Instrument Panel, Gauges and Warning Indicators: Description and Operation

Gauges and Indicators

How the Circuit Works

The gauges and indicators are part of the multiplex integrated control system. Some indicators are controlled by conditions in their specific Systems. Information for these indicators is communicated from control unit to control unit across multiplex communication lines. The following indicators are communicated to the gauge control module through the multiplex integrated control system:
- ABS Indicator
- Charging System Indicator
- Cruise Control Indicators (LX, GX, EX, Si)
- Door Open Indicator
- DRL Indicator
- EPS Indicator (Si)
- High Beam Indicator
- Immobilizer System Indicator
- Lights On Indicator
- Low Oil Pressure Indicator
- MIL Indicator
- Seat Belt Reminder Indicator
- SRS Indicators
- Trunk Open Indicator
- VSA Activation Indicator
- VSA System Indicator
- Washer Fluid Level Indicator (Canada)

Refer to each individual system for more information.

Engine Coolant Temperature Gauge
The engine coolant temperature gauge is controlled by the power supply circuit/controller area network controller in the gauge control module (speedo). The power supply circuit/controller area network controller in the gauge control module (tach) receives engine coolant temperature information from the PCM through the fast controller area network (F-CAN) data lines. The power supply circuit/controller area network controller (tach) sends engine coolant temperature information through a dedicated data line to the power supply circuit/controller area network controller in the gauge control module (speedo), which controls the engine coolant temperature display.

Fuel Gauge and Low Fuel Indicator

WARNING: Do not smoke while working on the fuel system. Keep open flame away from the work area. Drain fuel only into an approved container.

The fuel gauge and low fuel indicator are controlled by the power supply circuit/controller area network controller in the gauge control module (speedo). When the resistance of the fuel gauge sending unit changes, the power supply circuit/controller area network controller in the gauge control module (tach) sends a signal through a dedicated data line to the power supply circuit/controller area network controller in the gauge control module (speedo) to display fuel level. When it is determined that the fuel level is low, the low fuel level indicator is activated.

Speedometer
The speedometer is controlled by the power supply circuit/controller area network controller in the gauge control module (speedo). The power supply circuit/controller area network controller in the gauge control module (tach) receives vehicle speed information from the PCM through the fast controller area network (F-CAN) data lines. The power supply circuit/controller area network controller (tach) sends vehicle speed information through a dedicated data line to the power supply circuit/controller area network controller in the gauge control module (speedo), which controls the speedometer display.

Tachometer
The tachometer is controlled by the power supply circuit/controller area network controller in the gauge control module (tach). The power supply circuit/controller area network controller in the gauge control module (tach) receives vehicle speed information from the PCM through the fast controller area network (F-CAN) data lines. The power supply circuit/controller area network controller controls the tachometer display.