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

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INSTRUMENT CLUSTER - SERVICE INFORMATION

and audible tones. The Instrument Cluster indicator lamps are displayed by text overlays that show the lamps func-
tion. 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

INSTRUMENT CLUSTER - SERVICE INFORMATION

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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 cri-
teria, other factors, such as extreme speeds or cold
starts that are in combination with short distances, are
taken into account for adjusting the programmed ser-
vice 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

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INSTRUMENT CLUSTER - SERVICE INFORMATION

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