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Brownings Garage LTD


Brownings Garage Ltd, established in 1910 and based in London, is a modern day workshop offering leading industry services, including; service and repairs, MOTs, electronic diagnostics and fault finding, tyre tracking and more!


Director, Miles Brown, is the 3rd generation in his family to have run Brownings Garage. The workshop started initially in repairing motorbike frames before expanding to car repairs in the 1920’s. Now in 2019, knowledgeable of the evolving automotive industry, the business has developed even further to incorporate electric and electric hybrid vehicle services.


Browning’s Garage use their Autologic diagnostic system on a weekly basis to resolve a wide range of coding and programming issues. Their latest issue arose with a Mercedes-Benz C-Class (06 model year), which was experiencing a cooling fan fault.

The fault presented itself with the cooling fan being on permanently, and a coolant warning light displayed on the instrument cluster.

To ensure that he found a solution quickly and efficiently, Miles decided to utilise the AutologicLive service. As a result, Miles was able to contact an OEM-Trained Master Technician for guidance on how to repair the fault.

Miles provided Kevin Hardy, one of Autologic’s Mercedes OEM-Trained Master Technicians, details of the fault and fault codes found (P1636-004 Check engine & air conditioning electric suction fan with integrated control (M4/7): signal wire open circuit).


Kevin, explained that the following 4 wires would need to be checked:

  •     Pin 2 at fan = 10mm red =perm 12v live
  •     Pin 1 = earth
  •     Pin 3 = blk/red = 12v ign live
  •     Pin 4 signal wire to ECU pin 57 plug 2 at engine ECU
Kevin then suggested that Miles load test the signal wire and substitute it, and that in terms of voltage on this particular wire, he should expect to see:
  •     1.0 volt to 1.7 volts to get the fan to be stationary and with no actuation
  •     8.0 volts to 10.5 volts = this will ask the ECU to go to maximum

Miles was then also advised to:

  •    Look at the signal wire out of the engine ECU, and also at the other end of the fan module
  •    See if the engine cannot see continuity on the signal wire (it would log a code for the suction fan)

As a result of following some step by step guidance from Kevin, Miles was able to identify and find the
broken signal wire.

After replacing the wire, the fault was rectified, and Miles was then free to tackle his next job of the day.

The Car and Fault:
Mercedes-Benz C-Class (06 model year) Cooling Fan Fault                   

Master Technician:
Kevin Hardy                                         

Diagnosis and Fix Time:
35 minutes                      

Thanks to Kevin’s help, I found the signal wire broken as suspected, behind the N/S/F inner wheel arch just by the washer bottle. Using AutologicLive saved me valuable time on this job!

- Miles Browning Director Brownings Garage Ltd