2011 Citroën C4 Picasso

This vehicle came in for heater blower issues and the customer complaining of hearing water swilling around at corners.

We gained access to the motor and control module and found both had suffered water damage

Now we could of just fitted new parts and give it back to the customer. But we perform more checks to confirm the switching side of the circuit is OK. For this we have to use a scope to read the signals from the switches on the control panel. Below you can see a video of the signals as they change as the switch for the different speeds is moved

Also we wanted to find the source of the water to stop it happening again. On stripping out the wipermotor to gain access to the bulkhead there is a big gully behind which when emptied had a considerable amount of water in it. The drain holes were cleaned out to prevent any further problems.