Description and Operation - RHD
INSTRUMENT CLUSTER - SERVICE INFORMATIONDESCRIPTION - RHD
The Instrument Cluster is used to inform the driver about important vehicle operating conditions and to warn the driver about potentially critical operating conditions. For this, the Instrument Cluster has indicator lamps, display gauges and audible tones. The Instrument Cluster indicator lamps are displayed by text overlays that show the lamp's function. The information required for the indicator lamps and audible tones is transmitted from their sensors to the Instrument Cluster via direct lines or from their control modules to the Instrument Cluster via the Controller Area Network (CAN) data bus.
The Instrument Cluster is equipped with a microprocessor designed to analyze the incoming data for the indicator lamps and audible tones. The program and the data required are stored in an electronic memory chip called the Erasable Electronic Programmable Read Only Memory (EEPROM).
The indicator lamps are listed below according to their type and actuation method (hard wired or CAN Bus).
HARD WIRE ACTUATED INDICATOR LAMPS
- Left turn signal indicator lamp
- Right turn signal indicator lamp
- High beam indicator lamp
- Low fuel level indicator lamp
- Low washer fluid indicator lamp
- Low coolant level indicator lamp
- Battery voltage indicator lamp
- Seat belt indicator lamp
- Lamp outage indicator lamp
- Malfunction indicator lamp (MIL)
- Brake Assist System (BAS) MIL
- Electronic Stability Program (ESP) warning lamp
- Supplemental Restraint System (SRS) MIL
CAN BUS ACTUATED INDICATOR LAMPS
- Brake warning indicator lamp
- Brake wear indicator lamp
- Antilock Brake System (ABS) warning indicator lamp
HARD WIRE ACTUATED AUDIBLE TONES AND INDICATOR LAMPS
- Turn signal ticker (audible tone / indicator lamp)
- Seat belt reminder (audible tone / indicator lamp)
- Switched - on headlamps reminder (audible tone)
- Key warning (audible tone)
CAN BUS ACTUATED AUDIBLE TONES
- Parking brake warning
FLEXIBLE SERVICE SYSTEM (FSS) INDICATOR
The Flexible Service System (FSS) indicator (2) draws the attention of the driver to a particular service that is due. The FSS indicator (2) is a mileage/time-activated engine service system for recommended oil change intervals. In addition to time (in days) and distance criteria, other factors, such as extreme speeds or cold starts that are in combination with short distances, are taken into account for adjusting the programmed service intervals. If the oil level drops below a warning threshold, the remaining distance (1) or the remaining time (1) and the tool symbol (2) are displayed. The FSS indicator (2) has its own microprocessor in the Instrument Cluster. The FSS indicator (2) obtains time information from the digital clock integrated into the Instrument Cluster. The other data required is obtained via the CAN data bus from the Controller Antilock Brake (CAB) and the Powertrain Control Module (PCM).
The following are CAN Bus data inputs required for FSS indicator operation:
- 4 Wheel Speed Sensors (WSS) signals for calculating vehicle speed and distance from the CAB
- Coolant temperature from the PCM
- Engine speed from the PCM
- Load torque from the PCM
OPERATION - RHD
INSTRUMENT CLUSTER GAUGES
The Instrument Cluster includes four analog gauges.
1. Speedometer The speedometer has a 0-160 Miles Per Hour (MPH) primary scale with Kilometers Per Hour (km/h) on the secondary scale. The speedometer receives wheel speed data from the CAB via the CAN data bus and can be verified by comparing the speed signal viewed by the DRB III(R) from the wheel speed sensors (WSS) and the output seen on the Instrument Cluster. The Electronic Stability Program (ESP) indicator lamp located between the left and right turn signals in the speedometer face illuminates when it is activated by the Controller Antilock Brake (CAB), indicating the need to adjust driving behavior to the prevailing road conditions. Also located in the speedometers face are the trip odometer and the Flexible Service System (FSS) indicator/odometer (1). To the right and left of the speedometer face, mounted in the Instrument Cluster, are the complete dials (2-3) for the FSS and the digital clock.
2. Tachometer The 7000 RPM tachometer is redlined at 6200 RPM. The tachometer also contains the digital clock and the transmission range indicator.
3. Fuel level and Coolant temperature
The fuel level gauge is displayed in increments of one-quarter marks displaying F (Full), 1/2 (one half tank) and E (Empty). The temperature gauge is displayed as H (Hot) and C (Cold).
The outside ambient air temperature digital display is located in the lower center portion of the coolant temperature / fuel gauge and is calibrated in degrees Centigrade (° C).