Instrument Cluster / Carrier: Description and Operation

ILLUMINATION

System Description
Control of the illumination lamps operation is dependent upon the position of the lighting switch (combination switch). When the lighting switch is placed in the 1ST or 2ND position (or if the auto light system is activated) the BCM (body control module) receives input signal requesting the illumination 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 (intelligent power distribution module engine room) controls the tail lamp relay coil. This relay, when energized, directs power to the illumination lamps, which then illuminate.

Power is supplied at all times
- to ignition relay 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 10 A fuse [No. 71, 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 55
- through 50 A fusible link (letter F, located in the fuse and fusible link block)
- to BCM (body control module) terminal 42
- through 10 A fuse[No.18 located in fuse block (J/B)]
- to CPU (central processing unit) 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)].

With the ignition switch in the ON or START position, power is supplied
- to BCM (body control module) terminal 38
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to ignition relay in the IPDM E/R (intelligent power distribution module engine room)
- from ignition switch
- to combination meter terminals 41 and 42
- through 10 A fuse [No. 14 located in the fuse block (J/B)]
- to display and auto A/C amp. terminal 27
- to NAVI control unit terminal 27 (with NAVI)
- through 10 A fuse [No.12 located in fuse block (J/B)].

With the ignition switch in the ACC or ON position, power is supplied
- to BCM (body control module) terminal 11
- to combination meter terminal 40
- to NAVI control unit terminal 6 (with NAVI)
- to display unit terminal 19 (with NAVI)
- through 10 A fuse [No. 6, located in the fuse block (J/B)].

Ground is supplied
- to BCM (body control module) terminal 52
- to display and auto A/C amp. terminal 24
- to combination meter terminals 45, 46, and 47
- through grounds M30, and M66
- to IPDM E/R (intelligent power distribution module engine room) terminals 38 and 60
- through grounds E17, and E43.

ILLUMINATION 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 illumination 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, which, when energized, directs power
- through IPDM E/R terminal 22
- to glove box lamp terminal 1
- to upper glove box lamp terminal 1 (with NAVI)
- to A/T device (illumination) terminal 1
- to illumination control switch (illumination) terminal 1
- to VDC off switch (illumination) terminal 3 (with VDC)
- to clock (illumination) terminal 4
- to hazard switch (illumination) terminal 7
- to heated seat switch (driver side) (illumination) terminal 5 (with heater seat)
- to heated seat switch (passenger side) (illumination) terminal 5 (with heater seat)
- to A/C and audio controller (illumination) terminal 9
- to audio unit terminal 8
- to display and A/C auto amp. (illumination) terminal 28
- to front cigarette lighter socket terminal 3
- to ashtray (illumination) terminal 1
- to NAVI control unit (illumination) terminal 9
- to NAVI switch (illumination) terminal 2 (with NAVI).

Ground is supplied at all times
- to glove box lamp terminal 2
- to upper glove box lamp terminal 2 (with NAVI)
- to ashtray (illumination) terminal 2
- to illumination control switch terminal 3
- through grounds M30 and M66.

With power and ground supplied, illumination lamps illuminate.

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