System Description

COMBINATION METERS


System Description


UNIFIED METER CONTROL UNIT
- Speedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled by the unified meter control unit, which is built into the combination meter. Unified meter control unit receives signals from unified meter and A/C amp.
- Warning lamp and indicator lamp of combination meter are controlled by signals drawn from the unified meter and A/C amp.
- Digital meter is adopted for odo/trip meter.

NOTE:
The record of the odo meter is kept even if the battery cable is disconnected. The record of the trip meter is erased when the battery cable is disconnected.
- Dot matrix LCD is adopted to display "push engine starter", "A/T position" and "ICC system*".
- Odo/trip meter and dot matrix LCD segments can be checked in self-diagnosis mode.
- Meters/gauges can be checked in self-diagnosis mode.





: With ICC system

UNIFIED METER AND A/C AMP.
Refer to System Description in "UNIFIED METER AND A/C AMP".

POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times
- through 10A fuse [No. 21, located in the fuse block (J/B)]
- to combination meter terminal 23, � through 10A fuse [No. 19, located in the fuse block (J/B)]
- to unified meter and A/C amp. terminal 54.
With the ignition switch in the ACC or ON position, power is supplied
- through 10A fuse [No. 6, located in the fuse block (J/B)], � to combination meter terminal 2, and
- to unified meter and A/C amp. terminal 41.
With the ignition switch in the ON or START position, power is supplied
- through 10A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminal 12, � through 10A fuse [No. 12, located in the fuse block (J/B)]
- to unified meter and A/C amp. terminal 53.
Ground is supplied
- to combination meter terminals 9, 10 and 11
- to unified meter and A/C amp. terminals 55 and 71
- through grounds M16 and M70.

SPEEDOMETER
The speedometer indicates the vehicle speed.
- The ABS actuator and electric unit (control unit) converts the pulse signal provided by the wheel sensor to a vehicle speed signal and transmits it to the unified meter and A/C amp. with CAN communication line.
- The unified meter and A/C amp. receives the vehicle speed signal from the ABS actuator and electric unit
(control unit) with CAN communication line and transmits it to the combination meter by means of communication line.
- The combination meter indicates the vehicle speed according to the vehicle speed signal received from the unified meter and A/C amp. by means of communication line.

TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm).
- The ECM converses the pulse signal provided by the crankshaft position sensor to an engine speed signal and transmits it to unified meter and A/C amp. with CAN communication.
- The unified meter and A/C amp. transmits engine speed signal to combination meter with communication line.
- The unified meter and A/C amp. receives the engine speed signal from the ECM with CAN communication line and transmits it to the combination meter by means of communication line.
- Combination meter converses engine speed signal to the angle signal, and commands to tachometer.





WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
- The ECM converses a signal from engine coolant temperature sensor to engine coolant temperature signal, and transmits to unified meter and A/C amp. with CAN communication.
- The unified meter and A/C amp. transmits engine coolant temperature signal to the combination meter with communication line.
- The combination meter converses engine coolant temperature signal to the angle signal, and commands to water temperature gauge.





FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied
- from unified meter and A/C amp. terminal 58
- through the fuel level sensor unit and fuel pump (main) terminals 5 and 2, and
- through the fuel level sensor unit (sub) terminals 2 and 1
- to unified meter and A/C amp. terminal 42.
Unified meter and A/C amp. provides a fuel level signal to combination meter for fuel gauge with communication line between unified meter and A/C amp. and combination meter.

ODO/TRIP METER
- ABS actuator and electric unit (control unit) converses a pulse signal from wheel sensor to vehicle speed signal, and transmits vehicle speed signal to unified meter and A/C amp. with CAN communication.
- Unified meter and A/C amp. converses vehicle speed signal to 8 pulse signal, and transmits to combination meter.
- Combination meter processes the 8 pulse signal and the memory signals from the meter memory circuit.
Then the mileage is displayed.

How to Change The Display For Odo/trip Meter
Operating the odo/trip meter switch allows switching the mode in the following order.









- The odo/trip meter display switching and trip display resetting can be identified by the time from pressing the odo/trip meter switch (1) to releasing it.
- When resetting with "trip A" displayed, only "trip A" display is reset.
(The same way for "trip B".)

METER ILLUMINATION CONTROL
- Meter illumination* is controlled by the unified meter control unit.
- Ring illumination under normal operation and engine start excitement function can be turned ON/OFF with pressing meter illumination control switch for more than 1 second.
*: Illumination for ring, meter face, pointer, dot matrix LCD and odo/trip meter

Daytime Mode
Meter illumination is adjusted to 5 steps by meter illumination control switch (1) in daytime mode.






Nighttime Mode
- Combination meter is transferred to nighttime mode with position light request signal from BCM with CAN communication.
- Meter illumination is adjusted to 16 steps by illumination control switch (1) in nighttime. Refer to System Description.






Driver Welcome Function
Ring illumination gradually turns ON when a driver gets in the vehicle with Intelligent Key and closes the driver side door.

NOTE:
Ring illumination gradually turns OFF when not turning the ignition switch ON at a certain period of time.

Engine Start Excitement Function
Combination meter detects the engine start when input engine speed signal at first. Pointers of speed meter and tachometer sweep and ring illumination gradually turns ON when combination meter detects the engine start. Then, combination meter starts the normal control.

NOTE:
- Water temperature gauge and fuel gauge do not function.
- Engine start excitement function can be turned ON/OFF with pressing meter illumination control switch for more than 1 second.

FAIL-SAFE
Combination meter performs fail-safe operation when unified meter and A/C amp. communication is malfunction.
Solution for communication error between the unified meter and A/C amp. and combination meter