Description & Operation
When ignition switch is turned to START position, a 12-volt signal is sent through CRANK SIGNAL BCM, CLUSTER fuse (10-amp) in fuse block under instrument panel, to Body Control Module (BCM), Instrument Panel Cluster (IPC), and Powertrain Control Module (PCM), to notify system that a crank status has been requested. PCM verifies through BCM that PASSLOCK(R) theft deterrent system has enabled engine to start and then sends 12-volts to PCM BCM U/H RELAY (10-amp) fuse in fuse block to coil side of crank relay. PCM then grounds crank relay circuit when all parameters for starting engine are met. This closes crank relay allowing battery voltage to flow through CRANK fuse (40-amp) and CRANK RELAY in underhood fuse block, to Park/Neutral Position (PNP) switch, to starter solenoid "S" terminal, closing solenoid contacts and allowing battery voltage to flow through solenoid windings.
When voltage is applied to solenoid windings, this creates movement of solenoid plunger and shift lever, causing drive pinion to engage flywheel and close solenoid switch contacts. See Fig 1 . When solenoid switch contacts close, starter motor energizes and cranks engine. As engine starts, pinion overrun clutch protects armature from excessive speed until ignition switch is released from START position, opening solenoid contacts allowing solenoid plunger return spring to disengage pinion gear from flywheel.
PG starter motors are non-repairable. Starter motors are non-serviceable and must be replaced as a single unit.