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, the BCM (body control module) receives input signal requesting 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 CPU (central processing unit) in located in the IPDM E/R controls tail lamp relay coil. This relay, when energized, directs power to illumination lamps, which then illuminate.

OUT LINE

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,
- through 15 A fuse (No.78, located in IPDM E/R)
- to CPU located in IPDM E/R.

Power is also supplied at all times
- through 40 A fusible link (letter F, located in fuse, fusible link and relay box)
- to BCM terminal 55,
- through 10 A fuse [No.18, located in fuse block (J/B)]
- to BCM terminal 42,
- through 10 A fuse [No.19, located in fuse block (J/B)]
- to unified meter and A/C amp. terminal 21,
- through 10 A fuse [No.19, located in fuse block (J/B)]
- to combination meter terminal 24.

With ignition switch in the ON or START position, power is supplied
- to CPU located in IPDM E/R, from battery direct,
- through 10 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 NAVI control unit terminal 26 (With navigation system)
- through 10 A fuse [No.14, located in fuse block (J/B)]
- to combination meter terminal 23.

With ignition switch 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
- through grounds M30 and M66,
- to IPDM E/R terminals 38 and 60
- through grounds E17, E43 and F152,
- to unified meter and A/C amp. terminals 29 and 30
- through grounds M30 and M66,
- to combination meter terminals 10, 11 and 12
- through grounds M30 and M66,
- to NAVI control unit terminals 1 and 4 (With navigation system)
- through ground B102 (With navigation system).

ILLUMINATION OPERATION BY LIGHTING SWITCH
With the lighting switch in the 1ST or 2ND position, the BCM receives input signal requesting illumination lamps to illuminate. This input signal is communicated to the IPDM E/R across the CAN communication lines. CPU located in the IPDM E/R controls tail lamp relay coil, which,
when energized, directs power
- through terminal 22 of IPDM E/R
- to NAVI control unit terminal 25 (With navigation system)
- to NAVI switch terminal 2 (With navigation system)
- to VDC off switch (illumination) terminal 3 (With VDC)
- to TCS off switch (illumination) terminal 3 (With TCS)
- to A/T device A/T illumination terminal 3 (With A/T)
- to hazard switch (illumination) terminal 3
- to map lamp (illumination) terminal 4 (Roadster models)
- to ashtray illumination terminal 1 (With ashtray)
- to heated seat switch (driver side) (illumination) terminal 5 (With heated seat)
- to heated seat switch (passenger side) (illumination) terminal 5 (With heated seat)
- to luggage floor box lamp terminal 1
- to soft top switch (illumination) terminal 5 (Roadster model)
- to audio unit terminal 8.

Ground is supplied at all times
- to luggage floor box lamp terminal 2
- through grounds D105, B5, B6, and T14 (Coupe model)
- through grounds B5, B6 and T14 (Roadster model),
- to ashtray illumination terminal 2 (With ashtray)
- to map lamp (illumination) terminal 1 (Roadster models)
- through grounds M30 and M66,
- to soft top switch (illumination) terminal 6 (Roadster models)
- to hazard switch (illumination) terminal 4
- to VDC off switch (illumination) terminal 4 (With VDC)
- to TCS off switch (illumination) terminal 4 (With TCS)
- to A/T device (A/T illumination) terminal 5 (With A/T)
- to NAVI switch terminal 3 (With navigation system) l to audio unit terminal 7
- to heated seat switch (driver side) (illumination) terminal 6 (With heated seat), and
- to heated seat switch (passenger side) (illumination) terminal 6
- through combination meter terminal 18.

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, and the ignition switch is turned from ON or ACC to OFF, battery saver control function is activated.

Under this condition, the 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 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 "Information Bus".