Correct answer
The fuses.
The fuse for the relevant circuit, identified in the vehicle manual. A blown fuse interrupts the circuit to protect against overcurrent; it does not by itself establish the fault’s cause. If replacement is appropriate, follow the manual and use the specified type and current rating, with a suitable voltage rating. Do not fit a higher-current fuse or bridge it with wire. If it blows again, find and correct the cause rather than repeatedly replacing it. Other faults can involve the supply, connections, switches or the accessory itself.
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The fuses.
Whether current is reaching it.
The battery.
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