Code
B1C3A
MITSUBISHI
B — Body
DR.pretensioner circuit open
Views:
UK: 28
EN: 33
RU: 22
AI status
Completed
Completed
100%
Causes
- Broken or pinched wiring in pretensioner harness
- Disconnected, corroded or damaged pretensioner connector
- Failed pretensioner (open internal winding after deployment or fault)
- Poor/cracked connector pins or terminal backs out
- Previous deployment not properly repaired (pretensioner or wiring not replaced)
- Faulty SRS control module or connector (less common)
Symptoms
- SRS / airbag warning lamp illuminated on instrument cluster
- Driver pretensioner will not activate in a crash (system disabled for that channel)
- Possible stored related SRS trouble codes
- Repair history showing previous deployment of pretensioner
What to check
- Read and record all SRS codes with a capable scan tool; note freeze frame if available
- Visually inspect driver pretensioner connector (under seat or B-pillar) for damage, corrosion or disconnected plug
- Inspect harness routing for chafing, pinches, or repair splice points
- Check for evidence of prior deployment (cut wiring, replaced components, deployed airbag)
- Verify related fuses and ground connections for the SRS system
- Measure continuity/resistance of pretensioner circuit with battery disconnected and SRS capacitors discharged
Signal parameters
- Expected pretensioner resistance: typically low ohms (common range ~0.5–5 Ω for an intact squib) — consult factory spec
- Open-circuit reading: infinite/open (OL) indicates an open/faulty squib or broken wiring
- Continuity: conductor continuity from pretensioner connector to SRS ECU pin should be present
- No supply voltage should be applied to squib during resistance checks; follow manufacturer safety wait times after battery disconnect
Diagnostic algorithm
- Retrieve and record all SRS/airbag codes with a proper scan tool. Note related/secondary codes.
- Follow manufacturer safety procedure: disable SRS system by disconnecting negative battery terminal and wait the recommended time for the SRS capacitor to discharge (consult service manual).
- Visually inspect driver pretensioner connector, pins and harness for obvious damage, corrosion, pushed-out pins or repairs. Check under/around the seat and B‑pillar harness routing.
- With battery disconnected and safe to work, measure squib resistance at the pretensioner connector using a digital multimeter. Compare to factory spec. Infinite/open indicates a failed squib or open circuit.
- Check continuity from the pretensioner connector to the corresponding SRS ECU pin. Repair any open wiring or poor connections found (replace damaged sections, repair terminals).
- If wiring and connectors are good and resistance is open, replace the driver pretensioner assembly per manufacturer procedure.
- After repair or component replacement, clear codes with a scan tool, reconnect battery, and cycle ignition. Re-scan to confirm code does not return and perform SRS self-test if available.
- If code persists after replacing pretensioner and repairing wiring, test/inspect SRS ECU connector and consider ECU fault—refer to manufacturer diagnostics.
Likely causes
- Open/failed pretensioner element (high or infinite resistance)
- Open harness between pretensioner and SRS ECU (broken wire, chafing, connector separation)
- Corroded/pushed-out pin at pretensioner or ECU connector
- Damage in seat/seatbelt area (seat removed, seat recliner harness, B-pillar harness)
Fault status
Status
Driver pretensioner circuit open — SRS lamp on; driver pretensioner function disabled until circuit is repaired and codes cleared.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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