Tail 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 receives input requesting the parking, license plate, and tail lamps 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 tail lamp relay coil. This relay, when energized, directs power to the parking, license plate, and tail lamps, which then illuminate.

Power is supplied at all times
- to tail lamp relay, located in the IPDM E/R (intelligent power distribution module engine room)
- through 10 A fuse [No. 38, located in the IPDM E/R (intelligent power distribution module engine room)].

Power is also supplied at all times
- 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.

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 requesting the parking, license plate, and tail lamps 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 tail lamp relay coil, which when energized, directs power
- through terminal 37 of the IPDM E/R
- to front turn signal lamp LH terminal 1
- to front turn signal lamp RH terminal 1
- to rear combination lamp LH terminal 2,
- to rear combination lamp RH terminal 2,
- to license lamp LH terminal +, and
- to license lamp RH terminal +.

Ground is supplied at all times
- to front turn signal lamp LH terminal 2,
- through body grounds E15 and E24, and
- to front turn signal lamp RH terminal 2,
- through body grounds E115 and E129, and
- to rear combination lamp LH terminal 5
- through body grounds B7 and B19, and
- to rear combination lamp RH terminal 5
- through body grounds B7 and B19, and
- to license lamp LH terminal -,
- through body grounds B7 and B19, and
- to license lamp RH terminal -
- through body grounds B7 and B19.

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

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 plate, and tail lamps 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 parking, license plate, and tail lamps are turned off.

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.