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Home / DTC / B1B10 — DR.knee bolster squib low

B1B10 — DR.knee bolster squib low

Detailed page for trouble code B1B10.

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Code

B1B10

MITSUBISHI B — Body

DR.knee bolster squib low

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground in the driver's knee squib wiring
  • Damaged or corroded connector/pins at squib or airbag ECU
  • Pinched/chewed or chafed wiring (insulation worn through)
  • Faulty squib (internal short)
  • Faulty airbag ECU / driver circuit transistor
  • Poor battery/ground supply or intermittent supply drop during system test

Symptoms

  • SRS/Airbag warning lamp ON
  • Possible disablement of knee airbag (system will inhibit deployment until repaired)
  • Stored or recurring B1B10 code
  • Vehicle may fail safety inspection
  • No other drivability symptoms (engine runs normally)

What to check

  • Use an OEM-compatible scan tool to read/record all SRS codes and freeze frame data.
  • Follow SRS safety procedure: disable battery (disconnect negative) and wait manufacturer-specified time before touching connectors (commonly 90 seconds or per service manual).
  • Visually inspect wiring harness and connectors for damage, corrosion, bent pins, or evidence of previous work in area under dash/knee bolster.
  • Inspect and secure ground points and battery terminals; check for low battery voltage events.
  • Check connector pin condition at knee airbag and at SRS ECU (with battery disconnected).
  • Measure continuity and resistance of knee squib circuit using insulated test leads and an ohmmeter (with battery disconnected).

Signal parameters

  • Typical intact airbag squib coil resistance: low single-digit ohms (commonly ~1.0–5.0 Ω depending on vehicle).
  • Reading near 0 Ω indicates a short to ground; very high or infinite resistance indicates an open circuit.
  • No continuous deploy/firing voltage should be present at squib in normal quiescent state — ECU only applies firing current during deployment. Use scan tool diagnostics rather than applying voltage.
  • SRS ECU monitors circuit voltage/impedance and flags low-voltage condition when measured values fall below manufacturer thresholds.

Diagnostic algorithm

  1. SAFETY FIRST: Read service manual SRS safety instructions. Disconnect negative battery terminal and wait the specified time before working on SRS circuits.
  2. Read and record all airbag/SRS codes and freeze-frame data with a capable scan tool. Note any other related codes or network errors.
  3. Visually inspect the knee airbag connector, harness from knee module back toward ECU, and any intermediate connectors for damage, corrosion, or intrusion. Repair obvious damage.
  4. With battery disconnected, measure squib resistance at the knee airbag connector (disconnect the module). Compare to expected range (low single-digit ohms). A near-zero reading suggests a short; very high/OL suggests open circuit.
  5. If resistance is low (possible short), isolate sections of the harness: disconnect connectors in-line and measure each segment to locate the short to ground. Repair damaged wire or connector.
  6. If squib resistance at module is normal but ECU side shows low reading, inspect/replace the intermediate wiring or connector(s). Check ECU connector pins for shorts to ground.
  7. If wiring and connectors test OK but low condition remains, consider replacing the knee squib module. If replacement does not clear low fault, suspect SRS ECU internal driver fault — consult dealer-level diagnostics and consider ECU replacement or repair.
  8. After repair or component replacement, reconnect battery, clear codes with scan tool, and perform SRS system test/airbag lamp verification. Re-check for codes after a road test and repeated SRS self-checks.
  9. If replaced any SRS components or ECU, follow required registration/coding procedures per manufacturer.

Likely causes

  • Wiring short to ground between driver knee squib and SRS ECU
  • Corroded or loose connector at knee airbag module or ECU
  • Defective knee squib (internal short)
  • Faulty airbag ECU output driver

Fault status

⚠️ Status
Driver knee bolster squib circuit — low (possible short or low-voltage condition). SRS system fault — inspect wiring, connector, squib and ECU.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B11 B1B12 B1B20 B1A10 B1B30
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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