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Mercedes A w169 with fault M4 / 7. Cool fan continuously at…

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Mercedes A w169 with...

Mercedes A w169 with fault M4 / 7. Cool fan continuously at high speed when motor runs.
If engine is off and ignition off. Motor runs at interval half speed.Wiring cooling fan: thick wire 12 V measured. mass is good.
contact on: (red / green) = 12 V
Cable ECU (blue brown yellow) is 0.5 VWhat is not good?

Mechanic's Assistant: Have you checked all the fuses? Do you have a wiring diagram?

Hecked all cables. Are there 4 cables.
No wiring diagram

Mechanic's Assistant: What year is your M4?

2005

Mechanic's Assistant: Are you fixing your M4 yourself? What have you tried so far?

Nothing

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Have replaced the ignition coil of cylinder 1

Submitted: 7 months ago.Category: Mercedes
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Answered in 13 minutes by:
1/6/2018
Mercedes Mechanic: Wolfgang, Mercedes Technician replied 7 months ago
Wolfgang
Wolfgang, Mercedes Technician
Category: Mercedes
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Experience: master tech benz ase cerified L1 and L2
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Welcome, I'm Wolfgang.

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was a scan test performed? what faults are stored in all modules?

I do need a vin # please

thanks

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