PATS reset

[tractmec]

For the past few months I was randomly blowing the PATS fuse (36). It had blown 3 times but not in a row. This last go round, it immobilized. I checked the starter (jumped it), tested the engine fuse box, tested all the relays, inspected and tested all the fuses, tested the battery. All came back good and had no signs of damage, with the starter also turning over when jumped. I then went to the interior fuse box (were 36 is located on my car). Again I tested all the fuses and inspected them, tested the relay, inspected the box, and unplugged and inspected all the harnesses. Everything tested good and looked good there. I ran forscan with the recommended vlinker fs cable.

The scan showed p1260, and also dtc U300a-94. From there, I replaced the ignition switch (I had also noticed some play in the ignition and the key not locking into place correctly). I then attempted to restart the vehicle using both keys I had, which prior to the p1260 started the car without issue. With the ignition switch replaced it stopped coding u300a-94. It wasn't reading the keys. I attempted to just reprogram them to the vehicle using Forscan and going through the process it recommended of deleting and then adding them back to the vehicle. I went through the entire process then failed at the reprogram.

From what I've seen online, I cant program 'new' keys while the p1260 is active? Which may be why they failed to program... I haven't had a chance to pick up new batteries yet but will be doing so on Thursday. I have a locksmith coming Friday. He states he can reset the immobilizer and program the keys. If that doesn't work, i plan on ordering a replacement ignition transceiver ring.

When I get some time on Thursday I'll add the forscan info.

I will Echo Boosted Diesel here as well: A Blown fuse is not a cause it is always a result! Fuse 36 in the Mustang Provides VPWR (System Voltage in Start or Run see attached diagram) to both the IPC and the PATS transceiver both of which are PATS control modules(IPC contains the PATS memory and program control and the Transceiver, Around the key barrel, reads and transmits the Key signature)! Something in one or the other of these two modules or in wiring, is the problem and is causing the P1260 to set as it is probable the key signatures are not being read or transmitted!
A simple DTC check for a missing DTC B1601(unprogrammed Transponder was read) with an unprogramed key used to turn the ignition on would have revealed this as a possibility!

A continuity check with an Ohm meter(Both ends disconnected and the fuse pulled) of the wires shown in the attached PDF should be done before condemning either module to make sure there is no wire shorted to ground or shorted in the harness(no reading between the connections) and 5 ohms or less, end to end on each of those wires!

Hope that was Understandable?

[boosted_diesel]

For the past few months I was randomly blowing the PATS fuse (36). It had blown 3 times but not in a row. This last go round, it immobilized. I checked the starter (jumped it), tested the engine fuse box, tested all the relays, inspected and tested all the fuses, tested the battery. All came back good and had no signs of damage, with the starter also turning over when jumped. I then went to the interior fuse box (were 36 is located on my car). Again I tested all the fuses and inspected them, tested the relay, inspected the box, and unplugged and inspected all the harnesses. Everything tested good and looked good there. I ran forscan with the recommended vlinker fs cable.

The scan showed p1260, and also dtc U300a-94. From there, I replaced the ignition switch (I had also noticed some play in the ignition and the key not locking into place correctly). I then attempted to restart the vehicle using both keys I had, which prior to the p1260 started the car without issue. With the ignition switch replaced it stopped coding u300a-94. It wasn't reading the keys. I attempted to just reprogram them to the vehicle using Forscan and going through the process it recommended of deleting and then adding them back to the vehicle. I went through the entire process then failed at the reprogram.

From what I've seen online, I cant program 'new' keys while the p1260 is active? Which may be why they failed to program... I haven't had a chance to pick up new batteries yet but will be doing so on Thursday. I have a locksmith coming Friday. He states he can reset the immobilizer and program the keys. If that doesn't work, i plan on ordering a replacement ignition transceiver ring.

When I get some time on Thursday I'll add the forscan info.

I will Echo Boosted Diesel here as well: A Blown fuse is not a cause it is always a result! Fuse 36 in the Mustang Provides VPWR (System Voltage in Start or Run see attached diagram) to both the IPC and the PATS transceiver both of which are PATS control modules(IPC contains the PATS memory and program control and the Transceiver, Around the key barrel, reads and transmits the Key signature)! Something in one or the other of these two modules or in wiring, is the problem and is causing the P1260 to set as it is probable the key signatures are not being read or transmitted!
A simple DTC check for a missing DTC B1601(unprogrammed Transponder was read) with an unprogramed key used to turn the ignition on would have revealed this as a possibility!

