Instrument Panel, Gauges and Warning Indicators: Description and Operation

Gauges and Indicators

How the Circuit Works

The gauges and indicators are part of the MICU system. Some indicators are controlled by conditions in their specific systems. Information for these indicators is communicated from control unit-to-control unit across the multiplex system. The following indicators are multiplex communicated to the gauge control module:

- ABS System Indicator
- charging System Indicator
- DRL Indicator
- High Beam Indicator
- Lights On Indicator
- Maintenance Required Indicator
- MIL Indicator
- Seat Belt Reminder Indicator
- Security Indicator
- Activation Indicator
- VSA Indicator

Refer to each individual system for more information. Also refer to the multiplex section of this ETM for more multiplex information.

Engine Coolant Temperature Gauge

The engine coolant temperature gauge is controlled by the power supply circuit/controller area network controller built-into the gauge control module. The power supply circuit/controller area network controller receives engine coolant temperature information from the ECM/PCM through the fast controller area network transceiver via the MICU system. The ECM/PCM receives engine coolant temperature information from the ECT sensor.

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 built-into the gauge control module. The power supply circuit/controller area network controller receives fuel level information from the fuel gauge sending unit. The resistance through the fuel gauge sending will change according to the level of the fuel within the fuel tank. This varying resistance enables the power supply circuit/controller area network controller to determine the level of the fuel. When it is determined that the fuel level is low, the low fuel indicator is illuminated. When the ignition switch is turned to LOCK (0), the gauge returns to the bottom of the gauge dial regardless of the fuel level.

Speedometer

The speedometer is controlled by the power supply circuit/controller area network controller built-into the gauge control module. The power supply circuit/controller area network controller receives vehicle speed information from the ECM/PCM through the fast controller area network transceiver via the MICU system. The ECM/PCM receives vehicle speed information from sensors within the manual or automatic transmission.

Tachometer

The tachometer is controlled by the power supply circuit/controller area network controller built-into the gauge control module. The power supply circuit/controller area network controller receives engine speed information from the ECM/PCM through the fast controller area network transceiver via the MICU. The ECM/PCM receives engine speed information from the CKP sensor.