What does it mean?
B1735 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Driver Seat Front Up Switch Circuit Malfunction .
Symptoms
- Front of the seat cushion will not lift, or rises erratically
- Other seat directions still function normally
- Seat sometimes moves briefly and then stops as if the switch had been released
- Memory recall does not complete because the front height axis never reaches its target
- Warning message or seat adjustment lockout on some vehicles
Likely causes
- Worn, dirty or burnt contact inside the switch pack on the front height rocker
- Liquid spill drying inside the switch and leaving conductive residue
- Broken or chafed front-up signal wire where the loom follows the seat rail
- Loose, corroded or backed-out terminal in the under-seat connector
- Front height motor drawing excessive current and pulling the control circuit out of range
- Seat or memory module input stage failure
How to fix it
- Read the codes and monitor the front-up switch input live while operating the rocker
- Remove the switch pack and inspect the contacts, cleaning any residue found
- Try a known good switch pack if one is available to prove or clear the switch
- Measure continuity and resistance of the front-up wire from the switch connector to the module
- Wiggle the loom along the rail and under the cushion while watching for the signal to drop out
- Check the current draw of the front height motor; a stiff or seized motor can disturb the circuit
- Repair the wiring or replace switch, motor or seat module according to the results