The time control unit was not fitted to the UK Silvia. Both door switches connect together with a crimped insulated joint under the carpet behind the driver's seat and then head towards the front and the big connector that they call the Super Multiple Junction. If there has ever been dampness in the floor of the car the connection behind the drivers seat can corrode and both switches may stop working. The colour code for the wires is black with a red trace but there are more than one of the same colour. You will have to remove the lower front seatbelt anchorage point to lift the carpet and it may be easier to find it if you remove the driver's seat too.
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