B1650

Seat Driver Recline Forward Circuit Short To Ground

Body Chassis/Safety Seat Control Circuit 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The driver's seat recline motor circuit has a short to ground, meaning electricity is taking an unintended path to ground instead of flowing through the motor properly. It's like a water hose with a hole in it—the water leaks out before reaching its destination.

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Symptoms You May Notice

3 known symptoms for this code
Driver seat recline control does not respond or moves erratically
Seat recline button clicks but seat does not move
Potential electrical burning smell near seat base
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the voltage and current flowing through the driver seat recline motor circuit. It expects specific resistance and voltage levels when the recline switch is activated. A short to ground causes abnormally high current draw or zero resistance, triggering the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Circuit Resistance 50-500 ohms (motor load dependent) <10 ohms or open circuit (short to ground detected)
Supply Voltage 10-14.5V at motor connector 0V or rapidly fluctuating voltage
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness connector at seat base
Disconnect and inspect connector pins for corrosion, moisture, or loose terminals; clean with contact cleaner and reseat firmly.
2
Recline motor wiring for abrasion damage
Visually trace wiring under and around seat frame for cuts, pinches, or worn insulation; wrap any damaged areas with electrical tape temporarily.
3
Driver seat recline motor assembly
If wiring is intact, replace the motor as internal short is likely; requires seat removal and connector unplugging.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1650 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B1650

What happens after you fix the fault

Once the fault is repaired, B1650 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.