Thread: ECU Controlled Fans - VA Binary or Trinary Switch
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Old 11-25-2016, 08:49 PM
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Default ECU Controlled Fans - VA Binary or Trinary Switch
I am working through the wiring on my car and wanted to know if anyone had a wiring diagram for relays that are using the E38 ECU to control their fans with a vintage air trinary switch.

From what I have read you have to introduce a 3rd relay for the trinary trigger or the ECU will see it as a fault.

Appreciate the help!
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