Headlamp (For Canada) - Daytime Light System
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEMSystem Description
The headlamp system for Canada vehicles is equipped with a daytime light control unit that activates the high beam headlamps at approximately half illumination whenever the engine is running. If the parking brake is applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking brake is applied.
Battery saver system is controlled by the BCM (body control module).
Power is supplied at all times
- to headlamp high relay located in the IPDM E/R (intelligent power distribution module engine room), and
- through 50 A fusible link (letter f , located in the fuse and fusible link box)
- to BCM terminal 70.
With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 12, located in the fuse block (J/B)]
- to daytime light control unit terminal 3, and
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM terminal 38.
With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in the fuse block (J/B)]
- to BCM terminal 11.
With the ignition switch in the START position, power is supplied
- through 10 A fuse [No. 9, located in the fuse block (J/B)]
- to daytime light control unit terminal 2.
Ground is supplied
- to daytime light control unit terminals 13, 14 and 16
- through grounds E15 and E24, and
- to BCM terminal 67
- through grounds F14, M57 and M61.
HEADLAMP OPERATION
Low Beam Operation
With the lighting switch in 2ND position, the BCM receives input requesting the headlamps to illuminate. This input is communicated to the IPDM E/R across the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp low relay coil. When energized, this relay directs power
- through 15 A fuse (No. 36, located in the IPDM E/R)
- through IPDM E/R terminal 20
- to RH headlamp terminal 1, and
- through 15 A fuse (No. 45, located in the IPDM E/R)
- through IPDM E/R terminal 30
- to LH headlamp terminal 1.
Ground is supplied
- to RH headlamp terminal 2
- to LH headlamp terminal 2
- through 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 receives input requesting the headlamp high beams to illuminate. This input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the combination meter controls the ON/OFF status of the HIGH BEAM indicator. The CPU of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power
- through 10 A fuse (No. 40, located in the IPDM E/R)
- through IPDM E/R terminal 27
- to daytime light control unit terminal 4
- through daytime light control unit terminal 7
- to RH headlamp terminal 1, and
- through 10 A fuse (No. 38, located in the IPDM E/R)
- through IPDM E/R terminal 28
- to daytime light control unit terminal 5
- through daytime light control unit terminal 6
- to LH headlamp terminal 1.
Ground is supplied
- to RH headlamp terminal 2
- to daytime light control unit terminal 9
- through daytime light control unit terminal 14
- through grounds E15 and E24, and
- to LH headlamp terminal 2
- to daytime light control unit terminal 10
- through daytime light control unit terminal 13
- through grounds E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
BATTERY SAVER CONTROL
With 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
For auto light operation, refer to "System Description" .
DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, power is supplied
- through daytime light control unit terminal 7
- to RH headlamp terminal 1
- through RH headlamp terminal 2
- to daytime light control unit terminal 9, and
- through daytime light control unit terminal 6
- to LH headlamp terminal 1
- through LH headlamp terminal 2
- to daytime light control unit terminal 10.
Ground is supplied
- to daytime light control unit terminals 13, 14 and 16
- through grounds E15 and E24.
Because the high beam headlamps are now wired in series, they operate at half illumination.
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.
OPERATION
After starting the engine with the lighting switch in the "OFF" or 1ST position, the headlamp high beam automatically turns on. Lighting switch operations other than the above are the same as conventional light systems.
CAN Communication System Description
Refer to LAN-20, Information Bus. Information Bus