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Home / DTC / B1472 — FL pretensioner squib grounding

B1472 — FL pretensioner squib grounding

Detailed page for trouble code B1472.

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Code

B1472

MITSUBISHI B — Body

FL pretensioner squib grounding

Brand: MITSUBISHI
Type: B — Body
Views: UK: 7 EN: 13 RU: 8
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to chassis ground in the pretensioner squib wiring
  • Open or shorted squib (pretensioner) element
  • Poor, corroded or disconnected connector at pretensioner or SRS ECU
  • Damage to wiring harness (chafing, pinched, water ingress)
  • Faulty clock spring (if wiring passes through steering column) or harness splice
  • Faulty SRS control module (rare) or internal ECU connector problem

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Possible multiple SRS fault codes stored
  • Seat belt pretensioner will not deploy in a crash (reduces system protection)
  • No obvious symptoms other than SRS lamp until inspection

What to check

  • Verify SRS warning lamp behavior and record codes/freeze frame with scan tool
  • Observe SRS lamp self-check at key-on to confirm lamp operation
  • Visually inspect pretensioner connector and harness for damage, corrosion, or water
  • Check for DTCs related to clock spring, driver airbag, or other squibs
  • Measure resistance of pretensioner squib with battery disconnected and system disabled
  • Check continuity between pretensioner circuit and chassis ground (should be open)

Signal parameters

  • Expected squib resistance (typical): approx. 1–5 ohms across squib terminals (verify specific factory spec)
  • Resistance to chassis ground from squib circuit: open / very high (>10 kΩ) — no continuity to ground
  • When measuring at SRS ECU connector with harness disconnected and key off: squib circuit should show expected low ohms across squib pins only, not to chassis
  • No steady battery voltage should be present on squib pins during normal key-on; diagnostics use short pulses (use manufacturer scan tool to view driver values)

Diagnostic algorithm

  1. Safety first: disable the SRS system per manufacturer procedure — disconnect battery negative and wait recommended time before touch (follow Mitsubishi service manual).
  2. Use a compatible scan tool to confirm B1472 and clear codes; see if code returns immediately or intermittently.
  3. Visually inspect the front-left pretensioner connector, adjacent wiring, and body harness routing for damage, corrosion, melted insulation, or signs of water intrusion.
  4. With battery disconnected and SRS disabled, disconnect the pretensioner connector and measure resistance across the squib terminals. Compare to factory spec; an open or very high resistance suggests open circuit; very low/near zero may indicate shorted element.
  5. Measure resistance between each squib terminal and chassis ground. There should be no continuity; continuity indicates short-to-ground in wiring or squib.
  6. Back-probe at the SRS ECU connector (or harness splice) to isolate where the short occurs. If ECU-side wiring shows no short but squib side does, the fault is downstream near pretensioner.
  7. Wiggle test harness and connectors while monitoring resistance or live data (with scan tool) to find intermittent shorts.
  8. If wiring is intact but squib shows abnormal resistance, replace the pretensioner assembly. If short in wiring, repair harness using correct gauge wire, solder/crimp with heat shrink, and insulate; replace damaged connectors or harness sections as required.
  9. If the clock spring is part of the circuit and tests abnormal, replace clock spring per procedure.
  10. After repairs, clear codes, reconnect battery, and perform SRS system readiness check with scan tool. Verify the SRS lamp extinguishes and code does not return.
  11. If code persists after wiring and component checks, consider SRS control module connector/circuit faults and consult factory diagnostics before replacing ECU.

