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Old 08-17-2010, 10:56 AM   #1
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Location: Derbyshire England
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I Have trickle charged the battery for 12 hours, the charger indicated that the battery was 100% charged. Drove for 1km, and both PSM and ABS lights came on.
The car runs fine,never cuts out, ABS works , the the light on the PSM switch itself doesnt come on on its own ,only the dash warning light and always at the same time as the ABS light. Can this be EITHER the battery or the Alternator?
I appreciate all advice as I am not a mechanic. Thanks
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Old 08-17-2010, 01:42 PM   #2
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I have the same problem on my '03 Carrera 4S right now. I went on a PCA tour last Sunday and drove for ~3 hours before it came on.... Kinda screwy.

I've done some checking and it can be a number of things. Usually something wonky with your brakes/brake lights. My third brake light wasn't working right, so I fixed that, but that still didn't solve the problem. I'm going to check my battery next as I know my alternator is doing fine since the 911 has a voltage gauge. I think my battery is original (7 years old), so it's probably due for replacement or I may just swap in the battery from my Box to see if that fixes it.

The number one cause of this problem that I've seen on other forum discussions though is a bad brake light switch. That's an easy one for you to check. Have a friend push the brake pedal down (or do what I do and use a broom handle) and confirm whether or not your brake lights come on. If they don't, then you probably just need to replace the brake light switch.

Kirk
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2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
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Old 08-20-2010, 06:33 AM   #3
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Thanks Kirk, I have tested the brake pedal and..... guess what.... No Brake Lights !
Fuse ok, Bulbs ok so looks like your spot on with your diagnosis.

I have had the Battery & Alternator checked as this has been known to cause these lights to come on, and they are both 100%

I am having a new brake switch fitted and will post the results.

Many Thanks , Martin
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Old 08-26-2010, 01:26 PM   #4
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Had new brake switch , Problem solved!! PSM/ABS light no longer coming on.
Hope this Feed will benefit someone in the future, and many thanks to everyone who added their feedback to help me.
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