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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1490 (Rear Wheel Steering System) >> Diagnostic Information and Procedures >> DTC C0000: Vehicle Speed Information Circuit Malfunction >> Circuit Description

Circuit Description

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The rear wheel steering control module receives a vehicle speed signal input from the powertrain control module (PCM) via the vehicle speed signal circuit and also receives vehicle speed data over the serial data class 2 circuit. Once vehicle speed has been detected, the rear wheel steering control module compares the two inputs for accuracy. The module calculates the vehicle speed from the PCM with a resolution of 0.80 km/h (0.5 mph) from 0-209 km/h (0-130 mph). The discrete VSS signal must be present for rear wheel steer operation. The class 2 information is only used for comparison calculations.

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