What does it mean?
B1750 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Driver Seat Rear Down Switch Circuit Malfunction .
Symptoms
- Rear of the cushion will not lower, or drops unevenly
- Seat tilt adjustment is lost while slide, recline and front height still work
- Movement stops before the seat reaches the desired position
- Stored seat positions can no longer be recalled correctly
- Code returns shortly after clearing, typically while the seat is being adjusted
Likely causes
- Dirty, worn or intermittent rear-down contact in the switch pack
- Liquid damage inside the switch leaving residue between the contacts
- Rear-down signal wire chafed against the rail or broken where the loom flexes
- Under-seat connector terminal corroded, loose or pushed out of its housing
- Rear height motor binding or drawing abnormal current
- Seat or memory module input stage failure
How to fix it
- Read the codes and monitor the rear-down input live while pressing the rocker
- Inspect and clean the switch pack contacts, looking for spill damage
- Try a known good switch pack if one is available before suspecting wiring
- Measure continuity and resistance of the rear-down wire between switch and module
- Move the seat through its full travel while wiggling the loom and watching for signal loss
- Check the rear height motor current draw and the freedom of the lift linkage
- Repair the wiring or replace the switch, motor or module according to the findings