B1665

Code

Other B — Body

Seat Driver Forward/Backward Motor Stalled

Brand: Other

Type: B — Body

Views: UK: 26 EN: 52 RU: 28

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Motor failure (internal fault or worn brushes)
Mechanical obstruction or binding in seat tracks/gears
Broken or stripped gear/drive mechanism
Poor electrical connection or corroded connector at the motor
Open or shorted wiring to motor (power or ground)
Blown fuse or faulty relay in seat circuit

Symptoms

Seat will not move forward or backward when commanded
No motor noise when operating the switch, or just a clicking relay sound
Grinding, scraping, or unusually loud noise from seat area
Intermittent movement or movement only in one direction
Blown fuse when attempting to operate seat
Burning smell or smoke in severe electrical fault cases

What to check

Visually inspect seat tracks and under-seat area for foreign objects, debris, or bent components
Operate seat while listening for motor noise and observing motion; note direction(s) that fail
Check related fuses and relays for continuity and correct seating
Inspect motor connector for corrosion, bent pins, or water ingress; wiggle while operating switch to check intermittency
Scan vehicle and read live data/commands for seat motor and position sensor (if available)
Measure voltage at motor connector while commanding seat movement (battery voltage should be present)

Signal parameters

Motor supply voltage: ~battery voltage (≈12 V) present at motor connector when commanded
Motor resistance: typically low (a few ohms); consult vehicle spec for exact Ohms
Stall current: higher than running current; running current commonly single-digit to low double-digit amps, stall current can be much higher—watch for fuse/relay rating
Position feedback (if present): potentiometer/encoder output varies with seat position (typical analogue range 0.5–4.5 V)
Control signal: module/switch should provide a voltage or ground command to motor—use scan tool to view command status

Diagnostic algorithm

Obtain freeze frame/live data and note any additional related codes; do not assume a single-cause without verification
Attempt to reproduce the fault; observe whether the motor makes noise or is completely silent when commanded
Visually inspect seat tracks, remove obvious obstructions, check for bent sliders or missing fasteners; free any binding and retest
Check fuses and relays for the seat circuit and replace if faulty
With ignition on and command active, measure voltage at the motor power and ground terminals. If no command voltage, trace back to switch/module
If command voltage is present but motor does not run, disconnect motor connector and check motor resistance/continuity. Bench-test motor directly to battery briefly to verify operation (secure motor before testing)
If motor runs on bench but not in vehicle, inspect wiring for an open, short, or poor ground; repair broken wires or corroded connectors
If motor does not run on bench or draws excessive current, replace motor/gear assembly
Inspect and test seat position sensor (potentiometer/encoder) and control switch if movement stops due to erroneous feedback
After repairs, reassemble, clear codes, and verify full function through multiple cycles and a road test if applicable

Likely causes

Motor jammed by foreign object in track
Motor windings worn or brushes failed
Connector corrosion or pin pushed out at motor plug
Seat track bolt or bent slider causing binding
Faulty seat switch or intermittent wiring at switch
Fuse/relay failed or intermittent contact

Fault status

⚠️ Status

B1665 — Driver seat forward/back motor stalled: command present but motor is not turning or travel is obstructed; diagnostic required to isolate motor, mechanical, or wiring fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours