Combination Meters
Combination Meters Schematic
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.
- Odo/trip meter, A/T indicator and ICC system display segments can be checked in self-diagnosis mode.
- Meters/gauges can be checked in self-diagnosis mode.
POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times
- through 10 A fuse [No. 19, located in the fuse block (J/B)]
- to combination meter terminal 8, and
- to unified meter and A/C amp. terminal 21.
With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminal 7,
- through 10 A fuse [No. 12, located in the fuse block (J/B)]
- to unified meter and A/C amp. terminal 22.
With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in the fuse block (J/B)]
- to combination meter terminal 4,
- through 15 A fuse [No. 10, located in the fuse block (J/B)], and
- through 15 A fuse [No. 11, located in the fuse block (J/B)]
- to unified meter and A/C amp. terminal 46.
Ground is supplied
- to combination meter terminals 5, 6 and 15
- through grounds M35, M45 and M85,
- to unified meter and A/C amp. terminals 29 and 30
- through grounds M35, M45 and M85.
SPEEDOMETER
The speedometer indicates the vehicle speed.
- ABS actuator and electric unit (control unit) provides a vehicle speed signal to the unified meter and A/C amp. with CAN communication.
- Unified meter and A/C amp. converts the vehicle speed signal to the 8-pulse signal, and outputs the vehicle speed signal (8-pulse) to combination meter.
- Combination meter indicates the vehicle speed according to vehicle speed signal (8-pulse) signal.
TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm).
- ECM provides engine speed signal to unified meter and A/C amp. with CAN communication.
- Unified meter and A/C amp. transmits engine speed signal to combination meter with communication line.
- Combination meter indicates the engine speed according to engine speed signal.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
- ECM provides engine coolant temperature signal to unified meter and A/C amp. with CAN communication.
- Unified meter and A/C amp. transmits engine coolant temperature signal to combination meter with communication line.
- Combination meter indicates the engine coolant temperature according to engine coolant temperature signal.
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
- Unified meter and A/C amp. reads a resistor signal from fuel level sensor.
Signal is supplied
- from unified meter and A/C amp. terminal 36
- 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 28 for the fuel gauge.
- Unified meter and A/C amp. provides a fuel level signal to combination meter with communication line.
- Combination meter indicates the approximate fuel level according to the fuel level signal.
ODO/TRIP METER
- ABS actuator and electric unit (control unit) provides a vehicle speed signal to the unified meter and A/C amp. with CAN communication.
- Unified meter and A/C amp. converts the vehicle speed signal to the 8-pulse signal, and outputs the vehicle speed signal (8-pulse) to combination meter.
- Combination meter uses the vehicle speed signal (8-pulse) to calculate the mileage, and displays it.
How to Change The Display For Odo/trip Meter
Switch modes with following procedure.
- When trip transfer switch is pressed, trip meter display changes.
- If trip reset switch is pressed for 1 second or more while "trip A" is displayed, only "trip A" is reset.
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.
COMBINATION METER ILLUMINATION CONTROL
Daytime Mode
When ignition switch is turned ON, combination meter illumination is turned ON by unified meter control unit.
Nighttime Mode
- Unified meter control unit is transferred to nighttime mode, with ignition switch turned ON and position light request signal from BCM with CAN communication.
- When nighttime mode, illumination control switch illumination turns ON by unified meter control unit. Each illumination is controlled by unified meter control unit.
- Each illumination can be adjusted to 16 step by illumination control switch in nighttime mode.
FAIL-SAFE
