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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1538 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) displays the vehicle speed based on the information from the engine control module (ECM)/powertrain control module (PCM). The ECM/PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The ECM/PCM sends the vehicle speed information via CAN serial data circuit to the body control module (BCM). The BCM then sends the information via class 2 serial data to the IPC to order to display the vehicle speed and miles traveled.

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