Sentry Key Immobilization System reset?

[abhester3]

I swapped in a spare ECU on my '05 CRD (getting original reflashed) but have set off the Sentry Key Immobilization System, the small red light by the gas gauge stays on, it cranks over but it's a no start. Tried unhooking the battery and then using the door lock controls on the keys but no luck...

Any experience out there with this?

 

[kb0nly]

Should be fine once you put your ECU back in, seems to me i read something about the ECU won't work until it's reflashed to match the vehicle it was put into.

 

[Powerslave]

The (SKIS) prevents the engine from running for more than 2 seconds unless a valid electronically encoded key is in the ignition switch. Since your ECU is not in the vehicle, you would need the KEYS from the vehicle it came from, though I read that this is in the TCM, so probably a combination the ECU is foreign to the TCM. This is part of, of course, the Federal Motor Vehicle Theft Prevention Standard. There is supposed to be a way to bypass it, I can't find it, but a $147.00 device can be installed to bypass it. I lost the information on that. Can you not follow the program procedures like you would, do add another KeyFob to the system? Just a thought, this was put into the vehicles for a reason...

 

[Powerslave]

This was some stuff I could find, but may not help, probably not...

SECURED ACCESS METHOD
The Secured Access method applies to all vehicles. This method requires the use of a DRBIII scan tool. This method will also require that you have access to the unique four-digit PIN code that was assigned to the original SKIM. The PIN code must be used to enter the Secured Access Mode in the SKIM. This PIN number may be obtained from the vehicle owner, from the original vehicle invoice, or from the DaimlerChrysler Customer Center. Refer to the appropriate diagnostic information for the proper Secured Access method programming procedures.

CUSTOMER LEARN METHOD
The Customer Learn feature is only available on domestic vehicles, or those vehicles which have a U.S. country code designator. This programming method also requires access to at least two valid Sentry Keys. If two valid Sentry Keys are not available, or if the vehicle does not have a U.S. country code designator, the Secured Access Method must be used to program new or additional valid keys to the SKIM.

The Customer Learn programming method procedures are as follows:
(1) Obtain the blank Sentry Key(s) that are to be programmed as valid keys for the vehicle. Cut the blank key(s) to match the ignition switch lock cylinder mechanical key codes.
(2) Insert one of the two valid Sentry Keys into the ignition switch and turn the ignition switch to the On position.
(3) After the ignition switch has been in the On position for longer than three seconds, but no more than fifteen seconds, cycle the ignition switch back to the Off position. Replace the first valid Sentry Key in the ignition switch lock cylinder with the second valid Sentry Key and turn the ignition switch back to the On position. The second valid Sentry Key must be inserted in the lock cylinder within fifteen seconds of removing the first valid key.
(4) About ten seconds after the completion of Step 3, the SKIS indicator in the instrument cluster will start to flash and a single audible chime will sound to indicate that the system has entered the Customer Learn programming mode.
(5) Within sixty seconds of entering the Customer Learn programming mode, turn the ignition switch to the Off position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the On position.
(6) About ten seconds after the completion of Step 5, a single audible chime will sound and the SKIS indicator will stop flashing, stay on solid for three seconds, then turn off to indicate that the blank Sentry Key has been successfully programmed. The SKIS will immediately exit the Customer Learn programming mode and the vehicle may now be started using the newly programmed valid Sentry Key. Each of these steps must be repeated and completed in their entirety for each additional Sentry Key that is to be programmed. If the above steps are not completed in the given sequence, or within the allotted time, the SKIS will exit the Customer Learn programming mode and the programming will be unsuccessful. The SKIS will also automatically exit the Customer Learn programming mode if it sees a non-blank Sentry Key transponder when it should see a blank, if it has already programmed eight (8) valid Sentry Keys, or if the ignition switch is turned to the Off position for more than about fifty seconds.

NOTE: If an attempt is made to start the vehicle while in the Customer Learn mode (SKIS indicator flashing), the SKIS will respond as though the vehicle were being started with an invalid key. In other words, the engine will stall after about two seconds of operation. No faults will be set.

NOTE: Once a Sentry Key has been programmed as a valid key to a vehicle, it cannot be programmed as a valid key for use on any other vehicle.

 

[KYLiberty]

You need to put the original ECU back in it and drive it over to a dealership. The spare will need to be put back in, and then they need to program your keys (make sure you have both) and your VIN to it. It should work then. Once that is done you can swap the ECU's back and send your spare to be reprogrammed. That way you also have your original unmodded if you ever need it.