Sensing and Diagnostic Module

Sensing And Diagnostic Module:

The sensing and diagnostic module (SDM) sends a message to the cluster to control the following:

Speedometer And Tachometer
The input information for the speedometer and tachometer is supplied over the Class 2 serial data link by the powertrain control module (PCM) for the 4 cylinder engine, and by the Body control module (BCM) on the V-6 engine. The BCM gets the vehicle speed data from the engine control module (ECM) via the CAN serial data link.

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. The body control module (BCM) stores the vehicle mileage. If the BCM fails, the cluster will display the last valid mileage that was sent before the BCM failed. For replacement of the BCM refer to Body Control Module. If the instrument cluster fails, the mileage stored in the BCM will be sent to the new cluster via serial data.

Fuel Gauge
The input information for the fuel gauge is sent over the Class 2 serial data link by the body control module (BCM) on the V-6. Information is sent by the PCM on the 4 cylinder. The cluster will position the needle on the gauge based on the information sent by the BCM.