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Home / DTC / B1B13 — DR.knee bolster squib short

B1B13 — DR.knee bolster squib short

Detailed page for trouble code B1B13.

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Code

B1B13

MITSUBISHI B — Body

DR.knee bolster squib short

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Damaged wiring harness for driver knee squib (chafing, pinched, torn insulation)
  • Corroded or loose connector at knee bolster squib or airbag control module
  • Short to ground or short to battery (power) in the squib circuit
  • Failed knee bolster squib (internal short in squib coil)
  • Poor or bent pins in connector or water ingress
  • Previous repair or crash damage with incomplete repair of SRS components

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • DTC B1B13 stored in airbag control module memory
  • Possible disablement of related airbag functions until fault cleared and repaired
  • No other drivability symptoms (electrical) other than warning indicators

What to check

  • Confirm DTC B1B13 with a scan tool and record freeze-frame or related codes
  • Visually inspect knee bolster area, connectors, and wiring for damage, corrosion or loose pins
  • Check vehicle service history for recent work or collision repairs in dash area
  • Ensure battery is charged and stable before electrical testing (observe SRS battery-disconnect procedure)
  • Use multimeter to measure squib circuit resistance with airbag module connector disconnected (see signal parameters)
  • Check continuity between squib circuit and chassis ground / battery positive to detect shorts to ground or power

Signal parameters

  • Typical squib coil resistance is low — commonly around 1–3 ohms (manufacturer values vary). Values much lower than expected can indicate a short to power/ground; very high or open-circuit indicates broken/ open squib wiring.
  • No continuous battery voltage should be present at the squib circuit during normal non-deploy operation. Do not apply external power to squib connectors.
  • When measuring resistance, always isolate the circuit (disconnect airbag module) and follow manufacturer wait times after battery disconnect.

Diagnostic algorithm

  1. Safety first: Disable SRS power per the Mitsubishi service manual — disconnect negative battery terminal and wait the specified time (typically several minutes) before touching connectors or wiring.
  2. Connect SRS-capable scan tool, read and record B1B13 and any related SRS codes and freeze-frame data.
  3. Perform a thorough visual inspection of the knee bolster, trim, connectors and wiring routing (under dash, around seat and hinge areas). Look for chafing, crushed insulation, corrosion or water entry.
  4. With battery disconnected and waiting period observed, access the knee bolster squib connector. Disconnect the squib connector from the airbag module/connector.
  5. Measure squib resistance at the squib-side connector using a low-resistance ohmmeter. Compare to manufacturer specification (typical ~1–3 ohms). If resistance is within spec, proceed to module-side checks.
  6. Measure resistance at the airbag control module connector to the squib pin. If readings differ between module and squib side, suspect harness/intermediate connector fault.
  7. Check for short to ground: measure resistance between squib circuit and chassis ground. Very low resistance suggests a short to ground.
  8. Check for short to battery: measure resistance between squib circuit and battery positive. Very low resistance suggests short to power. Inspect wiring harness routing and repair any short locations.
  9. Inspect and clean connectors; repair or replace any damaged pins or corroded connectors. Replace the squib if internal short is confirmed or if resistance is out of spec and wiring is good.
  10. After repair or component replacement, reconnect and clear codes with scan tool. Reconnect battery, turn ignition ON and verify that SRS lamp extinguishes and that no B1B13 returns. If code returns, proceed to replace/control module only after exhaustive wiring/squib checks and following manufacturer guidance.
  11. Record work performed and ensure all SRS components are reinstalled per torque/retention specs. If uncertain, escalate to a qualified SRS technician or follow Mitsubishi dealer procedures.

Likely causes

  • Connector corrosion or bent pin at knee bolster squib
  • Chafed wiring where harness passes under dash or through hinge area
  • Failed squib (internal short)

Fault status

⚠️ Status
Airbag control unit detects short circuit in driver knee bolster squib (B1B13). SRS warning lamp ON. Repair required before restoring full airbag function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–2.0 hours

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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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