SL/R230: 2003 r230 sl500 with electrical gremlins
#1
Junior Member
Thread Starter
2003 r230 sl500 with electrical gremlins
happy fathers day!
my wife's 2003 r230 w/ 70k miles, is having electrical issues. the coolant level and washer fluid level warning lights are constantly on. the red battery light is always on and the convenience offline is on for approximately 10 minutes then goes out. the interesting thing w/ the convenience offline light is that if i turn the car off after the light goes out and restart the car, it takes another 10 minutes for the convenience offline light to go out. anyone have this happen and/or recommendations? thank you
my wife's 2003 r230 w/ 70k miles, is having electrical issues. the coolant level and washer fluid level warning lights are constantly on. the red battery light is always on and the convenience offline is on for approximately 10 minutes then goes out. the interesting thing w/ the convenience offline light is that if i turn the car off after the light goes out and restart the car, it takes another 10 minutes for the convenience offline light to go out. anyone have this happen and/or recommendations? thank you
#2
Banned
The red light can indicate a faulty alternator or, according to M-B, a particular stored diagnostic trouble code.
Did you check the level of the washer and coolant reservoirs?
#3
Member
Do you have a trickle charger on your Convenience Battery? I had a load of seemingly unrelated warnings when my convenience battery became very worn. When I fixed that I had a total of 54 stored fault codes and a permanently on battery warning light.
Now that the battery is back to normal and codes cleared down, not a single one has reoccurred and the red light has gone.
Now that the battery is back to normal and codes cleared down, not a single one has reoccurred and the red light has gone.
#4
Junior Member
Thread Starter
my ctek died 2 yrs ago and i didnt replace it until recently, but i've put a trickle charger on it for the last 2 months or so getting it back to charge. when i charge it, i still have the same symptoms, i have topped off the coolant and washer fluid. did you have to clear the codes w/ STAR? i have a std obd11 and it doesn't show any codes.
#5
Member
my ctek died 2 yrs ago and i didnt replace it until recently, but i've put a trickle charger on it for the last 2 months or so getting it back to charge. when i charge it, i still have the same symptoms, i have topped off the coolant and washer fluid. did you have to clear the codes w/ STAR? i have a std obd11 and it doesn't show any codes.
#6
Banned
I'd check both switches. First verify that each is plugged in. Next measure the resistance across each switch. You should read 5 ohms or less.
You don't need a wiring diagram, but if interested you can download them here and locate drawing 54.21-U-2122KA to see the circuit with the level sensors.
You don't need a wiring diagram, but if interested you can download them here and locate drawing 54.21-U-2122KA to see the circuit with the level sensors.
Last edited by bobterry99; 06-22-2020 at 04:09 PM.
#7
Junior Member
Thread Starter
what about the convenience battery situation? taking 10 minutes to be able to use those functions (ie top, heated seats etc) each time the car is started.
which foxwell model would work?
which foxwell model would work?
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#8
Member
If your Convenience battery is fully charged you shouldn't be getting the reduced function for 10 mins. If however its run down you will, and even if you run the car and it restores, the moment you switch off it might do it again. Mine did exactly the same until I got the Convenience battery restored. It took over a week on a low power trickle charger to get there.
#9
Junior Member
Thread Starter
the convenience battery is showing 12.6 after i turn off the car and its still taking 10 min for the convenience offline to go away, is this due to stored codes that need to be cleared?
the voltage at the convenience battery w/ the engine at idle is approx 14v.
the voltage at the convenience battery w/ the engine at idle is approx 14v.
#11
Banned
No.
Just before the next time you start the engine, measure the voltage across the battery cables of the trunk battery. If it is below a threshold (refer to my 1st post), then your battery is suspect, or you have a current drain; if above, then your battery control module is suspect and should be checked with Star Diagnosis or similar.
Just before the next time you start the engine, measure the voltage across the battery cables of the trunk battery. If it is below a threshold (refer to my 1st post), then your battery is suspect, or you have a current drain; if above, then your battery control module is suspect and should be checked with Star Diagnosis or similar.
#13
Junior Member
Thread Starter
i have a norco tender connected so the voltage is always around 12.6.
can a foxwell nt510 tell me the issues or do i have to use STAR?
thanks for you help
can a foxwell nt510 tell me the issues or do i have to use STAR?
thanks for you help
#14
Banned
So, if this is the voltage on the rear battery cables when you insert the key with no battery tender connected, then it seems to me the battery control module is falsely reading a lower voltage and erroneously taking consumers offline. A NT610 could certainly communicate with the battery control module and report the voltage it reads.