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Topic: SYS and Security flashing

in Forum: C4 General Discussion

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SYS and Security flashing

Posted: 10/4/09 7:18am Message 1 of 4
hd98fxdl
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Dardenne Prairie, MO - USA
Joined: 10/3/2009
Posts: 7
Vette(s): 1993 Ruby Red Coupe
Periodicly the display on the speedometer will flash SYS and the Security light will flash.  It causes the instant mpg to go to 99.  The majority of the time the Service ASR light comes on and stays on.  The SYS and Security lights will flash, then stop.  They repeat this several times and then stop.
 
Any ideas why this is happening and what I can do to correct this?



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SYS and Security flashing

Posted: 10/4/09 8:16am Message 2 of 4
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Adams' Apple
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Duncanville, TX - USA
Joined: 3/18/2009
Posts: 2246
Vette(s): 1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.
Could be a ground issue either in the cluster itself, or one of the harness grounds at the engine.
Have you tried to scan for any codes that may be popping up?
There may also be an issue with the BCM/CCC(body control module/central control module) or it's wiring, as that is what controls the lights/info on the display.
Intermittent electronic stuff is a major pita to diagnose...
I would start with scanning for ANY codes, and go from there...



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SYS and Security flashing

Posted: 10/4/09 3:16pm Message 3 of 4
hd98fxdl
Standard Member
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Dardenne Prairie, MO - USA
Joined: 10/3/2009
Posts: 7
Vette(s): 1993 Ruby Red Coupe
I will check the grounds.  I am afraid it might be the BCM/CCC, I also get the service ABS periodically.
 
Thanks



SYS and Security flashing

Posted: 11/2/09 11:24am Message 4 of 4
vette079
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Joined: 3/22/2009
Posts: 18
Check battery, alternator and/or their connections.
 
I had a battery ready for retirement, and the sys also started flashing.
 
You have multiple computers showing lights like abs and asr, it can be those computers getting too little power to do their job.
 
Disconnecting a stock bose radio also causes the sys light to flash...
 
Just a thought... 



in Forum: C4 General Discussion


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