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My 03 Expy won't shut off with the key removed. I started the truck, unplugged the ignition harness(bottom left of the steering column) WITH THE KEY REMOVED stays running so it's not the ignition. I pull the PCM relay to shut it off and when I do R203 buzzes(soldered center relay). I plug the PCM relay back in, everything powers up as if the truck is running but it's not, R203 no longer buzzes and I am unable to start it as well. (Like it thinks it's running) I am considering getting a new distribution panel/fuse block thinking maybe it has an issue internally, like a bussbar is shorted or something. I took the distribution panel completely apart there are no signs of moisture or heat on the PCB or any of the soldered relays. I previously replaced it due to the infamous R203 issue, this one looks brand new, this is the top but the bottom looks great too, no signs of heat or corrosion etc. I even cut the cover off the center relay very carefully using a razor knife and the relay "wiper" moves fine and the contacts look clean as well. Anybody ever run into this before? Help please.
Do you have remote start ? That has been known to cause this issue. ( Or aftermarket car alarm...) .
New ignition switch is $30 on Amazon if it's worth a try.
New ignition switch is $30 on Amazon if it's worth a try.
The remote start is a good thought, but for the new ignition switch I can't see that helping seeing as how he disconnected the ignition switch harness and it still kept running. To me, if there is no remote start, it seems like there is a short or a relay stuck in the ON position somewhere.
Ok, I found the circuit that is giving the signal. I pull fuse 27(5A) and everything works normally with the key/ignition except the BSI(brake shift interlock) which is normal if you don't energize a solenoid it won't work. The OM says that fuse protects the following circuits:
Compass (disconnected permanently)
Reverse sensing system module (have but don't see the issue being related)
BSI (works fine when fuse installed)
Overdrive cancel switch (no change when disconnected with fuse installed)
Air suspension module (run/Sense) no air ride in my truck but this seems like it would be the signal that is present since my truck will normally start, go into gear and park and just NOT shut off. Does anyone know if the BSI solenoid has a "proof" or feedback circuit (more than just the 2 wires to the solenoid coil) that would make the truck think it's in a gear other than park if the actual plunger is in any position other than, let's call it PARK ( fully extended)? It would have to have that circuit to make it the problem. Hypothetically IF the solenoid is working fine but an auxiliary switch isn't opening when the truck is in park it would think it's in drive. But to my knowledge, if you remove the key in gear, the truck would and is supposed to shut off... so, FML
Ok... Just got home and hopped in my truck, NO key in ignition and f27 removed still. Put my foot on the brake, brake lights come on and the BSI drops and I can put it in gear...without a key. Unless I'm missing something that means I have 12v to the brake pedal switch, which I should only have in start or run. I disconnected the ignition harness as well, same thing.
The only way fuse 27 can backfeed power to an ignition circuit is in pin 3, through the interlock microprocessor, and out pin 4. See the attached PDF.
Where is the interlock processor? I see three wires to my BSI, one white, one green and one black. I know something is hot all the time (the circuit through the brake pedal position switch)put my foot on the brake my BSI plunger pops up and the head tips but no key in the ignition.
f27 removed still. Put my foot on the brake, brake lights come on and the BSI drops and I can put it in gear...without a key
That's normal, it how it's supposed to work. Same conditions, at the BSI, as the manual bypass procedure.
that means I have 12v to the brake pedal switch, which I should only have in start or run.
It's an ALWAYS HOT circuit.
The only way fuse 27 can backfeed power to an ignition circuit is in pin 3, through the interlock microprocessor, and out pin 4
It would be more likely that there's simply a connector or wiring harness fault that the described path. The "interlock processor" is integral to the BSI module, it is not separate. Simply unplug the BSI module and see if the phantom power source goes away.
BTW, you didn't respond as to whether or not a remote start/alarm system is installed. That's important to know...
That's normal, it how it's supposed to work. Same conditions, at the BSI, as the manual bypass procedure.
It's an ALWAYS HOT circuit.
It would be more likely that there's simply a connector or wiring harness fault that the described path. The "interlock processor" is integral to the BSI module, it is not separate. Simply unplug the BSI module and see if the phantom power source goes away.
BTW, you didn't respond as to whether or not a remote start/alarm system is installed. That's important to know...
The interlock is on the lower right side of the column just under the ignition key mechanism. Take off the lower column cover. The interlock has a push button plunger on it ( for manually unlocking the shift lever...) and those wires you were talking about.
Did you look near the column to see if there was an interlock processor there?
As noted previously, the" interlock processor"ishown in the schematic is an integral part of the BSI module. See hamfisted's description, previous post.
As noted previously, the" interlock processor" is shown in the schematic is an integral part of the BSI module. See hamfisted's description, previous post.
Go argue with the FSM writers over it. In the FSM it says it's connector is near the steering column. Whether or not that's true is not up to me.
The interlock is on the lower right side of the column just under the ignition key mechanism. Take off the lower column cover. The interlock has a push button plunger on it ( for manually unlocking the shift lever...) and those wires you were talking about.
Is this the brake shift interlock? It is literally mounted directly under the ignition cylinder so I assumed this had something to do with the Ignition
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