Dear yenna,

May this find you well. According to the 1993 940 wiring diagram, heated seats are on a circuit with a 25-Amp fuse (No. 23). Powered seats are on a circuit with a 30-Amp fuse (No. 3). If you want to power the seats on the circuit used for the seat heaters, you'll need to install a 30-Amp fuse. I'd guess the wire on both circuits is of the same weight, so the additional load is unlikely to be problematic. Be sure to note on the fuse diagram, that this interchange has been done.

There are other wrinkles, though. If you do according to the procedure set forth in the FAQs, the wire, that takes power to a powered seat, runs directly from the fuse block to the seat motor control switches, via the connector at front of the door-side seat rail. As a result, the seats can be moved, without the key being in the ignition.

The wire, that takes power to the seat heaters, is switched. For the seats to work, the seat heater switches and the ignition will have to be in the "on" position. Anyone, who does not know this, will be unable to get the seats to move.

Further, you'll have to move the white wire with black trace from the seat heater connectors (C31 / C32) to the connector C39, which houses the wire, that takes power to the seat motors. This is not hard to do. Be sure to position the white wire with black trace (seat heater) such that it connects to the red wire with black trace, that takes power to the seat motors.

Running wires directly from the fuse block to the each seat keeps things very simple. If the seats don't work, the problem likely is in the seat switch/seat computer. If power flows through the seat heater switches (to which power arrives via a bypass relay on the main fuse block) trouble-shooting is far more difficult.

As you note, the thin orange wire connects to the stop button.

Hope this helps.

Yours faithfully,

Spook