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B1340
System
Supplemental Restraint (Airbag)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Driver Seat Track Position Sensor Circuit

Understand B1340, common causes, and the right TOPDON scanner to diagnose it.

Driver seat position sensor tells SRS how far seat is adjusted.

Common symptoms

  • Airbag warning
  • Deployment strategy compromised

Typical causes

  • Failed track sensor
  • Wiring in seat rail
  • Seat disassembly damage

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

What does B1340 mean?
B1340 indicates driver seat track position sensor circuit. Driver seat position sensor tells SRS how far seat is adjusted.
Can I diagnose B1340 with a basic code reader?
B1340 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for B1340?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B1340?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.