A continuity check with an Ohm meter(Both ends disconnected and the fuse pulled) of the wires shown in the attached PDF should be done before condemning either module to make sure there is no wire shorted to ground or shorted in the harness(no reading between the connections) and 5 ohms or less, end to end on each of those wires!

Hope that was Understandable?

I'll bet your right matey. Given the fuse info you offered it's more likely the transceiver than anything as it seems the other pats stuff works, no comms issues.

Think when he reads this and checks stuff he'll nail it.

[Capnscoobing]

I believe I understand about testing the wires... now I just need to find their location within the vehicle to begin testing them.

When I get a chance, probably this evening, I will also try and attach the active DTC codes.

I appreciate all the help I am getting from you guys.

Also, I found this link for a service manual... I'm not sure if what I need to work with is in it? I'm trying to understand the wiring diagram.

https://www.allcarmanuals.com/data/file ... manual.pdf

[Capnscoobing]

Codes:

===OBD2_PCM DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II (PCM)

===END OBD2_PCM DTC None===

===PCM DTC P1260:00-2F===
Code: P1260 - Theft Detected, Vehicle Immobilized

Status (-2F):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Powertrain Control Module

===END PCM DTC P1260:00-2F===

===APIM DTC None===
Successful DTC reading, no error codes found

Module: Accessory Protocol Interface Module

===END APIM DTC None===

===ABS DTC C0089:73-08===
Code: C0089 - TCS Disable Switch

Additional Fault Symptom (:73):
- Actuator Stuck Closed

Status (-08):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

===END ABS DTC C0089:73-08===

===RCM DTC B0001:13-48===
Code: B0001 - Driver Frontal Stage 1 Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0001:13-48===

===RCM DTC B1211:13-48===
Code: B1211 - Driver Seatbelt Retractor Pretensioner Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B1211:13-48===

===RCM DTC B0020:13-48===
Code: B0020 - Left Side Airbag Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0020:13-48===

===RCM DTC B0002:13-48===
Code: B0002 - Driver Frontal Stage 2 Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0002:13-48===

===RCM DTC B1193:00-8B===
Code: B1193 - Crash Event Storage Full and Locked

Status (-8B):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Restraint Control Module

===END RCM DTC B1193:00-8B===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===IPC DTC B10D8:00-8A===
Code: B10D8 - PATS Key Less Than Minimum Programmed

Status (-8A):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Instrument Panel Control Module

===END IPC DTC B10D8:00-8A===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===BCMB DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module B

===END BCMB DTC None===

===FCIM DTC None===
Successful DTC reading, no error codes found

Module: Front Controls Interface Module

===END FCIM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===GPSM DTC None===
Successful DTC reading, no error codes found

Module: Global Positioning System Module

===END GPSM DTC None===

===FDIM DTC None===
Successful DTC reading, no error codes found

Module: Front Display Interface Module

===END FDIM DTC None===

===GEM/SJB DTC None===
Successful DTC reading, no error codes found

Module: Generic Electronic Module / Smart Junction Box

===END GEM/SJB DTC None===

[Joh150413]

Not sure if this will help or not. From the PCED manual.

QD: DTC P1260: Passive Anti-Theft System

QD1 CHECK FOR PATS DTCS

Repair all PATS DTCs before P1260. Refer to the Workshop Manual Section 419-01, Anti-Theft for System Description, Operation and Self-Test.

Are all PATS DTCs diagnosed?
Yes
GO to QD2 .

No
REFER to the Workshop Manual Section 419-01, Anti-Theft, to diagnose any PATS-related DTCs.

QD2 CHECK FOR ANY OTHER POWERTRAIN DTCS

Repair all powertrain DTCs other than P1260.

Are all other powertrain DTCs diagnosed?
Yes
GO to QD3 .

No
DISREGARD DTC P1260. DIAGNOSE all other powertrain DTCs. REFER to Section 4, Diagnostic Trouble Code (DTC) Charts and Descriptions .

