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Passenger power seat mystery 900

posted by  spook on  Mon Jul 26 08:35 CST 2010
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last visit: Fri Oct 24 08:06 CST 2014
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Dear Jim Lee,

Hope this find you well. The heavy-duty Black wire is the ground for the seat motors. The Red wire is the positive wire, which supplies power to the seat motors. Those in bundle two are seat control wires. If memory serves, the yellow and green are for the seat belt reminder chime.

I believe there is in the seat-side switch, a relay, at the point where the power supply wires enter the seat-side switch circuit board. If that relay fails, then no power reaches the switches.

The relay is a protective device. Power flows to the seats, even when the key is not in the ignition. As a power spike, e.g., on start-up, could damage the seat computer, the relay acts as a safety device. Normally, it is closed, and power flows through the relay to the seat switch, and thence to the seat computer. If, however, the relay has failed, then the seat switch is "dead".

Hope this helps.

Yours faithfully,

Spook






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