Saab Alarm Siren Rebuild, Battery Replacement (Fix Random Alarms) - Trionic Seven

Full guide for rebuilding the Saab 9-3 and Saab 9-5 Alarm Siren with battery replacement. This is the fix for the "Service Theft Alarm" or "Theft Protection Failure" warnings, and also stops random alarms from occurring.

This is part 2, check out part 1 here: https://www.youtube.com/watch?v=TLYQ8VvEZlg

Part 3 is here: https://www.youtube.com/watch?v=LQ0L_IGPEOw

Parts needed: Two Sanyo CR17335 Lithium Batteries. Do not use CR17335SE batteries, they will not work.

I purchased batteries from eBay: http://www.ebay.com/itm/322468835797

CR123A batteries can also work, but you will need to attach the solder tabs.

You need three electrolytic capacitors:
C1: 16 V, 10µF
C2: 10 V, 220µF
C4: 25 V, 330µF
While higher voltages work, make sure the capacitors don't become too big. You need everything to fit in the siren housing.

You also need conformal coating. I used PRF 202 spray, but there are many options.

Photo credit for removing alarm siren: http://photo.platonoff.com/Auto/20071020a.Saab_9-5_Theft_Alarm_Module/?all

Svenska: Komplett guide till att renovera larmsiren i Saab 9-3 och 9-5. Denna guide visar hur man byter batterier och kondensatorer i sirenen vilket löser problemet med att larmet går utan orsak.

This video was shot at Admittansen, the electronics lab at Linköping University, Sweden.

Trionic Seven is the YouTube channel for Saab enthusiasts.

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