B1385 CHEVROLET – Device Ignition START Circuit

B1385 CHEVROLET Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B1385 CHEVROLET Possible Causes

Faulty Ignition Switch,Ignition Switch harness is open or shorted,Ignition Switch circuit poor electrical connection,Faulty Body Control Module (BCM)

B1385 CHEVROLET Description

The Body Control Module (BCM), monitors the ignition inputs OFF, ignition 3, crank and ignition 1 supplied from the ignition switch. The BCM uses the sequence that the signals appear and their voltage levels to determine the power mode called for by the vehicle operator using the ignition switch. A 12-volt reference voltage is supplied by the BCM to the ignition switch over a discrete circuit. The ignition switch uses this voltage for power mode signal discrimination. When the operator places the Ignition switch in the Start position, the Crank circuit delivers the signal to the BCM.