QD3 ATTEMPT TO START THE ENGINE

Carry out a keep alive memory reset to clear DTC P1260. Refer to Section 2, Resetting The Keep Alive Memory (KAM) .
Attempt to start the engine.

Does the engine start?
Yes
No system concerns exist at the present time. For intermittent no start or start stalls, CHECK for intermittent PATS concerns. (PATS cannot stall the engine after 1 second of operation). For intermittent stalls while driving, VERIFY scan tool-to-PCM communication during the concern. If a PCM communication error occurs, the possible causes are: loss of PWR or GND to the PCM, damaged PCM PWR relay, or a damaged EEC PWR diode. REPAIR as necessary.

Clear the PCM DTCs. REPEAT the self-test.

No
DTC P1260 is not the cause of the No Start. REFER to Section 3, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index .

[boosted_diesel]

I believe I understand about testing the wires... now I just need to find their location within the vehicle to begin testing them.

When I get a chance, probably this evening, I will also try and attach the active DTC codes.

I appreciate all the help I am getting from you guys.

Also, I found this link for a service manual... I'm not sure if what I need to work with is in it? I'm trying to understand the wiring diagram.

https://www.allcarmanuals.com/data/file ... manual.pdf

The transceiver ring for reading the key is around the ign barrel.
It'll have a plug connecting it to the car. There should be power ground and signal/communication wires there at minimum.

Codes:

===OBD2_PCM DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II (PCM)

===END OBD2_PCM DTC None===

===PCM DTC P1260:00-2F===
Code: P1260 - Theft Detected, Vehicle Immobilized

Status (-2F):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Powertrain Control Module

===END PCM DTC P1260:00-2F===

===APIM DTC None===
Successful DTC reading, no error codes found

Module: Accessory Protocol Interface Module

===END APIM DTC None===

===ABS DTC C0089:73-08===
Code: C0089 - TCS Disable Switch

Additional Fault Symptom (:73):
- Actuator Stuck Closed

Status (-08):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

===END ABS DTC C0089:73-08===

===RCM DTC B0001:13-48===
Code: B0001 - Driver Frontal Stage 1 Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0001:13-48===

===RCM DTC B1211:13-48===
Code: B1211 - Driver Seatbelt Retractor Pretensioner Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B1211:13-48===

===RCM DTC B0020:13-48===
Code: B0020 - Left Side Airbag Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0020:13-48===

===RCM DTC B0002:13-48===
Code: B0002 - Driver Frontal Stage 2 Deployment Control

Additional Fault Symptom (:13):
- Circuit Open

Status (-48):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Restraint Control Module

===END RCM DTC B0002:13-48===

===RCM DTC B1193:00-8B===
Code: B1193 - Crash Event Storage Full and Locked

Status (-8B):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Restraint Control Module

===END RCM DTC B1193:00-8B===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===IPC DTC B10D8:00-8A===
Code: B10D8 - PATS Key Less Than Minimum Programmed

Status (-8A):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Instrument Panel Control Module

===END IPC DTC B10D8:00-8A===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===BCMB DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module B

===END BCMB DTC None===

===FCIM DTC None===
Successful DTC reading, no error codes found

Module: Front Controls Interface Module

===END FCIM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===GPSM DTC None===
Successful DTC reading, no error codes found

Module: Global Positioning System Module

===END GPSM DTC None===

===FDIM DTC None===
Successful DTC reading, no error codes found

Module: Front Display Interface Module

===END FDIM DTC None===

===GEM/SJB DTC None===
Successful DTC reading, no error codes found

Module: Generic Electronic Module / Smart Junction Box

===END GEM/SJB DTC None===

The p1260 again is just a theft detected code.
You can try removing the kam (keep alive memory) fuse underbonnet for ten mins to reset that.

If that doesn't remove the code then try disconnect the battery for ten mins. Then with the battery terminals sill disconnected, touch the two car side terminals together for 5 seconds. This will discharge any capacitors within modules and might remove the code.

I see from the fault data that this car has probably been in an accident and been repaired? I know this from all the srs airbag system faults. If this is the case then this car may well have damaged wiring as a result of the crash and that may be your issue. It would tie in with the blown fuses too.

