System Description
HEADLAMP (FOR USA)System Description
Control of the headlamp system operation is dependent upon the position of the combination switch (lighting switch). When the lighting switch is placed in the 2ND position, the BCM receives input requesting the headlamps (and tail lamps) illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the headlamp high and headlamp low relay coils. When energized, these relays direct power to the respective headlamps, which then illuminate.
OUTLINE
Power is supplied at all times
- to headlamp high relay, located in the IPDM E/R (intelligent power distribution module engine room), and
- to headlamp low relay, located in the IPDM E/R (intelligent power distribution module engine room), and
- to BCM (body control module) terminal 7
- through 50 A fusible link [letter f, located in the fuse and fusible link box].
With the ignition switch in the ON or START position, power is supplied
- to BCM (body control module) terminal 35
- through 10 A fuse [No. 12, located in the fuse block (J/B)].
With the ignition switch in the ACC or ON position, power is supplied
- to BCM (body control module) terminal 36
- through 10 A fuse [No. 6, located in the fuse block (J/B)].
Ground is supplied
- to BCM (body control module) terminals 8, 27, and 63
- through body grounds M57, M61, E15, and E24.
Low Beam Operation
With the lighting switch in 2ND position, the BCM (body control module) receives input requesting the headlamps to illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the headlamp low relay coil. When energized, this relay directs power
- to 15 A fuse [No. 50, located in the IPDM E/R]
- through terminal 27 of the IPDM E/R
- to terminal 1 of headlamp RH, and
- to 15 A fuse [No. 49, located in the IPDM E/R]
- through terminal 21 of the IPDM E/R
- to terminal 1 of headlamp LH.
Ground is supplied at all times
- to terminal 2 of headlamp RH
- through body grounds E15 and E24, and
- to terminal 2 of headlamp LH
- through body grounds E15 and E24.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM (body control module) receives input requesting the headlamp high beams to illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power
- to 10 A fuse [No. 47, located in the IPDM]
- through terminal 24 of the IPDM
- to terminal 1 of headlamp RH, and
- to 10 A fuse [No. 48, located in the IPDM]
- through terminal 22 of the IPDM
- to terminal 1 of headlamp LH.
Ground is supplied
- to terminal 2 of headlamp RH
- through body grounds E15 and E24, and
- to terminal 2 of headlamp LH
- through body grounds E15 and E24.
With power and ground supplied, the high beam headlamps and the HIGH BEAM indicator illuminate.
BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 2ND position (ON), and the ignition switch is turned from ON or ACC to OFF, the battery saver control feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, unless the combination switch (lighting switch) position is changed. If the combination switch (lighting switch) position is changed, then the headlamps are turned off.
AUTO LIGHT OPERATION
Refer to "System Description" for auto light operation.
Auto Light System
VEHICLE SECURITY SYSTEM
The vehicle security system will flash the high beams if the system is triggered. Refer to "VEHICLE SECURITY (THEFT WARNING) SYSTEM".
XENON HEADLAMP (IF EQUIPPED)
The low beam headlamps may be equipped with xenon type bulbs. 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 advantages of the xenon type headlamp.
- The light produced by the headlamps is a white color comparable to 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 which the human eye is most sensitive. This 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.