Here is some more information. It is part of a thing I have been working on. I gathered much of this from a FSM and then tried to turn it into English.....sort of.
Circuit A1 from fuse 4 in the POWER DISTRIBUTION C ENTER (PDC) supplies battery voltage to the ignition switch. Depending upon position, the ignition switch powers circuits A21, A22, A31, & A41.
In the START position, the ignition switch connects circuit A1 to A41.
• Circuit A41 connects to the coil side of the starter motor relay.
• The other (coil) side of this relay is a ground supplied by the NSS switch in the automatic transmission. For a standard shift, a ground wire on the dipstick tube hold down bolt supplies that needed ground.
• One the other side of this relay is the power from the 40 AMP fuse in the PDC that when A1 connects to A41 the relay closes, IF it has ground. Then battery voltage goes to the starter motor solenoid. That is the power for your starter motor solenoid. The start itself should always have power from the battery + battery cable.
START OR RUN POSITION
In the Start or RUN position the ignitions switch also connects circuit A1 with circuit A21.
• The A21 circuit connects to fuses 5 & 9 in the fuse block.
• Fuse 9 powers circuit G5.
• Fuse 5 powers circuit G50 which supplies power to the coil side of the Automatic Shut Down (ASD) relay.
• Circuit G5 powers the buzzer module.
• Circuit G5 also splices to power the daytime running lamps module if it is a Canadian model, the AC compressor clutch relay, the heated rear window relay, and the gauges and indicator lamps in the instrument cluster.
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