse and fusible link box), and
- to headlamp LH relay terminal 6
- through 20 A fuse (No.32, located in the fuse and fusible link box), and
- to headlamp RH relay terminals 1 and 3
- through 15 A fuse (No.59, located in the fuse and fusible link box), and
- to headlamp RH relay terminal 6
- through 20 A fuse (No.31, located in the fuse and fusible link box), and
- to headlamp battery saver control unit terminal 7, and
- to smart entrance control unit terminal 10
- through 7.5 A fuse [No.24, located in the fuse block (J/B)].

When the ignition switch is in the ON or START position, power is supplied
- to headlamp battery saver control unit terminal 1
- through 10 A fuse [No.16, located in the fuse block (J/B)], and
- to headlamp battery saver control unit terminal 10,
- to auto light control unit terminal 1 and
- to smart entrance control unit terminal 33
- through 7.5 A fuse [No.11, located in the fuse block (J/B)].

When the ignition switch is in the ACC or ON position, power is supplied
- to auto light control unit terminal 2
- through 10 A fuse [No.9, located in the fuse block (J/B)]

Ground is supplied
- to headlamp battery saver control unit terminals 4 and 11
- through body grounds M77 and M111, and M4, M66 and M147
- to auto light control unit terminal 5
- through body grounds M4, M66 and M147.

Power Supply to Low Beam and High Beam
When lighting switch is in 2ND or PASS position, ground is supplied
- to headlamp relay (LH and RH) terminal 2 from headlamp battery saver control unit terminals 2 and 8
- through headlamp battery saver control unit terminals 3 and 9,
- 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 7 of each headlamp relay
- to terminal 3 of each headlamp

Ground is supplied
- to terminal 4 of each headlamp
- through body grounds E13 and E41.

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 5 of headlamp LH relay
- to terminal 1 of headlamp LH, and
- to combination meter terminal 26 for the HIGH BEAM indicator
- from terminal 5 of headlamp RH relay
- to terminal 1 of headlamp RH.

Ground is supplied
- to headlamp LH terminal 2
- to combination meter terminal 27 for the HIGH BEAM indicator
- through lighting switch terminals 6 and 5
- through body grounds E13 and E41, and
- to headlamp RH terminal 2
- through lighting switch terminals 9 and 8
- through body grounds E13 and E41.

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

BATTERY SAVER CONTROL
When the ignition switch is turned from ON (or START) to OFF (or ACC) positions while headlamps illuminate, the RAP signal is supplied to terminal 10 of the headlamp battery saver control unit from smart entrance control unit terminal 5.

After counting 45 seconds by the RAP signal from the smart entrance control unit to headlamp battery saver control unit, the ground supply to terminal 2 of the headlamp LH and RH relay from headlamp battery saver control unit terminals 2 and 8 is terminated.

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 headlamp battery saver control unit terminals 5 and 13 from lighting switch terminal 11, and
- to headlamp LH and RH relays terminal 2 from headlamp battery saver control unit terminals 2 and 8
- through headlamp battery saver control unit terminals 3 and 9, and
- through lighting switch terminal 12.

Then headlamps illuminate again.

AUTO LIGHT OPERATION
When lighting switch is in "AUTO" position, ground is supplied
- to auto light control unit terminal 10
- 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 battery saver control unit
- from auto light control unit terminal 6, and
- to tail lamp relay terminal 1
- through battery saver control unit
- from auto light control unit terminal 7.

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 is varies up to maximum of 20 seconds as the outside brightness changes.

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

THEFT WARNING SYSTEM
The theft warning system will flash the low beams if the system is triggered. Refer to "THEFT WARNING SYSTEM" .




XENON HEADLAMP
Xenon type headlamp is adopted to the low beam headlamps. Xenon bulbs do not use a filament. Instead, they produce light when a high voltage current is passed between two tungsten electrodes through a mixture of xenon (an inert gas) and certain other metal halides. In addition to added lighting power; electronic control of the power supply gives the headlamps stable quality and tone color.

Following are some of the many advantage of the xenon type headlamp.
- The light produced by the headlamps is white color approximating sunlight that is easy on the eyes.
- Light output is nearly double that of halogen headlamps, affording increased area of illumination.
- The light features a high relative spectral distribution at wavelengths to the human eye is most sensitive, which means that even in the rain, more light is reflected back from the road surface toward the vehicle, for added visibility.
- Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.