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Posted to Technical Discussion Forum on 12/20/2013 13 Replies

I recently was asked to program a SJB (Smart Junction Block) for another mechanic. I have the factory IDS system. Every time you goto program it (PMI) it just says "Battery voltage to low. Make sure vehicle battery is charged". The company we purchased the IDS from was here at the time and we swapped all cables, vcm, etc. with same error message. We tried to do Built-Data but that as well said it failed.

My main question is - how exactly does the FEPS circuit work? From what I understand the scanner will put 18v on the line, and the PCM will see that and allow programming. Why is it I can reprogram the PCM, but not the SJB? This vehicle is a 2011 in like new condition. No add on wiring, etc.

Why would one be unable to program this with a factory tool? I have programmed many many modules in the past - but never a SJB. We ohmed the wire going to pin 13 (FEPS) and it is connected. If you check it with a test light when you goto program there is never any power supplied.

Any suggestions?

Todd Gehring
Wales Auto Repair Inc
North canton, Ohio, USA

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