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Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4063
Experience:  15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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No ignition switch action, triple a replaced battery in r350

Customer Question

no ignition switch action, triple a replaced battery in r350 2008, now srs lighting up engine cooling fan stays on
JA: There are so many things that can cause battery issues. Some simple, some complicated. The mechanics have tons of experience in that area. Will the car start?
Customer: yes
JA: Glad to hear that. How old is the battery?
Customer: aaa replaced it today
JA: Anything else I can tell the Mercedes Mechanic before I connect you two?
Customer: what does it cost for any info
JA: You just pay a $5 deposit now and the rest only when you get a reply from the Mercedes Mechanic. All of this is 100% satisfaction guaranteed, so you can get a refund if you're not happy for any reason.
Customer: maybe next time .i am very skeptical
JA: Got it. Let's get this figured out. I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the Mercedes Mechanic about your situation and connect you two. You'll be on the road in no time.
Submitted: 10 months ago.
Category: Mercedes
Expert:  Lou P. master tech replied 10 months ago.
Hello , so do you know if at any time any sparks happened or if the battery was hooked up reversed? was the R class ( i will refer to as car) attempted to jump start at any time?
Customer: replied 10 months ago.
yes it was attempted jump start
Customer: replied 10 months ago.
neveer saw sparks
Expert:  Lou P. master tech replied 10 months ago.
ok, thanks, ***** ***** happens when you insert the key and turn it? just want to be sure, it does start correct?
Expert:  Lou P. master tech replied 10 months ago.
i ask because your story starts with " no ignition switch action " but then you say it starts and you have the cooling fan on high and the srs light.
Customer: replied 10 months ago.
starts, says srs, engine fan runs hard and says disctonic and speedtronic not working Car has had no problems until this
Customer: replied 10 months ago.
at first after aaa replaced battery nothing worked
Expert:  Lou P. master tech replied 10 months ago.
ok so what changed?
Expert:  Lou P. master tech replied 10 months ago.
i think that there are blown fuses. that is the most common issue when a benz is jump started and battery replaced by a outside company like that . when the fan comes on high that means that there is a communication issue with the engine control module so the fan is kicked on as a safety.
Expert:  Lou P. master tech replied 10 months ago.
assuming you had aaa replace the battery because you dont work on cars yourself?
Customer: replied 10 months ago.
i included that it started like that and triple A replaced battery and now it starts but srs lights up and engine fan runs hard
Customer: replied 10 months ago.
no my wife was stuck and triple a came with battery
Customer: replied 10 months ago.
which fuse, ill look
Expert:  Lou P. master tech replied 10 months ago.
ok, so the first thing i would need to know is what else in the car does not work? try every switch and function and tell me what does not work, that would be the best route to take. then i can check the diagrams and see what they all have in common if anything. see what we can figure out before needing to go to a shop.
Expert:  Lou P. master tech replied 10 months ago.
there are 5 fuse boxes and not all are easily accessible, so checking all the functions of the car is the best route to take for times sake.
Customer: replied 10 months ago.
ok ill check right now. which are most important
Expert:  Lou P. master tech replied 10 months ago.
all of them really , and i dont know what options your car has so i cant say a specific one, just try everything, windows, sunroof, radio, cigar lighter, door locks, wipers, horn, turn signal, everything
Customer: replied 10 months ago.
disctronic and speedtronic inoperative SRS light on and Fan running are the most noticeable
Expert:  Lou P. master tech replied 10 months ago.
yes, srs will be because of low voltage, distronic and speed will be tied into the fan. but without a scanner we dont know why those are all on.
Expert:  Lou P. master tech replied 10 months ago.
so we will try a round about diagnosis and keep fingers crossed
Customer: replied 10 months ago.
turn signal horn dont work also i have scanner but it wouldnt read
Expert:  Lou P. master tech replied 10 months ago.
what brand and model scanner. and please please keep me informed of everything no matter how big or small it seems. the more info the merrier i need you to be my eyes and ears.
Customer: replied 10 months ago.
actron pocket scanner 9550
Expert:  Lou P. master tech replied 10 months ago.
ok, that one will not help . that is a generic scan tool that will only read faults with emissions when the actual check engine light is on. and the term generic does not mean cheap lol it just means not factory.
Customer: replied 10 months ago.
yeah i just got cheap for silly small stuff
Customer: replied 10 months ago.
also says srs front right service required
Expert:  Lou P. master tech replied 10 months ago.
ok that is due to the weight sensor or did aaa remove the seat to replace the battery?
Customer: replied 10 months ago.
i removed seat so battery could be replaced
Expert:  Lou P. master tech replied 10 months ago.
ok, in the future the seat does not need to be removed . and that is why the srs is on as well. once you disconnect a srs yellow connector you need a scan tool to erase the codes . so will you be checking the car tonight? i have to go soon for the night.
Customer: replied 10 months ago.
it began with dead ignition nothing working except radio,no door locks, windows so i jumped and was going to have towed home it still wouldnt start and aaa arrived and said to get battery
Customer: replied 10 months ago.
ill work on it tomorrow
Customer: replied 10 months ago.
no wires were disconnected from the seat
Expert:  Lou P. master tech replied 10 months ago.
ok, ill check back tomorrow have a good night.
Customer: replied 10 months ago.
Are you there?
Expert:  Lou P. master tech replied 10 months ago.
Yes. Been a long busy day. Any news ?
Customer: replied 10 months ago.
So any ideas
Expert:  Lou P. master tech replied 10 months ago.
well, i asked you to check all the functions of the car, that was the last request.
Customer: replied 10 months ago.
I sent them yesterday
Customer: replied 10 months ago.
Turn signal not working, horn not working , Srs on, distribution and speedtronic not working
Expert:  Lou P. master tech replied 10 months ago.
distribution ?
Customer: replied 10 months ago.
It runs
Expert:  Lou P. master tech replied 10 months ago.
ok, so those items wont help, so heres whats next.turn on the ignition and check for power at all the fuses in the fuse box on the right front of the engine bay . theres a little black box. open it up and test for power at all the fuses i need to know if any fuse does not have power. we are not simply looking for a blown fuse although any would be a bonus. what runs??