For 1990-2009 cars

### Instrument Cluster

The instrument cluster receives information via the Class II serial data link from the body control module (BCM), the powertrain control module (PCM), and the sensing and diagnostic module (SDM). The information from the electronic brake/traction control module (EBTCM) is sent to the BCM via Key Word 2000, where it is converted into a Class II message and sent to the cluster.

### Body Control Module

Telltales | Gages
--- | ---
Brake | Odometer
Daytime Running Lamps (DRL) | Fuel Gage
High Beam | --
Low Brake Fluid | --
Low Fuel | --
Security | --
Service Wrench | --
Decklid/Liftgate Ajar | --
Seat Belt | --

### Powertrain Control Module

The powertrain control module (PCM) sends messages to the cluster to control the following:

Telltales | Gages
--- | ---
Service Engine Soon (MIL) | Speedometer
Speedometer | Tachometer
Tachometer | Coolant Gage
Change Oil Soon | --
Oil Pressure |
Coolant Temperature | --
Low Traction | --
Low Coolant | --
Service Wrench | --
Generator (Battery) | --
Upshift | --

### Sensing and Diagnostic Module

The sensing and diagnostic module (SDM) sends a message to the cluster to control the air bag telltales.

### Electronic Brake Traction Control Module (EBTCM)

The electronic brake traction control module (EBTCM) sends a message to the cluster to control the following telltales:

• | Brake

• | ABS

• | Service wrench

### Speedometer and Tachometer

The input information for the speedometer and tachometer is supplied over the Class II serial data link by the powertrain control module (PCM).

### Odometer

The odometer is an electronic digital display. There is one odometer display. The trip odometer and total odometer will show in this display area. The push button in the lower right side of the speedometer is used to toggle between the trip and total odometer readings. To reset the trip odometer, push and hold the button down for at least two seconds. The total odometer display has six digits with no decimal display. The trip odometer has four digits including a decimal point and indicates tenths of a mile or kilometer.

### Fuel Gauge

The input information for the fuel gage is sent over the Class II serial data link by the body control module (BCM). The cluster will position the needle on the gage based on the information sent by the BCM.