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Home / DTC / B1C38 — DR.pretensioner circuit low

B1C38 — DR.pretensioner circuit low

Detailed page for trouble code B1C38.

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Code

B1C38

MITSUBISHI B — Body

DR.pretensioner circuit low

Brand: MITSUBISHI
Type: B — Body
Views: UK: 20 EN: 25 RU: 29
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Page language: EN

Causes

  • Poor or corroded connector at driver pretensioner or steering column
  • Damaged/chafed wiring harness to the driver pretensioner
  • Faulty steering wheel clock spring (spiral cable)
  • Open or high-resistance pretensioner squib (seatbelt pretensioner)
  • Short to ground or short to battery on the pretensioner circuit
  • SRS control module internal fault or incorrect reference voltage

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Possible additional SRS-related DTCs stored
  • Driver pretensioner may be disabled (inhibited deployment) until fault cleared and repaired
  • Steering-wheel-mounted controls or horn malfunctioning if clock spring is affected
  • Vehicle may fail safety inspection for SRS faults

What to check

  • Read and record all SRS codes and freeze-frame data with a suitable scan tool
  • Note whether the code is current or historical and whether other airbag/pretensioner codes are present
  • Visually inspect steering wheel, column covers and driver airbag connector for damage or loose connectors
  • Inspect wiring harness routing through the steering column for chafing, pinching or damage
  • Check battery voltage and charging system health prior to SRS testing
  • Confirm any recent steering/airbag work or aftermarket parts that might affect the circuit

Signal parameters

  • Pretensioner (squib) continuity expected (low ohms) — typically a low resistance value (example typical range 0.5–5 ohms depending on vehicle)
  • Open-circuit indicates very high/OL resistance; short to ground/12V will show near 0 ohms to ground or battery
  • ECU monitors voltage/current on squib circuit; a significant drop or unexpected voltage is flagged as 'low'
  • No continuity between pretensioner terminals and module indicates open circuit
  • Resistance should remain stable while gently rotating steering wheel (no intermittent change)

Diagnostic algorithm

  1. Retrieve and record all SRS DTCs with a capable scan tool; note freeze-frame and ignition state when code set
  2. Verify battery voltage is within normal range; recharge if low and retest
  3. Visually inspect steering wheel area, airbag connectors and harness for damage or corrosion
  4. Follow vehicle manufacturer SRS safety procedure (disable battery negative terminal and wait the specified time) before performing hands-on checks
  5. Access driver pretensioner connector (at steering wheel or column) and, with connector disconnected from pretensioner, measure resistance across pretensioner squib terminals. Compare to manufacturer specification (expect low ohms).
  6. If resistance is within spec, backprobe/measure continuity from pretensioner connector pins to the SRS control module connector to confirm wiring continuity and rule out open circuits
  7. Check for shorts to ground or battery: measure resistance from each pretensioner circuit conductor to chassis ground and to battery positive (with battery disconnected). High continuity to ground/12V indicates short.
  8. Inspect and test the clock spring/spiral cable: measure resistance while gently turning the steering wheel through range of motion to detect intermittent changes; replace clock spring if intermittent or open
  9. If wiring and clock spring are good but resistance is out of specification, replace the driver pretensioner squib (airbag/seatbelt pretensioner) per manufacturer instructions
  10. After repair or replacement, clear codes with scan tool, perform SRS system checks and any necessary calibration (steering angle, clockspring initialization) as required by manufacturer
  11. If DTC persists after replacing suspect components, consider SRS control module fault and consult manufacturer repair information or authorized dealer for module testing/replacement

Likely causes

  • Loose/corroded connector at the driver airbag/pretensioner
  • Damaged clock spring causing intermittent/low connection
  • High resistance or open in pretensioner squib
  • Wiring short to ground in steering column harness
  • Connector pin pushed out or poor crimp at harness splice

Fault status

⚠️ Status
SRS control module detected low signal/voltage on driver pretensioner (seatbelt) circuit — low continuity or voltage below threshold.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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406

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