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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.
Some models use a low speed fan relay and this relay can burn out and cause this fault here.I have also seen where the engine computer can fail internally and not send a signal to turn on the low speed fan relay.These are the two main causes for this issue here.
The computer and relay will need tested to see if one of these is the cause here needing replaced and then the affected component replaced.Unfortunately I do not have a diagram of the locations of the relays and computer or testing info on this myself and I apologize for this.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.
It can be a relay in the resistor assembly or another electronic resetting in the resistor assembly when you unplug the battery that is allowing operation of low speed.If this fan has an actual fan control ecu or resistor assembly this would be the most common in most cases to cause this issue here needing replaced.
Let me know if you need anything else and feel free to rate my help here as this is how I receive credit for my time.