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Kevin, Master tech
Category: Mercedes
Satisfied Customers: 1821
Experience:  Diagnostic technician
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C320: 2002 c320 srs esp abs lights always come on when starting,

Customer Question

2002 c320 srs esp abs lights always come on when starting, now brake light and sos tileade are illuminated, rear bulbs are good, battery is 100 % alternator is 12.5 v+, there is not a brake light switch on this model. what do you think bas also comes on fuses are all good
Submitted: 1 year ago.
Category: Mercedes
Expert:  Kevin replied 1 year ago.
Hi I'm Kevin can you confirm charging voltage test with car running and see what voltage you have at battery?
Customer: replied 1 year ago.
13, vdc
Expert:  Kevin replied 1 year ago.
Ok that's a bit low looking for 14.2 is perfect check this again with the lights ang rear heated screen turned on I suspect your alternator is failing
Customer: replied 1 year ago.
it will be a 1/2 hour till i am free of dialysis machine
Expert:  Kevin replied 1 year ago.
Ok take your time come back to me when your ready if I'm not online il get back to you as soon as I can
Customer: replied 1 year ago.
14.06 v
Expert:  Kevin replied 1 year ago.
Ok so 14.06 under load 13 normal
Customer: replied 1 year ago.
Expert:  Kevin replied 1 year ago.
It seems a little low to be honest with you I would be starting with an alternator at fault as any low voltage fault will cause system fault lights to illuminate . I would get system scanned for faults to see why the car is putting lights on as it will most likely contain low voltage faults
Customer: replied 1 year ago.
would you suggest a new alternator or just a voltage regulator, also i have been researching this for two years and think it might be the BAS SENSOR so i have one ordered.
Expert:  Kevin replied 1 year ago.
Without codes from system it would be difficult to pinpoint any other fault the only thing I can say for sure is that the charging voltage is low I would replace whole alternator if you get me codes I can help further
Customer: replied 1 year ago.
DTC Code are Speed Control Actuator Assembly Cablr Slack Failure (c1179); Open CIRCUIT HEATING o2 COMPONENT G3/6 RT 02 SENSOR (P0036) : Steering Angle sensor DTC status fault lamp on (c1179) ; BAS release switch OFF A7/751 (180);; BAS diaphramtravel sensor .08 mm A7/761 (182)
Expert:  Kevin replied 1 year ago.
I suspect you have multiple issues and that low charging is just another issue steering angle sensors are common on all mercedes of this age I've not come accross the other faults in the abs I also don't have any info on the bad codes you have given I can open question up if you like there may be someone else online that can help more with this
Customer: replied 1 year ago.
I'm sure you are correct after the bas is replaced (and alternator) i will investigate a new front SAM. anyway thanks for trying, and you may post the question.
Expert:  Kevin replied 1 year ago.
No worries a bit restricted with info for this one I've open question up so someone else can try and help