Reading Current Flow Diagrams
 

Anyone point me to a primer on reading/understanding the current flow diagrams in my Workshop Manuals? Pretty thin on legends & keys... I know I've seen something but I can't find it.

Specifically, trying to understand the control circuit for the rear blower circuit. I have a continuous run problem. Stone cold or hot - doesn't matter. Only way to turn it off is to remove the fuse. As far as I can tell, it appears to be controlled by a relay, a resistor, and a temp control from the CCU??

Thanks.

Steve

Steve,

The Bosch <b><i>Automotive Handbook</b></i> that Pelican sells has a pretty good section on DIN electrical symbols and diagrams.

The overall form of the current flow diagrams is what is called 'detached drawing' in American industry. Nothing assembled together in groups, such as connectors, is drawn together, and that part is pretty much nonsense, and probably the most exasperating aspect!!!

If you have the automatic heater control like I have in my 82 SC Bentleys has a trouble shooting chart. If there is a open circuit in the cabin sensor wire the motor will run all of the time(if my memory is right. The connector may be making a bad connection on the back of the sensor. Just guessing.