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Registered
Join Date: Dec 2007
Location: Vancouver, b.c.
Posts: 71
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Alarm issues
I have a weird problem with my '88 S4. Every once in a while the car won't start, everything energizes when I turn the key but the start doesn't turn.
I check relays and narrowed it down to the alarm system, I can disconnect the battery and it re-sets itself and everything works fine for a while. I suspect a faulty Alarm control unit (behind the glove box). I want to by-pass the factory alarm to confirm my suspicions. The factory repair manual states; " Pull off plug Z on the central electric board and bridge terminal 1 and 6 on central plug, this will disable the alarm" Anyone know where this plug Z is located? thanks |
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07-11-2009, 07:34 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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All the plugs on the central electric panel have a letter ID, guessing Z is one of them.
I thought factory alarm was crank and no fuel? |
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07-11-2009, 11:16 AM
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yes..all the plugs are lettered A-Z in the pass' side footwell
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John ......... 1978 Porsche 928 5sp LSD 1982 porsche 928 5sp LSD |
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07-11-2009, 12:12 PM
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Registered
Join Date: Dec 2007
Location: Vancouver, b.c.
Posts: 71
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Thanks, I'll have look for the plug in the fuse panel.
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07-12-2009, 08:31 AM
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928-Electrics Guy
Join Date: Jun 2007
Location: Phoenix AZ
Posts: 715
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The alarm does not disable the starter - look elsewhere - probably in the starter circuit - most likely the park interlock (neutral safety) switch.
Alan
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1994 928 GTS Black/Black Manual |
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07-13-2009, 09:57 AM
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Join Date: Dec 2007
Location: Vancouver, b.c.
Posts: 71
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My S4 is a manual, I didn't realize that the 5 speed cars have a park neutral switch?
When I re-set the alarm system the car starts everytime. I've checked and replaced the starting circuit relay with no difference....but I'll investigate further. Thanks |
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07-13-2009, 10:26 AM
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928-Electrics Guy
Join Date: Jun 2007
Location: Phoenix AZ
Posts: 715
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Manual Transmission cars do not have a neutral safety switch (I assumed AT since you didn't say and it the most common) - but they do have all the wiring for one (so there is just a jumper where it would connect in the area above (and forward of) the battery box.
You don't have a "Z plug" those directions are for a <'85 vehicles. You can link CE pins B23 & F25 to defeat the alarm disable feature - however this really only affects the LH & Fuel pump functions (not the starter) - however you can verify if this solves the problem (maybe someone messed with something?) Alan
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1994 928 GTS Black/Black Manual Last edited by Alan in AZ; 07-13-2009 at 02:03 PM.. |
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07-13-2009, 01:07 PM
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Registered
Join Date: Dec 2007
Location: Vancouver, b.c.
Posts: 71
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Thanks Allan,
Every bit of information helps. It's strange that somehow the starter becomes dissabled but I can still drive the car if I roll it and do a "bump start". Everything I've checked points to an alarm system malfunction but now you have me thinking...I'll be re-checking the starting circuit again. |
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07-13-2009, 02:04 PM
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1978 Porsche 928 4.5
