Headlamp (For USA) - Conventional Type

HEADLAMP (FOR USA) - CONVENTIONAL TYPE - Schematic






HEADLAMP (FOR USA) - CONVENTIONAL TYPE -

System Description
The 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 (body control module) receives input signal requesting the headlamps (and tail lamps) illuminate. This input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) located in the IPDM E/R controls the headlamp high and headlamp low relay coils. These relays, when energized, direct power to the respective headlamps, which then illuminate.

OUTLINE
Power is supplied at all times
- to headlamp high relay, located in IPDM E/R and
- to headlamp low relay, located in IPDM E/R, from battery direct,
- through 15 A fuse (No. 71, located in IPDM E/R)
- to CPU, located in IPDM E/R,
- through 15 A fuse (No. 78, located in IPDM E/R)
- to CPU, located in IPDM E/R,
- through 50 A fusible link (letter F, located in fuse and fusible link block)
- to BCM terminal 55,
- through 10 A fuse [No. 21, located in fuse block (J/B)]
- to BCM terminal 42 and
- to combination meter terminal 23,
- through 10 A fuse [No. 19, located in fuse block (J/B)]
- to unified meter and A/C amp. terminal 54,
- through 10 A fuse [No. 22, located in fuse block (J/B)]
- to key slot terminal 1.

When the ignition switch is in the ON or START position, power is supplied
- to CPU, located in IPDM E/R,
- through 15 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 terminal 12,
- through 10 A fuse [No. 12, located in fuse block (J/B)]
- to unified meter and A/C amp. terminal 53.

When the ignition switch is 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.

Ground is supplied
- to BCM terminal 52
- to combination meter terminals 9, 10, and 11
- to unified meter and A/C amp. terminals 55 and 71
- to push-button ignition switch (push switch) terminal 1
- to key slot terminal 8
- through grounds M16 and M70,
- to IPDM E/R terminals 38 and 51
- through grounds E22 and E43.

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 the IPDM E/R across the 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 8,
- through 15 A fuse (No. 86, located in IPDM E/R)
- through IPDM E/R terminal 30
- to front combination lamp LH terminal 8.

Ground is supplied
- to front combination lamp RH terminal 4
- to front combination lamp LH terminal 4
- through grounds E22 and E43.

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 signal requesting the headlamp high beams and low beams to illuminate. This input signal is communicated to the IPDM E/R across the CAN communication lines. The CPU located in the IPDM E/R controls the headlamp high relay coil and 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 8,
- through 15 A fuse (No. 86, located in IPDM E/R)
- through IPDM E/R terminal 30
- to front combination lamp LH terminal 8,
- through 10 A fuse (No. 72, located in IPDM E/R)
- through IPDM E/R terminal 27
- to front combination lamp RH terminal 6,
- through 10 A fuse (No. 74, located in IPDM E/R)
- through IPDM E/R terminal 28
- to front combination lamp LH terminal 6.

Ground is supplied
- to front combination lamp RH terminal 4
- to front combination lamp LH terminal 4
- to front combination lamp RH terminal 2
- to front combination lamp LH terminal 2
- through grounds E22 and E43.

With power and ground supplied, the high beam and low beam headlamps illuminate.
The unified meter and A/C amp. that received the high beam request signal by BCM across the CAN communication makes a high beam indicator lamp turn on in the combination meter.

EXTERIOR LAMP 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 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-III.

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 a 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.