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hi all ,, looking for some advice,, the airbag light fails to light up when key inserted or ignition switched on. its been stood for a few months without use but iv kept the battery optimised, it was plugged into a piwis last year to reactivate the heated seats and headlamp wash as the battery had been flat for a while, they did a code scan and the only fault was nearside rad fan innop, which iv replaced, so 7 months ago no srs fault codes ,, now the system check malfunction light does NOT come on at all, also were is the srs ecu located,, thanks 

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Just a thought, maybe check the battery for proper voltage. If it's slightly low strange things can happen.

 

The PPI of my car alerted that the battery voltage was a little low and warranted replacement. I had my MY04 986 Tiptronic in my possession for one day and everything was operating great, no slow starts, it all seemed normal. Then, driving in manual mode I came to a stop on a slight incline, shifted into first, then got the flashing D/4 alternating led gear indicators, it went into limp mode. The next day I replaced the battery, the day after that I drove it in limp mode to the Porsche dealer that did the PPI. They scanned it and it returned "multifunction switch failed", but after clearing the code and test driving there was no problem found, and that code has never returned. 

 

The only reason anyone could think of is that the slightly low voltage gave the system a conniption fit. The battery that came with the car was about 5 years old, and the car had only driven a few hundred miles in the year previous to my purchase. Just a thought.

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Hello 224STU,

Did you solve your issue  related to teh airbage ligzt which does not turn on. I have the same issue and the same model (997 2005 Cab)... 

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