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Home / DTC / B1B11 — DR.knee bolster squib high

B1B11 — DR.knee bolster squib high

Detailed page for trouble code B1B11.

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22,461specific
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Code

B1B11

MITSUBISHI B — Body

DR.knee bolster squib high

Brand: MITSUBISHI
Type: B — Body
Views: UK: 21 EN: 24 RU: 22
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Page language: EN

Causes

  • Open or high‑resistance wiring in the driver knee squib circuit
  • Corroded, bent or disconnected squib connector
  • Squib (airbag inflator wiring) damaged or internally failed
  • Short to battery positive (B+) in the harness or connector
  • Faulty SRS (airbag) control module or internal driver
  • Poor repair/aftermarket wiring or previous crash damage not repaired properly

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument cluster
  • Driver knee airbag disabled (no deployment allowed)
  • Possible additional airbag system related codes stored
  • Vehicle may show general SRS fault messages on scan tool

What to check

  • Retrieve full SRS code list and freeze frame data with a capable scan tool
  • Visually inspect driver knee airbag connector and wiring for damage, corrosion, or loose terminals
  • Confirm vehicle has no undeployed crash data—check for prior deployment history
  • Disconnect battery negative terminal and wait per manufacturer procedure before touching SRS connectors
  • Measure squib circuit resistance at the knee airbag connector (with connector disconnected)
  • Measure voltage at squib connector relative to ground with ignition ON (use caution)

Signal parameters

  • Typical intact squib resistance: ~1–5 ohms (manufacturer specific — consult service manual)
  • Considered open/high resistance if measured >>10–30 ohms or infinite
  • Short to battery voltage: squib connector shows ~12 V (battery voltage) when it should not
  • Short to ground: squib connector shows ~0 V (ground) when it should not
  • SRS ECU diagnostic voltage thresholds vary by model — values above allowed threshold trigger HIGH code (refer to factory spec)

Diagnostic algorithm

  1. Read and record all SRS codes and freeze frame data with a qualified scan tool
  2. Disconnect battery negative terminal and wait the recommended time in the service manual to disable the SRS system before handling connectors
  3. Perform a careful visual inspection of knee bolster, connector, and harness routing for damage, water ingress, or poor repairs
  4. Disconnect knee squib connector at the airbag and measure resistance across the squib using a low‑ohm meter; compare to manufacturer spec; replace squib if out of spec
  5. With connector disconnected, measure voltage at the squib harness pins with ignition ON to check for short to B+ or short to ground (observe safety procedures)
  6. Perform continuity/resistance checks between the squib connector and the SRS ECU connector to locate opens or high resistance; repair broken wires or corroded terminals
  7. If wiring and squib check good, test/replace the driver knee airbag squib assembly and then re‑scan
  8. If fault persists after verifying harness and squib, consider SRS control module fault — consult factory procedures before replacement and never replace module without confirming circuit integrity
  9. Clear codes and perform full system verification; ensure no other SRS faults remain and re‑enable the airbag system per manufacturer instructions

Likely causes

  • Disconnected or corroded knee squib connector near the knee bolster
  • Broken/chafed conductor in harness (open/high resistance) between squib and SRS ECU
  • Short to battery voltage at squib connector or harness splice
  • Failed knee squib (open or abnormal internal resistance)
  • Faulty airbag control module reporting incorrect circuit voltage

Fault status

⚠️ Status
SRS control module detects HIGH voltage/over‑voltage condition on driver knee bolster squib circuit. Knee airbag circuit disabled and fault stored. Inspect squib, connector, wiring and SRS module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1B10 B1B12 B1B13 B1801 B1610
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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