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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 763 (Instrument Panel, Gages, And Console) >> Diagnostic Information and Procedures >> DTC B1440: Power Mode Master Input Circuits Mismatch >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Class 2 communications will not start until the vehicle systems "on" power mode has been identified. Three discrete wires from the ignition switch contacts are monitored by the instrument cluster (IPC) in order to determine the present power mode (ignition switch position). The IPC communicates the system power mode to all class 2 modules on the class 2 serial data line.

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