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Home / DTC / B1500 — RR curtain ABG squib short

B1500 — RR curtain ABG squib short

Detailed page for trouble code B1500.

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Code

B1500

MITSUBISHI B — Body

RR curtain ABG squib short

Brand: MITSUBISHI
Type: B — Body
Views: UK: 21 EN: 25 RU: 23
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Page language: EN

Causes

  • Short to ground or battery positive in the rear curtain squib wiring
  • Damaged, chafed, or pinched harness near C‑pillar or seat area
  • Corroded or loose connector terminals at squib or SRS ECU
  • Faulty rear curtain squib (internal short)
  • Water intrusion into connector or harness
  • Improper previous repair (incorrect routing, damaged insulation)

Symptoms

  • SRS / airbag warning lamp illuminated on instrument cluster
  • Rear curtain airbags disabled (airbag lamp will remain on)
  • Possible related DTCs stored for other airbag squibs or communication faults
  • No effect on engine drivability (no drivetrain symptoms)

What to check

  • Read and record all stored SRS codes with a compatible scan tool
  • Visual inspection of rear curtain wiring, connectors, and available harness routing (look for chafing, damage, moisture)
  • Check for other SRS codes that may indicate common failures or module faults
  • Measure squib circuit resistance with ignition OFF and battery disconnected (see signal_params)
  • Inspect connector terminals for corrosion, bent pins, or poor mating
  • Check for aftermarket antennas, sounders, or seat harnesses that may interfere with the SRS wiring

Signal parameters

  • Expected static squib resistance (typical): approximately 1–5 ohms for many curtain squibs (manufacturer-specific).
  • Short condition: resistance near 0 ohms or continuity to ground/12V depending on circuit fault.
  • Open circuit: infinite/high resistance (open) between squib terminals.
  • Do not apply battery voltage to squib for testing. Use DMM only and follow SRS safety procedure.

Diagnostic algorithm

  1. SAFETY FIRST: Disable SRS system per manufacturer's procedure (disconnect battery negative and wait specified time; consult service manual).
  2. Use a compatible scan tool to read and record all SRS / airbag codes and freeze frame data. Note any related communication faults.
  3. Visually inspect the rear curtain airbag area: examine the curtain squib connector, harness routing along the C‑pillar and roof rail, seat belt anchor points and any areas where the harness flexes or is clamped.
  4. With ignition OFF and battery disconnected, disconnect the rear curtain squib connector(s). Check connector condition and for corrosion or bent pins.
  5. Measure resistance across the squib terminals at the connector using a DMM. Compare to expected range (see signal_params). A resistance near 0 ohms indicates a short; infinite resistance indicates open.
  6. If squib resistance is low (short), isolate harness: disconnect intermediate connectors/splices and measure from squib harness to chassis ground and to battery positive to find short location.
  7. Inspect wiring continuity between the squib connector and the SRS ECU connector. Repair any shorted or damaged sections (replace harness section or repair with manufacturer-approved methods).
  8. If wiring and connectors are good but resistance remains abnormally low, suspect a defective squib — replace the curtain airbag assembly per OEM procedure.
  9. After repairs or replacements, clear codes with the scan tool, reconnect battery per safety procedure, and perform an SRS system relearn or self-test. Confirm code does not return.
  10. If fault persists and wiring/squib checks are normal, suspect SRS control module internal fault and follow manufacturer diagnostics for module replacement or professional calibration.

Likely causes

  • Harness chafing where it passes through body panels (common at C‑pillar/door seams)
  • Connector corrosion or bent terminals at the squib connector
  • Damaged squib due to impact or moisture
  • Shorted splice or aftermarket device accidentally connected to the squib circuit

Fault status

⚠️ Status
B1500 — Rear curtain airbag (RR curtain) squib short detected. Low resistance/short in the squib circuit has been recorded; SRS warning lamp will be on and the curtain airbag may be disabled until the fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

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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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