Hi k12virgin
Have you checked your windscreen wiper fuse should be a 20A number 38 should be in the engine bay. Im assuming its your front wipers as you said wipers . Usually if these dont work its either the motor or the linkage is seized. If its the linkage they usually come to about £30.
Theres no speed sensor, the abs control unit contains the ECU and the micra uses wheel sensors to each wheel to determine the speed.
Its located at the rear of the engine compartment on the passengers side, if you take the plastic cowl trim off you might have better access to it.
To check the wheel sensors you need a digital voltmeter to the disconnected wheel sensor,
On the front wheel it should be near the brake caliper and on the back wheel behind brake drum.
To do this turn ignition on
Check battery voltage at one of the terminals of the supply connector.
Reconnect sensor and backprobe the signal wire.
Spin the wheel check yhe output voltage is between 0.9 and 1.65 volts.
N.B . Any renewal of front wheel sensor will also require new wheel bearing as this contains magnetic ring that induces the sensors output.
The rear pick up ring is a press fit on the rear hub. Do not remove it if necessary.
Hope this helps