Instrument Cluster / Carrier: Description and Operation

ILLUMINATION

System Description
Control of illumination lamps operation is dependent upon position of lighting switch (combination switch). When lighting switch is placed in the 1ST or 2ND position (or if auto light system is activated), BCM (body control module) receives input signal requesting illumination lamps to illuminate. This input signal is communicated to IPDM E/R (intelligent power distribution module engine room) through the CAN communication lines.
The CPU (central processing unit) located in the IPDM E/R controls tail lamp relay coil. This relay, when energized, directs power to illumination lamps, which then illuminate.

Power is supplied at all times
- through 10 A fuse (No. 71, located in IPDM E/R)
- to tail lamp relay, located in IPDM E/R, and
- to CPU located in IPDM E/R.

Power is also supplied at all times
- through 50 A fusible link (letter M, located in fuse, fusible link and relay box)
- to BCM terminal 55,
- through 15 A fuse [No. 22 located in fuse block (J/B)]
- to BCM terminal 42,
- through 15 A fuse (No. 78, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 10 A fuse [No. 19 located in fuse block (J/B)]
- to unified meter and A/C amp. terminal 21, and
- to combination meter terminal 8.

With ignition switch in ON or START position, power is supplied
- to ignition relay, located in IPDM E/R, from battery direct,
- through 15 A fuse [No. 1 located in fuse block (J/B)]
- to BCM terminal 38,
- through 10 A fuse [No. 12, located in fuse block (J/B)]
- to unified meter and A/C amp. terminal 22,
- to combination meter terminal 7.

With ignition switch in ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in fuse block (J/B)]
- to combination meter terminal 4 and
- to BCM terminal 11.

Ground is supplied
- to BCM terminals 49 and 52
- to unified meter and A/C amp. terminals 29 and 30, and
- to combination meter terminals 5, 6, and 15
- through grounds M35, M45, and M85,
- to IPDM E/R terminals 38 and 60
- through grounds E21, E50, and E51.

ILLUMINATION OPERATION BY LIGHTING SWITCH
With lighting switch in the 1ST or 2ND position (or if auto light system is activated), BCM receives input signal requesting illumination lamps to illuminate. This input signal is communicated to IPDM E/R through the CAN communication lines. The CPU located in the IPDM E/R controls tail lamp relay coil, which, when energized, directs power
- through IPDM E/R terminal 22
- to glove box lamp terminal 1
- to A/T device (illumination) terminal 11
- to snow mode switch (illumination) terminal 5
- to VDC off switch (illumination) terminal 3
- to clock (illumination) terminal 3
- to hazard switch (illumination) terminal 3
- to heated seat switch (driver side) (illumination) terminal 5
- to heated seat switch (passenger side) (illumination) terminal 5
- to door mirror remote control switch (illumination) terminal 16
- to LDW switch (illumination) terminal 5
- to combination switch (spiral cable) terminal 26
- to microphone terminal 2 (with telephone system)
- to A/C and AV switch (illumination) terminal 3
- to DVD player (illumination) terminal 12
- to coin box illumination terminal 2
- to rear power window switch LH and RH (illumination) terminals 6,
- through combination switch (spiral cable) terminal 18
- to audio steering switch (illumination), and
- to icc steering switch (illumination) (with icc)
- to ascd steering switch (illumination) (without icc)

Illumination control
- through combination meter terminal 19
- to A/T device (illumination) terminal 12
- to snow mode switch (illumination) terminal 6
- to VDC off switch (illumination) terminal 4
- to clock (illumination) terminal 4
- to hazard switch (illumination) terminal 4
- to heated seat switch (driver side) (illumination) terminal 6
- to heated seat switch (passenger side) (illumination) terminal 6
- to door mirror remote control switch terminal 15
- to LDW switch (illumination) terminal 4,
- to combination switch (spiral cable) terminal 27
- to A/C and AV switch (illumination) terminal 4
- to DVD player (illumination) terminal 10,
- through combination switch (spiral cable) terminal 21
- to audio steering switch (illumination), and
- to icc steering switch (illumination) (with icc)
- to ascd steering switch (illumination) (without icc)

Ground is supplied at all times
- to glove box lamp terminal 2, and
- to coin box illumination terminal 3
- through grounds M35, M45 and M85,
- to rear power window switch LH and RH (illumination) terminals 7
- through grounds B15 and B45.

With power and ground supplied, illumination lamps illuminate.

EXTERIOR LAMP BATTERY SAVER CONTROL
When the lighting switch is in the 1ST or 2ND position (or if auto light system is activated), and ignition switch is turned from ON or ACC to OFF, battery saver control function is activated. Under this condition, illumination lamps remain illuminated for 5 minutes, then illumination lamps are turned off.

When the lighting switch is turned from OFF to 1ST or 2ND position (or if auto light system is activated) after illumination lamps are turned off by battery saver control, and illumination lamps illuminate again.
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 LAN-32, "CAN Communication Unit". Description and Operation