Airbags

B1330 — Left Front Impact Sensor Circuit Fault

Severity: high Drive with care, to a shop

What B1330 means

B1330 means the supplemental restraint system (SRS) control module detected an open, short or abnormal resistance in the left front impact sensor circuit. The sensor is usually mounted on the fender, bumper reinforcement or radiator support and tells the module how hard a frontal impact is. If that signal is lost, the module cannot judge a crash correctly and typically disables part of the system.

Symptoms

  • Airbag/SRS warning light on or flashing
  • Airbag system disabled or running in limited mode
  • Code returns after being cleared
  • Problem appears after front-end collision repair

Possible causes

  1. Failed left front impact sensor
  2. Wiring damaged during collision repair
  3. Loose, corroded or poorly seated sensor connector
  4. Moisture or corrosion in the front harness
  5. Sensor installed incorrectly or mounting bolt loose
  6. Faulty SRS control module (rare)

How to diagnose

  1. Scan for codes with a tool that reads SRS and note any related faults
  2. Inspect the sensor, its mounting and the harness along the fender and radiator support
  3. Find out whether the car had a collision or body repair and whether the sensor was installed correctly
  4. Disconnect the battery per the manufacturer's procedure and inspect the connector for corrosion, bent pins and a secure lock
  5. Test circuit resistance and check for shorts to ground or power using the wiring diagram
  6. Substitute a known good sensor if the service procedure allows, then clear the code
  7. Road test and confirm the code does not return

Common fixes

  • Repair or replace damaged wiring
  • Clean, repin or replace the connector
  • Replace the left front impact sensor
  • Reinstall the sensor securely to the specified torque
  • Replace or reprogram the SRS module if confirmed faulty

B1330 on different brands

Ford · manuals
The notes list B1330:9A for Ford as a 400 W DC/AC inverter inoperative condition stored by the BCM, with a possible connection issue at connector C4628; confirm the code definition for your specific model.

Questions and answers

Is it safe to drive with B1330?

You can drive, but the airbags may not deploy properly in a crash. Don't put off diagnosis.

Why did B1330 appear after bumper or fender repair?

Repairs often pinch the harness, leave a connector unplugged or loose, or mount the impact sensor wrongly. Check those first.

Can I just clear B1330?

You can clear it, but if the fault is still there the code will return and the SRS will not be fully protective.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.