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 high beam headlamps at approximately half illumination whenever engine is running. If parking brake is applied before engine is started daytime lights will not be illuminated. The daytime lights will illuminate once parking brake is released. Thereafter, daytime lights will continue to operate when parking brake is applied. And battery saver system is controlled by BCM (body control module).
OUTLINE
Power is supplied at all times
- to headlamp high relay, located in IPDM E/R (intelligent power distribution module engine room) and
- to headlamp low relay, located in IPDM E/R, from battery direct,
- through 15 A fuse (No. 78, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 10 A fuse (No. 71, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 15 A fuse (No. 88, located in IPDM E/R)
- to front fog lamp relay, located in IPDM E/R,
- through 10 A fuse [No. 19, located in fuse block (J/B)]
- to combination meter terminal 21,
- through 10 A fuse [No. 21, located in fuse block (J/B)]
- to daytime light control unit terminals 2 and 3,
- through 50 A fusible link (letter F, located in fuse, fusible link and relay box)
- to BCM terminal 55,
- through 10 A fuse [No. 18, located in fuse block (J/B)]
- to BCM terminal 42.
With the ignition switch in the ON or START position, power is supplied
- to CPU located in IPDM E/R, from battery direct,
- through 10 A fuse (No. 82, located in IPDM E/R)
- to daytime light control unit terminal 12,
- through 10 A fuse [No. 1, located in fuse block (J/B)]
- to BCM terminal 38,
- through 10 A fuse [No. 14, located in fuse block (J/B)]
- to combination meter terminals 22 and 23.
With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in 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 fuse block (J/B)]
- to daytime light control unit terminal 1.
Ground is supplied
- to daytime light control unit terminal 9
- through grounds E17 and E43,
- to BCM terminal 52
- through grounds M30 and M66,
- to IPDM E/R terminals 38 and 60
- through grounds E17 and E43,
- to combination meter terminals 1, 24 and 25
- through grounds M30 and M66.
HEADLAMP OPERATION
Low Beam Operation
With the lighting switch in 2ND position, the BCM receives input signal requesting the headlamps to illuminate.
This input signal is communicated to IPDM E/R through CAN communication lines. The CPU located in the IPDM E/R controls the headlamp low relay coil, which when energized, directs power
- through 15 A fuse (No. 76, located in IPDM E/R)
- through IPDM E/R terminal 20
- to front combination lamp RH terminal 3,
- through 15 A fuse (No. 86, located in IPDM E/R)
- through IPDM E/R terminal 30
- to front combination lamp LH terminal 3.
Ground is supplied
- to front combination lamp RH terminal 4
- through grounds E17 and E43,
- to front combination lamp LH terminal 4
- through grounds E17 and E43.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation (When Daytime Light Does Not Operate)/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH BEAM or PASSING position, the BCM receives input signal requesting headlamp high beams to illuminate. High beam request signal is communicated to the IPDM E/R through CAN communication lines. The CPU located in the IPDM E/R controls headlamp high relay coil and daytime light relay-2 turned ON, which when energized, directs power
- through 10 A fuse (No. 74, located in IPDM E/R)
- through IPDM E/R terminal 28
- to daytime light control unit terminal 5
- through daytime light control unit terminal 6
- to front combination lamp LH terminal 2,
- through 10 A fuse (No. 72, located in IPDM E/R)
- through IPDM E/R terminal 27
- to daytime light relay-2 terminal 2 and 5, and
- to daytime light control unit terminal 1,
- through daytime light relay-2 terminal 3
- to front combination lamp RH terminal 2,
- through 15 A fuse (No. 76, located in IPDM E/R)
- through IPDM E/R terminal 20
- to front combination lamp RH terminal 3, and
- to daytime light control unit terminal 1,
- through 15 A fuse (No. 86, located in IPDM E/R)
- through IPDM E/R terminal 30
- to front combination lamp LH terminal 3, and
- to daytime light control unit terminal 4.
Ground is supplied
- to daytime light relay-2 terminal 1
- through grounds E17 and E43,
- to front combination lamp RH terminal 8
- through grounds E17 and E43,
- to front combination lamp RH terminal 4
- through grounds E17 and E43,
- to front combination lamp LH terminal 4
- through grounds E17 and E43,
- to front combination lamp LH terminal 8
- through daytime light control unit terminal 7
- through daytime light control unit terminal 9
- through grounds E17 and E43.
With the power and ground supplied, the headlamp high beam and low headlamp illuminate.
High beam indicator illuminates when combination meter receives input signal requesting high beam indicator to illuminate. This is communicated to BCM through CAN communication lines.
DAYTIME LIGHT OPERATION
With engine running, lighting switch in OFF or 1ST position and parking brake released, power is supplied
- through daytime light control unit terminal 6
- to front combination lamp LH terminal 2
- through front combination lamp LH terminal 8
- to daytime light control unit terminal 7
- through daytime light control unit terminal 8
- to front combination lamp RH terminal 2.
Ground is supplied
- to front combination lamp RH terminal 8
- through grounds E17 and E43.
Because high beam headlamps are now wired in series, they operate at half illumination.
If lighting switch is in 2ND or PASSING position, daytime light operation is canceled. On this occasion, power is supplied
- through IPDM E/R terminal 20 (with lighting switch in 2ND position)
- through IPDM E/R terminal 27 (with lighting switch in PASSING position)
- to daytime light control unit terminal 1.
Daytime light control unit is canceled power supplying from front combination lamp RH terminal 8 to terminal 2 (series power supplying is canceled). And then high beam is ON.
OPERATION
After starting engine with lighting switch in the OFF or 1ST position, headlamp high beam automatically turns on. Lighting switch operations other than above are same as conventional light systems.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "COMBINATION SWITCH READING FUNCTION". Description and Operation
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 2ND position and the ignition switch is turned from ON or ACC to OFF, the battery saver control function is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, then the headlamps are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
AUTO LIGHT OPERATION (IF EQUIPPED)
For auto light operation, refer to "System Description" in "AUTO LIGHT SYSTEM".
VEHICLE SECURITY SYSTEM
The vehicle security system will flash the high beams if the system is triggered.
XENON HEADLAMP
Xenon type lamps are used for 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 strong lighting power, electronic control of the power supply gives the headlamps stable quality and tone color.
Followings are some advantages of the xenon type headlamp.
- The light produced by the headlamps is white color similar to sunlight that is easy to the eyes.
- Light output is nearly double that of halogen headlamps, affording increased area of illumination.
- Counter-reflected luminance increases and the contrast enhances on the wet road in the rain. That makes visibility go up more than the increase of the light volume.
- Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.
CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Unit
Refer to LAN-27, Information Bus. Description and Operation