B1325
System
Body (Doors)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Driver Door Ajar Circuit

Understand B1325, common causes, and the right TOPDON scanner to diagnose it.

BCM thinks driver door is open when latched — door jamb switch or wiring fault.

Common symptoms

  • Dome light stays on
  • Alarm issues
  • Battery drain

Typical causes

  • Failed door ajar switch
  • Wiring in door harness
  • Misaligned striker

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

Can I diagnose B1325 with a basic code reader?
B1325 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with B1325?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.