Likely causes

  • Damaged or chafed wire from pretensioner to SRS ECU causing short to ground
  • Disconnected/corroded connector at the pretensioner or intermediate connector
  • Failed pretensioner squib element (internal short)
  • Clock spring damage (if route includes steering column) or connector damage

Fault status

⚠️ Status
SRS control module detected grounding (short to ground) in front-left pretensioner squib circuit. Airbag lamp on; pretensioner circuit fault present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1470 B1471 B1473 B1460 B1500
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Code

B1472

Other B — Body

Lamp Headlamp Input Circuit Short To Ground

Brand: Other
Type: B — Body
Views: UK: 11 EN: 23 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to chassis ground in the pretensioner squib wiring
  • Open or shorted squib (pretensioner) element
  • Poor, corroded or disconnected connector at pretensioner or SRS ECU
  • Damage to wiring harness (chafing, pinched, water ingress)
  • Faulty clock spring (if wiring passes through steering column) or harness splice
  • Faulty SRS control module (rare) or internal ECU connector problem

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Possible multiple SRS fault codes stored
  • Seat belt pretensioner will not deploy in a crash (reduces system protection)
  • No obvious symptoms other than SRS lamp until inspection

What to check

  • Verify SRS warning lamp behavior and record codes/freeze frame with scan tool
  • Observe SRS lamp self-check at key-on to confirm lamp operation
  • Visually inspect pretensioner connector and harness for damage, corrosion, or water
  • Check for DTCs related to clock spring, driver airbag, or other squibs
  • Measure resistance of pretensioner squib with battery disconnected and system disabled
  • Check continuity between pretensioner circuit and chassis ground (should be open)

Signal parameters

  • Expected squib resistance (typical): approx. 1–5 ohms across squib terminals (verify specific factory spec)
  • Resistance to chassis ground from squib circuit: open / very high (>10 kΩ) — no continuity to ground
  • When measuring at SRS ECU connector with harness disconnected and key off: squib circuit should show expected low ohms across squib pins only, not to chassis
  • No steady battery voltage should be present on squib pins during normal key-on; diagnostics use short pulses (use manufacturer scan tool to view driver values)

Diagnostic algorithm

  1. Safety first: disable the SRS system per manufacturer procedure — disconnect battery negative and wait recommended time before touch (follow Mitsubishi service manual).
  2. Use a compatible scan tool to confirm B1472 and clear codes; see if code returns immediately or intermittently.
  3. Visually inspect the front-left pretensioner connector, adjacent wiring, and body harness routing for damage, corrosion, melted insulation, or signs of water intrusion.
  4. With battery disconnected and SRS disabled, disconnect the pretensioner connector and measure resistance across the squib terminals. Compare to factory spec; an open or very high resistance suggests open circuit; very low/near zero may indicate shorted element.
  5. Measure resistance between each squib terminal and chassis ground. There should be no continuity; continuity indicates short-to-ground in wiring or squib.
  6. Back-probe at the SRS ECU connector (or harness splice) to isolate where the short occurs. If ECU-side wiring shows no short but squib side does, the fault is downstream near pretensioner.
  7. Wiggle test harness and connectors while monitoring resistance or live data (with scan tool) to find intermittent shorts.
  8. If wiring is intact but squib shows abnormal resistance, replace the pretensioner assembly. If short in wiring, repair harness using correct gauge wire, solder/crimp with heat shrink, and insulate; replace damaged connectors or harness sections as required.
  9. If the clock spring is part of the circuit and tests abnormal, replace clock spring per procedure.
  10. After repairs, clear codes, reconnect battery, and perform SRS system readiness check with scan tool. Verify the SRS lamp extinguishes and code does not return.
  11. If code persists after wiring and component checks, consider SRS control module connector/circuit faults and consult factory diagnostics before replacing ECU.

Likely causes

  • Damaged or chafed wire from pretensioner to SRS ECU causing short to ground
  • Disconnected/corroded connector at the pretensioner or intermediate connector
  • Failed pretensioner squib element (internal short)
  • Clock spring damage (if route includes steering column) or connector damage

Fault status

⚠️ Status
SRS control module detected grounding (short to ground) in front-left pretensioner squib circuit. Airbag lamp on; pretensioner circuit fault present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1470 B1471 B1473 B1460 B1500
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