B1765

Code

Other B — Body

Seat Driver Forward Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 26 EN: 48 RU: 31

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Verify fuse(s) and seat circuit relay(s) are intact and proper rating
Attempt seat forward movement while listening for motor/relay operation
Operate seat in other directions to confirm motor and wiring are otherwise functional
Scan for additional seat or body control module codes
Visually inspect harness and connectors under the seat and at the module for damage/corrosion
Check for mechanical obstruction in seat tracks

Battery voltage (~11–14 V) present at motor feed pin when module commands 'forward' (may be PWM depending on vehicle)
Motor return/ground should be near 0 V when commanded (if driven actively to ground)
Motor winding resistance typically low (often 1–10 ohms) — compare to known good spec for vehicle
Open-circuit = infinite/OL on continuity test between motor pins and module
Short to ground = near 0 ohms between feed and chassis ground when not commanded (indicates short)

Retrieve freeze frame and all related DTCs; record conditions when B1765 set.
Check fuses and relays for the seat circuit; replace if blown and note if it re-blows.
With key on, command seat forward while an assistant listens at the seat: note sounds, movement, and if fuse/CB reacts.
Inspect wiring and connectors under the seat, at the motor, and at the seat control module for damage, corrosion, or loose pins. Wiggle harness while commanding forward to check for intermittent faults.
Measure voltage at the motor connector while commanding forward. If no command voltage, trace back to switch/module. If command voltage present but motor does not run, suspect motor or wiring to ground.
Check motor winding resistance and compare to spec. Open or very high resistance indicates motor failure. Very low/near zero may indicate shorted windings.
Test continuity between motor and control module connector; check for short to ground or battery. Repair any harness faults found.
Test the seat control switch for correct operation (continuity or signal output) per vehicle procedures. Replace switch assembly if faulty.
If wiring, switch, and motor check good, perform module outputs test or replace/repair seat control module / BCM as directed by manufacturer diagnostics.
After repair, clear DTCs and verify operation through full range of motion and multiple key cycles. Confirm no return of the code.