I need help on my c43 wont start just a clicking sound coming from the comfort module but all power are okay window, doors, seats, everything but it wont turn over when I turn the key to start position but it has BAS/ESP light on but I have this for a month until now I wonder if cause the no start. please help.

1999 C43 with 154,000km

 

Judging by your apparent knowledge I guess we're safe to assume you've already made sure the battery is charged appropriately.

Where is this "comfort" module you speak of? The one in the trunk beside the battery?

Perhaps your immobilizer has tripped? Key has failed?

 

yes I did charge the battery but still nothing when I turn the key to start position and for that module front floor passenger side it has a sticker k12 but I search the part number it say comfort module. any Idea what have cause this no start? thank you for the reply

 

how do I check if my immobilizer tripped? the car still recognize the key it locks unlocks and turn on the all the powers but it wont start? thank you

 

I'm not sure but it could be your crank postion sensor too. Our c43s tend to have those problems. If the crank postion sensor goes bad then the car won't start. Or could die out while driving. That's what's happening to me right now. I'll start my car and it will die immediately. I'll have to try two times just to start it lol. You could try to replace the sensor and see if that helps.

 

I was thinking it might be the starter or battery cause mine was running smooth and now it wont start when I turn the key nothing happen all light and powers are on and working except it wont crank.

 

If your light are on and bright and all the other electrics work normally, the battery is fine. How much is the voltage across the + and - poles?

 

it's reading 13.3v but I am gonna get a new one tomorrow cause i think the battery of this is old, I hope it will fix it. let you guys know and I hope it's not cold like today -43 here

 

-43 Fahrenheit I imagine, that will kill any battery and freeze your ***** off!

 

it's Celsius but I am gonna get a new battery today cross finger I hope it will start.

 

probably you battery froze and died?

are you located near Siberia having -43C?
you must be near Scandinavia or Russia, these areas are known to be cold as hell is hot?
that's seriously cold freezing your nuts off!

antifreeze did you check this on your car?

 

No I am in Canada Winnipeg MB yes it is cold here what do you guys think of AGM battery?

 

Battery is standard factory battery. I just installed the 3rd factory battery in my C43 in 15 years. 122,000 miles, can't beat that. Cost $230 US. And I live in So Calif desert, we have 4 months of 105 to 115 degree temps, AC runs almost year round.

 

Replaced factory original battery in my 1994 C280 in about 2003 with 150k miles. Never bought another battery, sold it in 2011 with 255k miles.

 

It is probably your starter solenoid. To check it, disconnect the wire coming to it from the ignition start circuit. Then with a 20 amp fused lead, run 12 volts to it from the 12 V main terminal on the starter. It is the major cable that comes from the battery. If it does not engage and turn the engine than it is your solenoid. If it cranks the engine than it is in the ignition start circuit.

Crank sensor has nothing to do with this problem.

 

okay I check my starter and it fail. I am just wondering if I can use the starter out from the 2001 s500? I am just wondering if they are compatible

 

Starters for all M112 and M113 's are the same as long as they are on same side of the block.

 

should I replace the whole thing or just solenoid ? I am new to this German engineering

 

I'd just change the whole thing, they are pretty cheap. Used should be ok, they rarely give trouble anyway.