sudden faults appeared!! - Mercedes Benz SLK Forum

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#1 Old 05-15-2010
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sudden faults appeared!!

hi all,

pulled the car out of the garage this morning, gave it a clean and polish, then went for a drive. noticed that the ASR and ABS warning lights are on. also cruise control stopped working, and roof will not come up!!!

if i push the roof switch forward it flashes, there is a whirring sound for a couple of seconds, but nothing else happens. i have had this car for 18 months now, and have never had any problems. the car is not used regularly, could it be a voltage problem, if the battery has discharged slightly whilst garaged?

any answers would be gratefully received. slk 230k, 1998......
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#2 Old 05-15-2010
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I'd suggest starting with the simplest thing first. Charge the battery up and clear the codes. Then drive it around and see if any codes come back. If there are, it will be clearer as to what is wrong. Code readers can be had on ebay for about $100. There are different types of readers so if you're not sure, send me a PM and I'll steer you in the right direction.
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#3 Old 05-15-2010
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If that fails, take it get the codes read, cleared. My roof did that after the winter, was just the long lay up.
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#4 Old 05-15-2010
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thanks todd,

i have the battery fully charged now, but the lights are still on as i start the car. been looking around the forums, all seem to be pointing at the brake switch on the foot pedal, or a speed sensor poor connection???? these two faults will disable the abs/asr/cruise control????

not sure how this affects my roof not coming up though???????
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#5 Old 05-15-2010
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Quote:
Originally Posted by steev999 View Post
thanks todd,

i have the battery fully charged now, but the lights are still on as i start the car. been looking around the forums, all seem to be pointing at the brake switch on the foot pedal, or a speed sensor poor connection???? these two faults will disable the abs/asr/cruise control????

not sure how this affects my roof not coming up though???????
As I said, get the codes read and cleared. Most likely due to winter lay up...
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#6 Old 05-16-2010
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thanks for that justin, will do that this week, will let you know
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#7 Old 05-18-2010
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hi all,

i have just tried to have the codes read from the car, but it is coming back as "no codes" i did disconnect the battery for a while last week whilst i took a look at the k40 relay, which looked okay to me.

any other ideas anyone, roof light flashes, but nothing happening at all, and i have the abs and asr warning light, and no cruise control......

help!!!!!!!
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#8 Old 05-19-2010
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Cool Code readers

Quote:
Originally Posted by Todd157k View Post
clear the codes... see if any codes come back... Code readers can be had on ebay...
My understanding is that while Steev's roof problem would likely generate a roof fault code, such codes are only accessible to sophisticated and expensive kit such as the official MB "Star" computer system, rather than the usual OBD2 code readers available on Ebay etc that, I understand, can only read engine fault codes.
Do you reckon, Todd, that there are inexpensive OBD2 readers that can show up roof fault codes as well as engine fault codes?
Incidentally, we know how engine faults bring up a CEL (check engine light)- do roof faults bring up any similar sort of visual warning?
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#9 Old 05-19-2010
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I can't seem to PM you because I'm a noob, what code readers do you recommend?
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#10 Old 05-20-2010
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hi all,

i have read around other forums that a roof and window resync may be required after a battery removal? anyone know of this procedure please?

as the roof would not go up electrically, i put it up manually. do i need to return the roof back to the boot before i try a resync, or can it resync from the roof up position?

the windows are working fine, they come up with the roof switch, and the hydraulic motor still seals as per the last part of the opening/closing procedure of the boot lid?

any help folks would be appreciated!!!

thanks in advance

steev
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#11 Old 05-21-2010
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Don't think there should be any need for a roof synchro procedure after having the battery disconnected- I have often had the battery out, and there was never any need to re-set up the roof operating system after doing so.
The roof should work normally regardless of whether you previously raised it automatically or otherwise.
As just the roof panel is not funtioning, the fault is probably that one of the sensors/micro-switches is not closing, without which the control module will not let the hydraulic roof raising rams operate.
Consider checking the relevant switches.... do a search under vario roof if you don't know where they are.
Best of luck!

Last edited by dog1940; 05-21-2010 at 08:21 PM.
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#12 Old 05-21-2010
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ok, seems there's more interest in the scanners. Here's what I know, hopefully it helps those looking into them.
There are 5 main types of protocol. I suggest getting one with all 5 types so it's good for almost any car built after 1996.
SAE J1850 PWM
SAE J1850 VPW
ISO 9141-2
ISO 14230 (KWP2000)
ISO 15765-4 CANBUS

I also suggest the handheld units vs. the computer readout ones. That way you can keep it with you w/o having to drag the laptop. I do my own tuning on my vette and for that car, I do have a dedicated laptop that travels with me. But that is for tuning and data logging, not just reading codes and clearing them.

Now for the roof "codes". The only thing I found for "Mercedes only" codes are below. These codes are open inputs to the system that each manufacturer can utilize any way they want. That's the reason you'd need a "Mercedes Reader" that is dealer only. These inputs can be from the micro switches or from pressure sensors. I am not an expert on the Merc system. I do know typical systems and how/why they report codes. I don't see anything that eludes to specific roof failures.

