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Home / DTC / B1603 — DR pretensioner squib short

B1603 — DR pretensioner squib short

Detailed page for trouble code B1603.

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Code

B1603

MITSUBISHI B — Body

DR pretensioner squib short

Brand: MITSUBISHI
Type: B — Body
Views: UK: 11 EN: 17 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring in driver pretensioner harness (short to chassis or between conductors)
  • Corroded or loose connector at the pretensioner or SRS control unit
  • Failed pretensioner squib (internal short)
  • Poor repair or aftermarket modification that created a short
  • Faulty airbag/SRS control module or internal connector short

Symptoms

  • Illuminated SRS / airbag warning lamp on instrument cluster
  • Possible failure of driver pretensioner to deploy in event of crash (reduced protection)
  • Stored DTC B1603 (may accompany other SRS codes)
  • No other obvious drivability symptoms

What to check

  • Read SRS codes and freeze-frame data with a compatible diagnostic scanner
  • Visually inspect driver seat harness, connectors, and seat-track area for damage or corrosion
  • Check connector terminals for bent pins, corrosion, or pushed-out contacts
  • Measure continuity and resistance of the pretensioner circuit after disabling SRS power
  • Inspect wiring routing through B-pillar and under-dash where wires bend or are secured

Signal parameters

  • Expected pretensioner (squib) resistance: typically low (approx. 0.5–5 ohms) — consult vehicle service data for exact value
  • Short condition: very low resistance to chassis ground or between squib conductors (below expected range)
  • Open condition: infinite resistance (open circuit) — different fault
  • No battery voltage should be present at squib connector with ignition off; do not attempt live activation

Diagnostic algorithm

  1. Read and record all SRS/airbag DTCs and freeze-frame information with a capable scan tool.
  2. Follow manufacturer safety procedures: disable SRS system and disconnect battery before performing physical checks. Wait the recommended time for capacitors to discharge.
  3. Perform a careful visual inspection of the driver pretensioner wiring and connectors (under seat, seat-track, B-pillar, under-dash). Look for chafe, pinching, corrosion, or aftermarket splices.
  4. Disconnect the pretensioner connector and measure resistance of the squib across its terminals with an ohmmeter. Compare to manufacturer specification. Note: do not attempt to energize the squib.
  5. Check for short to chassis: with pretensioner disconnected, measure resistance between each squib conductor and vehicle chassis ground. Low resistance indicates a short to ground in wiring.
  6. Perform wiggle tests of wiring while monitoring resistance or live scan data (with SRS disabled) to locate intermittent shorts—only if allowed by safety procedures.
  7. If short is localized to wiring or connector, repair or replace damaged wiring/connector per service manual and secure harness away from moving parts.
  8. If wiring and connectors are good but squib shows internal short, replace the pretensioner assembly per manufacturer procedure.
  9. If replacement of harness or pretensioner does not clear fault, suspect SRS control module or its connector; further module-level diagnostics or replacement may be required.
  10. After repairs, clear DTCs and perform SRS system checks as per service manual to confirm the fault is resolved. Reconnect battery and verify SRS lamp extinguishes.

Likely causes

  • Wiring damaged by seat movement or seat-track abrasion (most common)
  • Connector under the seat contaminated/corroded
  • Pretensioner unit failed due to moisture or prior electrical fault
  • Short at junction points or splice in harness behind dash or B-pillar

Fault status

⚠️ Status
Short detected in driver seatbelt pretensioner (squib) circuit — SRS warning lamp illuminated. Repair required before restoring full airbag/pretensioner function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1600 B1601 B1602 B1604 B1605
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Code

B1603

Other B — Body

Lamp Anti-Theft Indicator Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 19 EN: 25 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring in driver pretensioner harness (short to chassis or between conductors)
  • Corroded or loose connector at the pretensioner or SRS control unit
  • Failed pretensioner squib (internal short)
  • Poor repair or aftermarket modification that created a short
  • Faulty airbag/SRS control module or internal connector short

Symptoms

  • Illuminated SRS / airbag warning lamp on instrument cluster
  • Possible failure of driver pretensioner to deploy in event of crash (reduced protection)
  • Stored DTC B1603 (may accompany other SRS codes)
  • No other obvious drivability symptoms

What to check

  • Read SRS codes and freeze-frame data with a compatible diagnostic scanner
  • Visually inspect driver seat harness, connectors, and seat-track area for damage or corrosion
  • Check connector terminals for bent pins, corrosion, or pushed-out contacts
  • Measure continuity and resistance of the pretensioner circuit after disabling SRS power
  • Inspect wiring routing through B-pillar and under-dash where wires bend or are secured

Signal parameters

  • Expected pretensioner (squib) resistance: typically low (approx. 0.5–5 ohms) — consult vehicle service data for exact value
  • Short condition: very low resistance to chassis ground or between squib conductors (below expected range)
  • Open condition: infinite resistance (open circuit) — different fault
  • No battery voltage should be present at squib connector with ignition off; do not attempt live activation

Diagnostic algorithm

  1. Read and record all SRS/airbag DTCs and freeze-frame information with a capable scan tool.
  2. Follow manufacturer safety procedures: disable SRS system and disconnect battery before performing physical checks. Wait the recommended time for capacitors to discharge.
  3. Perform a careful visual inspection of the driver pretensioner wiring and connectors (under seat, seat-track, B-pillar, under-dash). Look for chafe, pinching, corrosion, or aftermarket splices.
  4. Disconnect the pretensioner connector and measure resistance of the squib across its terminals with an ohmmeter. Compare to manufacturer specification. Note: do not attempt to energize the squib.
  5. Check for short to chassis: with pretensioner disconnected, measure resistance between each squib conductor and vehicle chassis ground. Low resistance indicates a short to ground in wiring.
  6. Perform wiggle tests of wiring while monitoring resistance or live scan data (with SRS disabled) to locate intermittent shorts—only if allowed by safety procedures.
  7. If short is localized to wiring or connector, repair or replace damaged wiring/connector per service manual and secure harness away from moving parts.
  8. If wiring and connectors are good but squib shows internal short, replace the pretensioner assembly per manufacturer procedure.
  9. If replacement of harness or pretensioner does not clear fault, suspect SRS control module or its connector; further module-level diagnostics or replacement may be required.
  10. After repairs, clear DTCs and perform SRS system checks as per service manual to confirm the fault is resolved. Reconnect battery and verify SRS lamp extinguishes.

Likely causes

  • Wiring damaged by seat movement or seat-track abrasion (most common)
  • Connector under the seat contaminated/corroded
  • Pretensioner unit failed due to moisture or prior electrical fault
  • Short at junction points or splice in harness behind dash or B-pillar

Fault status

⚠️ Status
Short detected in driver seatbelt pretensioner (squib) circuit — SRS warning lamp illuminated. Repair required before restoring full airbag/pretensioner function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1600 B1601 B1602 B1604 B1605
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