B1B1E

Code

Generic B — Body

Seat Belt Pretensioner Circuit Short to Ground (Passenger Side)

Brand: Generic

Type: B — Body

Views: UK: 12 EN: 17 RU: 19

AI status

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Page language: EN

Causes

Damaged or chafed wiring harness under the passenger seat making contact with the vehicle chassis
Corroded, bent or pushed-out connector pins at the pretensioner connector
Water or debris intrusion into the seat connector or wiring
Failed pretensioner (squib) with internal short
Faulty ground at the SRS control module or poor chassis ground connection
Aftermarket seat or repair work that disturbed the harness or connectors

Symptoms

SRS / airbag warning light illuminated on the instrument cluster
Possible passenger airbag or seatbelt warning indicator illuminated
Diagnostic trouble code B1B1E (and possibly related airbag codes) stored in SRS module
Passenger pretensioner may be disabled — risk that it will not deploy in a crash
No obvious mechanical fault with seatbelt retractor (unless wiring damage present)

What to check

Use a scan tool to read all stored SRS codes and freeze-frame data; note related codes and events
Visually inspect passenger seat area, seat rails and underside for chafed wiring, connector damage and signs of water
Inspect pretensioner connector for corrosion, bent pins, pushed-out pins or foreign material
Check SRS-related fuses and module grounds for security and corrosion
With ignition OFF and SRS system disabled per OEM procedure, measure pretensioner resistance at the connector
Check for short to ground between the pretensioner signal pin and chassis ground with the connector disconnected

Signal parameters

Pretensioner resistance (squib) typical: approximately 0.5–3 Ω (varies by manufacturer) — consult OEM spec
Open circuit: very high or infinite resistance (indicates open)
Short to ground: measured near 0 Ω between signal and chassis ground when connector is connected
Connector pin voltage with ignition ON (SRS powered): normally near battery voltage only when driven — reading near 0 V at the pin can indicate a short to ground
Connector pin-to-chassis ground resistance (with connector unplugged): should be high (kΩ or more); low resistance indicates a short to ground

Diagnostic algorithm

Safety first: follow the vehicle manufacturer’s SRS service precautions. Disable the SRS system by disconnecting the battery and observe the OEM recommended wait time before touching connectors (commonly several minutes).
Use a professional scan tool to confirm B1B1E and note any additional airbag codes or freeze-frame data.
Visually inspect the passenger seat, seat rails and underside for obvious damage to the pretensioner wiring and connector. Look for chafing, pinched sections or water intrusion.
Disconnect the pretensioner connector (with SRS disabled). Measure resistance across the pretensioner terminals using a low-ohm meter. Compare to OEM spec; resistance near 0 Ω may indicate an internal short, very high/infinite suggests an open.
With connector disconnected, check resistance between each pretensioner pin and chassis ground. A low resistance indicates wiring short to ground.
If short to ground is found in the harness, trace wiring toward the SRS module, removing seat trim as needed. Pay attention to seat rail pivot points and seat heater elements which can damage wiring.
Repair or replace damaged wiring/harness sections and connectors. If wiring and connectors test good but pretensioner resistance is out of spec, replace the pretensioner assembly.
After repairs, reconnect everything, reconnect battery per OEM procedures, clear codes with a scan tool, then perform a verified system test and road test if recommended. Re-scan to confirm code does not return.
If wiring and pretensioner check good but code persists, verify SRS control module grounds and power supply; consider module testing or replacement as a last resort following manufacturer guidance.

Likely causes

Wiring damaged at seat rail where harness bends during seat travel
Corroded or loose connector at pretensioner plug
Internal short in the pretensioner squib
Short to ground caused by water ingress into connector
Poor chassis or module ground

Fault status

⚠️ Status

Passenger seat belt pretensioner circuit short to ground detected. SRS/airbag warning lamp may be illuminated and passenger pretensioner may be disabled until fault is corrected. Inspect wiring, connector, pretensioner device and grounds.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours