Safety Recall N23 for WH anyone had it done yet?

[Clarky]

Originally Posted by roscoea26

Lets hope they are going to replace the FDCM; I can't see how reflashing a cracked circuit board, which seems to be the root of the problem?

Cracked circuit board is actually in the actuator not the FDCM. Not everyone who has the no low issue has a faulty circuit board because if they did C/F would be totally in there rights to say the flash is working as intended & showing up a fault.

The actuator's (transfer case motor's) cracked circuit board was causing a fluctuating voltage to the FDCM that simulated the neutral shifting sequence causing the fault. A proper fix would have been a redesign of the actuator (transfer case motor) giving it improved resistance to circuit board failure but they went the path of trying to detect the fault not fix it hence we are where we are now

Lets say all 468,700 recalled Grands & Commanders (wiki figure) needed an updated actuator to eliminate any chance of the fault reoccurring, at a conservative $300 each ($900 to us) that's $140.5 million US dollars! one hell of a tax deduction

bjm, if your latest update proves to be a success still in 6 months time ozjeepster is going to be a very busy boy

[bjm]

There are owners in US who have retained the old actuator when replaced pulled them apart and found no cracked circuit boards.Also the new actuators had the same build date stamped on them etc as the one replaced.Is it a random problem.I also was told by DSM , they were told by FC not to fit any more actuators as they were not the problem.!!!Why are secondhand pre N23 FDCMs when fitted fixing the problem even when no new actuators fitted.??

[JamesLaugesen]

Originally Posted by bjm

There are owners in US who have retained the old actuator when replaced pulled them apart and found no cracked circuit boards.Also the new actuators had the same build date stamped on them etc as the one replaced.Is it a random problem.I also was told by DSM , they were told by FC not to fit any more actuators as they were not the problem.!!!Why are secondhand pre N23 FDCMs when fitted fixing the problem even when no new actuators fitted.??

"cracked circuit board" is often used just to dumb things down. When in reality an issue might be a fractured or fatigued conductor, de-balled BGA, or even just some corrosion. I very-much doubt that anything is literally "cracked".

[roscoea26]

Originally Posted by Clarky

Cracked circuit board is actually in the actuator not the FDCM. Not everyone who has the no low issue has a faulty circuit board because if they did C/F would be totally in there rights to say the flash is working as intended & showing up a fault.

The actuator's (transfer case motor's) cracked circuit board was causing a fluctuating voltage to the FDCM that simulated the neutral shifting sequence causing the fault. A proper fix would have been a redesign of the actuator (transfer case motor) giving it improved resistance to circuit board failure but they went the path of trying to detect the fault not fix it hence we are where we are now

Lets say all 468,700 recalled Grands & Commanders (wiki figure) needed an updated actuator to eliminate any chance of the fault reoccurring, at a conservative $300 each ($900 to us) that's $140.5 million US dollars! one hell of a tax deduction

bjm, if your latest update proves to be a success still in 6 months time ozjeepster is going to be a very busy boy

I had a new actuator fitted to my WH in January 2014 which seemed to fix the problem I checked 4x4 low every day for a month and thought the problem had been fixed about 2 months later I tried it and no 4x4 low. If the actuator motor is the problem I would have thought by replacing it would have solved the issue but it hasn't. My understanding is that there is no circuit board in the actuator it's simply and electric motor that operates a lever to slide another lever to select low rang on and off...maybe I'm wrong.

My understanding has always been that the cracked circuit board is in the FDCM and rather than replace these Modules which will cost them millions they are trying the easy way out and doing these reflashes to try and work around the crack using voltage variances somehow ?

[roscoea26]

Originally Posted by JamesLaugesen

"cracked circuit board" is often used just to dumb things down. When in reality an issue might be a fractured or fatigued conductor, de-balled BGA, or even just some corrosion. I very-much doubt that anything is literally "cracked".

I have to say I've been skeptical about this cracked circuit board thing how could there be so many of them did someone drop a huge box of them and crack the lot

[ozjeepster]

Your old actuator build date
And your new actuator


OIIIIIIIO

[Clarky]

Nope its in the actuator, that's why they were changing them. Proper term for the part is encoder

The 245 transfer case is an automatic 4WD system that shifts in and out of 4WD modes and ranges automatically or based on customer inputs. The shifting is accomplished with an electric actuator (composed of motor, gearing and electric position encoder) and is commanded by the final drive control module

Read the attached PDF
http://www-odi.nhtsa.dot.gov/acms/cs...3V175-1433.pdf

They changed mine to and there was nothing wrong with it.