M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Front wipers malfunction.

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Old Dec 18, 2023 | 07:15 AM
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Karsaado's Avatar
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W164
Front wipers malfunction.

Hello everyone

I'm having a problem with the front wipers.
The car is stationary, when I activate the wipers, they work without problem, but as soon as I start the car, the wipers remain blocked.
I take the car to the case, and here are the fault codes that come up:


902A :the component or the cable of the component f58kb (wiper relay on/off)has short-circuit to ground
902B :component or cable of component f58kb (wiper relay on/off)short-circuited to plus
902D:component or cable for component f58ka (wiper speed relay 1/2) short-circuited to ground
903O :component or cable for component f58kf (horn relay) short-circuited to ground

I changed the 2 relays

A Wiper speed relay 1/2
B Wipers ON/STOP

But no change

Can you please help me? Is there a link with the rear Sam? I don't have any fault to identify on the rear Sam.
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Old Dec 18, 2023 | 08:30 AM
  #2  
Joshinator99's Avatar
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ML 63 AMG
Originally Posted by Karsaado;[url=tel:8894017
8894017[/url]]Hello everyone

I'm having a problem with the front wipers.
The car is stationary, when I activate the wipers, they work without problem, but as soon as I start the car, the wipers remain blocked.
I take the car to the case, and here are the fault codes that come up:


902A :the component or the cable of the component f58kb (wiper relay on/off)has short-circuit to ground
902B :component or cable of component f58kb (wiper relay on/off)short-circuited to plus
902D:component or cable for component f58ka (wiper speed relay 1/2) short-circuited to ground
903O :component or cable for component f58kf (horn relay) short-circuited to ground

I changed the 2 relays

A Wiper speed relay 1/2
B Wipers ON/STOP

But no change

Can you please help me? Is there a link with the rear Sam? I don't have any fault to identify on the rear Sam.
Sounds like the wiring may have a break in it…? I would follow the wiring to & from those relays carefully and look for any cracks in the wiring.
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