9-3 SE Convertible (9400) L4-2.0L Turbo (B205) HO (2001)
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The control module detects the voltage change between 7 V when the north pole passes and 5 V when the south pole passes.
The control module counts the pulses and therefore knows how long the motor must run for the seat to assume the desired position.
Diagnostics
If an open circuit/short circuit to B+ or ground should occur in the Hall sensor circuit, a diagnostic trouble code will be generated. The motor concerned,
except for the backrest motor, can be operated for 500 ms.
One or more of the following DTCs are generated:
B2101 Motor, legroom adjustment
B2106 Motor, front seat edge
B2111 Motor, rear seat edge
B2116 Motor, backrest
