Body, generic

B0320 Passenger Seat Position Sensor Circuit

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

None of the J2012 lists on hand names B0320, and no vehicle maker publishes a definition. The title concerns position feedback on a powered front passenger seat, which exists mainly where that seat has memory or an easy-entry function. Saab's 9-3 passenger seat module uses B2375 for its fore-aft sensor: 01 when the input exceeds 7 ± 0.2 V, 04 for an open line; either way memory functions stop and calibrated end stops are lost. US6320341B1 avoids a separate sensor by counting the current ripple of the DC motor, while US5751129A builds the sensors into the memory module. The driver-side counterpart is B0310; fore-aft motor faults on this seat are B0570.

Likely causes

Position sensor in the passenger seat motor failed

Seat loom damaged by objects or feet under the seat

Sensor signal shorted to supply voltage

Passenger seat module input faulty

Symptoms

Passenger seat memory or easy-entry does not work
Seat jerks when starting or stopping

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–500

Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

seat position sensorseat control moduleseat harness

Related codes

B0310 B0327 B0570

References: saabwisonline.com, saabwisonline.com, patents.google.com, patents.google.com.