Description

LHD





The Instrument Cluster is used to inform the driver of important vehicle operating conditions, and to warn the driver of potentially critical operating conditions. For this, the Instrument Cluster utilizes indicator lamps, display gauges and audible tones. The Instrument Cluster indicator lamps are displayed by text overlays that show the lamps function. The inputs to the Instrument Cluster are transmitted via hard wired sensors, or through 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

- Low tire pressure indicator lamp
- 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 (audible tone & indicator lamp)
- Seat belt reminder (audible tone & indicator lamp)
- Headlamps on reminder (audible tone)
- Key in ignition warning (audible tone)

CAN BUS ACTUATED AUDIBLE TONES

- Parking brake warning

CAN BUS FUNCTIONAL DIAGRAM





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:

- CAB supplied input: 4 wheel speed signals for calculating vehicle speed
- CAB supplied input: 4 wheel speed signals for calculating distance traveled
- PCM supplied input: Engine coolant temperature
- PCM supplied input: Engine speed
- PCM supplied input: Engine load