Combination Meter

WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Combination Meter may also be referred to as an Instrument Panel.

An optitron display type combination meter has been adopted. See Fig 1. The optitron display type meter realizes excellent visibility through the use of smoke acylic in the protective panel, and LEDs (Light Emitting Diodes) that are very bright and have high contrast for illuminating the indicator and the dial. An odometer and trip meter that use an LCD (Liquid Crystal Display) has been adopted. The multi-information display has been provided below the speedometer.

The combination meter has a built-in meter ECU and buzzer for key reminder. See Fig 2. This meter ECU receives the engine coolant temperature signal and the engine speed signal by establishing communication with the ECM via a serial data link. Furthermore, the meter ECU receives various pieces of information that are necessary for it's operation from the sensors and switches. This meter ECU flashes it's warning lights even if an open circuit occurs in the wiring harness, which are connected to the ECUs for the purpose of flashing the ABS warning light, brake system warning light and the SRS air bag warning light.

The following pieces of information appear on the multi-information display: instant fuel consumption, average fuel consumption, drivable distance, average vehicle speed and elapsed time. The display functions can be switched by operating the steering wheel pad switch. See MULTI-INFORMATION DISPLAY table.

MULTI-INFORMATION DISPLAY

Item

Display Contents

Outline

Average Vehicle Speed

32.8 MPH

⁽¹⁾

Average Fuel Consumption

24.4 MPG

⁽²⁾

Instant Fuel Consumption

21.4 MPG

⁽³⁾

Elapsed Time

12:45

⁽⁴⁾

Drivable Distance

349 MI

⁽⁵⁾

⁽¹⁾	Displays the average vehicle speed, which is calculated by the ECU based on the length of time and the driven distance after connecting the battery terminal or pressing of the RESET switch of the steering wheel pad switch.

⁽²⁾

The calculation of the average fuel consumption rate for this display is updated every 10 seconds by the ECU, based on the following pieces of information: the driven distance (from the time the battery terminals have been connected, or the RESET switch on the steering wheel pad switch has been pressed and the fuel consumption volume (fuel injection signal from No. 1 injector).

⁽³⁾	In contrast to the calculations performed every 10 seconds for the average fuel consumption, the ECU calculates and displays the instant fuel consumption every 2 seconds.

⁽⁴⁾	Displays the length of time that has elapsed from the time the ignition switch has been turned ON after the battery terminals have been connected, or the RESET switch on the steering pad switch has been pressed.

⁽⁵⁾	Displays the approximate drivable distance that has been calculated based on the following pieces of information: the remaining fuel information from the meter ECU, vehicle speed signal, No. 1 injector's fuel injection signal and the fuel consumption that the ECU has learned.

Fig 1: Identifying Combination Meter

Fig 2: Identifying Combination Meter System Diagram