If there is any more info you should tell us it all as it doesn't help finding out things later.

[Capnscoobing]

The vehicle blew the 36 fuse prior to the accident. I had blown the 20a ipc fuse just prior to the vehicle immo locking me out. The fuse was replaced and I'm not finding any issues with the ipc functioning. It said the keys were not programmable keys so I'm wondering if there is a transceiver issue? Sorry I've been ridiculously busy with work and haven't had a chance to continue chasing this down. I did a rough inspection of the wiring around the steering column and didnt see anything immediately wrong. I've pulled off the transceiver ring and picked up some new multimeter leads to do some voltage and continuity tests but haven't had a chance to get to them. I cant find any other way of just testing the transceiver...

As before, I greatly appreciate the help and will continue updates

[boosted_diesel]

Any cheap rf detector shoupd pick it up. When the key with a transponder is near the ring, the transponder powers up and transmits, a rf detector will pick that up.

[Capnscoobing]

Update:

When testing the ignition transceiver wiring into the plug, it seems that the wiring won't ground properly. It reads .04 to .11, changing. When I move my ground probe to the metal of my steering column it reads 11.8 to 12.1.

I wonder if that's causing the issues and the fuses to blow.

Now I need to figure out where the connection for the ground breaks? I can see a grounded wire under the dash... all the wiring harness is wrapped together and wound around hard to reach places though.

[tractmec]

Update:

When testing the ignition transceiver wiring into the plug, it seems that the wiring won't ground properly. It reads .04 to .11, changing. When I move my ground probe to the metal of my steering column it reads 11.8 to 12.1.

I wonder if that's causing the issues and the fuses to blow.

Now I need to figure out where the connection for the ground breaks? I can see a grounded wire under the dash... all the wiring harness is wrapped together and wound around hard to reach places though.

OK Back up a little Are you saying that with the Transceiver disconnected and the ignition in run or on, you are only getting .04 -.11 Volts(Digital meters are famous for this kind of reading on dead or open circuits and why I do not like them) when checked from Transceiver pin 1 VPWR (Blue-Brown wire) to Pin 2 - Ground (Black-Violet Wire)?
VPWR = Battery Voltage with Ignition in start or in run!

What kind of Ohm Continuity reading are you getting from the Transceiver Pin 2 Black-Violet wire ( transceiver Disconnected) to a good ground(like where you got the 12.1 Volt reading)? It should read less than 5 ohms! Higher than that or reading Infinity or 0.L(My digital Clamp meter on an open circuit) on that circuit will indicate the circuit is open or broken!

IF you are getting 11.8 - 12.1(Low for a fully charged battery) from Pin 1 to a good Ground and infinity/open on the ohmmeter from the pin 2 to good ground then you just found one reason(I would say the reason) why you have been chasing your tail around the original transponders not programmable and this has nothing to do with a P1260 code not clearing!

Your PATS transceiver is not actually powered up so there can be no send/receive from or transmit to the Key transponder and the IPC!

That Black-violet wire is harnessed into the main harness(as is the VPWR and TX/RX circuits) along the bottom of the dash and grounds to a Ground bolt numbered G201 under the Glove box! Grounding that pin 2 Black-Violet wire can be accomplished any where you can get a good metal bolt connection! I would cut (leave enough wire showing from the harness for future diagnosis and from the transceiver connection for a splice) and splice wire in to and by pass that wire and ground connect the Transceiver to a bolt in the column or Dash for now(it does not have to go to G201 but you could string the wire to there if you wish)!

Broken Grounds usually do not cause Blown fuses by themselves but if the V power circuit some how got pinched in what ever started this fiasco it could have got pinched hard enough into a harnessed ground wire(and there are many in that dash harness and grounded to that same G201 bolt)!

That same fuse (36) also Provides VPWR(Battery voltage with Ignition in start or in run) to the IPC Connector C220 Pin 3 and branches out of that same main Dash Harness!
Look for any Harness damage along the bottom of the dash for a start or going up to the IPC and the column!

Does not mean you do not have a bad/Shorted transceiver either(it can happen but rarely) but get the Transceiver properly powered first!

Start with that and hope it helps?