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B1347
System
Supplemental Restraint (Airbag)
Scanner som krävs
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Ignition Voltage Low — Restraints System

Understand B1347, common causes, and the right TOPDON scanner to diagnose it.

SRS module detected low ignition supply voltage during operation.

Vanliga symptom

  • Airbag light on after start
  • Multiple U-codes possible

Typiska orsaker

  • Weak 12V battery
  • Corroded battery terminals
  • Low voltage during crank

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

What does B1347 mean?
B1347 indicates ignition voltage low — restraints system. SRS module detected low ignition supply voltage during operation.
Can I diagnose B1347 with a basic code reader?
B1347 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 B1347?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B1347?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.