9-3 Convertible (9400) L4-2.0L Turbo (B205) (2000)
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The motors are controlled by the switches in the switch unit and are monitored by the PSM. When the motors are running, the control module detects the
pulses from the Hall sensors, which are used for programming. To change the direction of rotation of the motors, the polarity of the motor is reversed.
Diagnostics
The following motors can be controlled from the switch unit:
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Electric motor (357Da) moves the seat forward or back
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Electric motor (357Db) raises or lowers the seat front
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Electric motor (357Dc) raises or lowers the seat rear
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Electric motor (357Dd) changes the backrest angle.
If the relevant motor will not operate either manually or via a memory setting, one or more of the following DTCs will be generated (short to ground):
B2142 Motor, legroom adjustment
B2142 Motor, backrest
B2152 Motor, rear seat edge
B2157 Motor, front seat edge