Mercedes Specific Codes:

P1105 Atmospheric Pressure Sensor In Control Module

P1220 Fuel Quantity Actuator (Y23/1)

P1221 CAN Communication, ETC Or ETS Interrupted

P1222 IFI Accelerator Pedal Position Sensor (R25/2)

P1223 Fuel Rack Position Sensor (Y23/1/1)

P1335 CKP Sensor (IFI)

P1350 Injection Sensor Solenoid

P1351 Injection Sensor Circuit

P1352 Needle Lift Sensor

P1401 EGR Lifting Sender (B28/3)

P1404 EGR Control

P1465 EPW Power

P1470 Pressure Control Flap Vacuum Transducer (Y31/2)

P1475 Resonance Intake Line Switchover Valve (Y22/7)

P1476 Resonance Intake Manifold Switchover Valve (Y22/6)

P1480 Preglow Control

P1481 Glow Plug Failure

P1482 Preglow Control Module (N14/2)

P1520 Cruise Control Switch (S40)

P1610 Voltage Supply Missing Or Relay Module (K40)

P1611 IFI Control Module (N3/7)

P1612 IFI Control Module (N3/7) Voltage, Circuit 15

P1613 IFI Control Module (N3/7)

P1614 IFI Control Module (N3/7) Voltage Or Fuel Metering Actuator (Y23/1K1) Or Fuel Rack Postion Sensor (Y23/1/1)

P1615 IFI Control Module (N3/7) Supply Voltage

P1617 Control Module Fault Or Control Module Not Coded

P1622 Electrohydraulic Shut-Off Actuator (Y1/1)

P1625 Check Engine MIL

P1630 Drive Authorization Signal

P1705 Starter Lock-Out/Backup Lamp Switch (S16/1)

P1780 Modulation Pressure Switchover Valve (AT/CC) (Y3/4) Or Upshift Delay Switchover Valve (AT/CC) (Y3/5)

P1781 Upshift Delay Switchover Valve (AT/CC) (Y3/5)
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#13 Old 05-21-2010
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Disconnecting the battery clears codes- at least it does in other cars I've had. Could also be as pointed out here, you need a more sophisticated reader. My guess is still there is little wrong, just the winter lay up. I'd find a recommended MB specialist. I've got a great one- but I'm in Glasgow. Try Benzworld forum for someone who is recommended.
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#14 Old 05-21-2010
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Steev- re roof sensors, or more correctly micro-switches, you may have found this already, but in case not......

vario roof sensors diagram.jpg
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#15 Old 05-22-2010
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Steev

Your SLK needs to go on star diagnostics really to see whats going on, if your anywhere near haddenham Cambs UK I can plug it in for you and see whats up.

Free !!

jib
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#16 Old 05-22-2010
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thanks all for the helpful replies, jib, would you believe i bought the car from cambridge, but i live in east yorks, but thanks for the offer.....

i have mercedes benz of york coming to do a complimentary home health check
(everyone aware of this?) on the car on monday. i have had one of these before, and they do indeed bring their diagnostic system with them, and go through the whole car, so hopefully he can locate the problem, as justin says, i believe that it is minor, a switch sudenly sticking etc, and then clear the codes.

i will report back on monday

thanks again all,
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#17 Old 05-22-2010
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another question folks, as i want to go out for a drive tomorrow, i had manually raised the roof last weekend, is it possible to manually lower the roof too, or is the raising procedure just for emergency closure?

does anyone have the procedure for manually lowering if its possible? (is it just a reversal of raising?)it only shows raising in the handbook i believe???
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#18 Old 05-24-2010
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hi all,

just had mercedes down for the free health check, used star diagnostic system, which indeed threw up a fault with the ASR, and the vaio roof. fault indicated problems with the left and right front wheel speed sensors. the technician thought that this was unusual having a fault on both sides. he could do no more than book the car in for further investigation at the dealership this coming friday. the computer would not clear the faults.

at least all the faults are all linked, the roof will not open as the computer does not know the speed of the car, according to the techie, which sounds right to me..

if this is the case, are the wheel speed sensors something that can be done yourself, or is it best left to the experts?

thanks again....
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#19 Old 05-24-2010
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Since The ASR and ABS lights have come on, have you tried turning the wheel full left and then full right? I changed my battery about a month ago, got a few warning lights when I first restarted, which went away as soon as I pulled out of my garage space (which requires a full left wheel turn followed by a full right wheel turn, what luck that is what to do to reset the lights, as I had no idea a reset procdure was required!)

http://www.benzworld.org/forums/r170...t-bas-esp.html
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#20 Old 05-24-2010
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hi santamonica, yes i read about the full left and right locks, did all that, no difference!!!!

just rang an independant mercedes specialist, quoted price of Ł197.50 to replace both front wheel sensors, including VAT!!!!

that sounds like a good deal, so ive booked the slk in for friday morning......

you guys think its a good price?
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