License Plate Lamp: Description and Operation

System Description
Control of the parking, license plate, and tail lamp operation is dependent upon the position of the lighting switch (combination switch). When the lighting switch is placed in the 1ST position, the BCM (body control module) receives input signal requesting the parking, license plate, side marker and tail lamps to illuminate. This input signal 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 tail lamp relay coil. This relay, when energized, directs power to the parking, license plate, side marker and tail lamps, which then illuminate.

The current that flows by Rear combination lamp unit is controlled, and a tail lamp (LED) is made to turn on. Power is supplied at all times
- through 10 A fuse [No. 71, located in the IPDM E/R (intelligent power distribution module engine room)]
- to tail lamp relay, located in the IPDM E/R (intelligent power distribution module engine room)
- through 15 A fuse [No. 78 located in the IPDM E/R (intelligent power distribution module engine room)]
- to CPU (central processing unit) in the IPDM E/R (intelligent power distribution module engine room).

Power is also supplied at all times
- through 50 A fusible link (letter M, located in the fuse and fusible link box)
- to BCM (body control module) terminal 55
- through 15 A fuse [No. 22, located in the fuse block (J/B)]
- to BCM (body control module) terminal 42
- through 10 A fuse [No. 20, located in the fuse block (J/B)]
- to rear combination lamp control unit terminal 1.

With the ignition switch in the ON or START position, power is supplied
- through 15 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM (body control module) terminal 38
- through ignition relay, located in the IPDM E/R (intelligent power distribution module engine room)
- to CPU (central processing unit) in the IPDM E/R (intelligent power distribution module engine room)

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 (body control module) terminal 11.

Ground is supplied
- to BCM (body control module) terminal 49 and 52
- through grounds M35, M45 and M85
- to IPDM E/R (intelligent power distribution module engine room) terminals 38 and 60
- through grounds E21, E50 and E51
- to rear combination lamp control unit terminal 7
- through grounds E21, E50 and E51.

OPERATION BY LIGHTING SWITCH
With the lighting switch in the 1ST or 2ND position (or if the auto light system is activated), the BCM (body control module) receives input signal requesting the parking, license plate, side marker and tail lamps to 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) in the IPDM E/R controls the tail lamp relay coil, which when energized, directs power
- through IPDM E/R terminal 22
- to front side marker lamp LH terminal 1
- to clearance lamp LH terminal 2
- to license plate lamp LH terminal 1
- to rear combination lamp LH terminal 1
- to rear combination lamp control unit terminal 2
- to front side marker lamp RH terminal 1
- to clearance lamp RH terminal 2
- to license plate lamp RH terminal 1
- to rear combination lamp RH terminal 1.

Ground is supplied at all times
- to front side marker lamp LH terminal 2
- through grounds E21, E50 and E51
- to clearance lamp LH terminal 3
- through grounds E21, E50 and E51
- to license plate lamp LH terminal 2
- through grounds B15 and B45
- to rear combination lamp LH terminal 2
- through grounds B15 and B45
- to front side marker lamp RH terminal 2
- through grounds E21, E50 and E51
- to clearance lamp RH terminal 3
- through grounds E21, E50 and E51
- to license plate lamp RH terminal 2
- through grounds B15 and B45
- to rear combination lamp RH terminal 2
- through grounds B203 and B210
- to rear combination lamp control unit terminal 7
- through grounds E21, E50 and E51.

With power and ground supplied, the parking, license plate, side marker and tail lamps illuminate.

COMBINATION SWITCH READING FUNCTION
Refer to "COMBINATION SWITCH READING FUNCTION". Body Control Module

EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 1ST (or 2ND) position, and the ignition switch is turned from ON or ACC to OFF, the battery saver control feature is activated.

Under this condition, the parking, license, side marker and tail lamps remain illuminated for 5 minutes, then the parking, license plate, side marker and tail lamps are turned off.

Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.

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.

CAN Communication Unit
Refer to "Information Bus".