or low battery?
SYS flashing.
Thread Starter
Race Director
Joined: Dec 2003
Posts: 14,090
Likes: 925
From: Fremont Ca
2022 C4 of the Year Finalist - Modified
SYS flashing.
I get this flashing at times but not constant.I checked for codes but none at present.Its been awhile since Ive used the A-B terminal trick but checked for codes and got a 12 which If I remember correctly is normal.Any clues?
Instructor
Joined: Mar 2012
Posts: 170
Likes: 0
From: NH
Depending on what year you have you can short pins A to G (pretty sure this is the right lettering, its the top right to bottom left on the DLC) and read the codes out on the speedo. On mine, a 1993, I can read the CCM, ECM, and ASR system codes easily on the display instead of having to count SES light flashes when you short pins A and B.
Race Director
Joined: Oct 2005
Posts: 11,759
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
If your still using the factory stereo, then my bet is on the battery also.
An SYS flashing every so often indicates an electrical issue, and the most likely cause is a low or almost dead battery.
I had that SYS flash every minute or so, and I knew my battery was questionable.
It would still start the car, but you could tell it wasn't turning it over very fast.
If it would have been the middle of winter or heat of summer, it probably wouldn't have had enough to turn the engine over.
I replaced the battery and the flashing SYS went away.
An SYS flashing every so often indicates an electrical issue, and the most likely cause is a low or almost dead battery.
I had that SYS flash every minute or so, and I knew my battery was questionable.
It would still start the car, but you could tell it wasn't turning it over very fast.
If it would have been the middle of winter or heat of summer, it probably wouldn't have had enough to turn the engine over.
I replaced the battery and the flashing SYS went away.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
I agree with the battery theory, SYS comes and goes. If it is hot where you are and the battery is over 3 years old, it definitely might be a suspect as the cause.
I think most of us has gone thru this, me included.
I think most of us has gone thru this, me included.
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