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Home / DTC / B1148 — Passenger Side Air Bag System Malfunction

B1148 — Passenger Side Air Bag System Malfunction

Detailed page for trouble code B1148.

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Code

B1148

HUMMER B — Body

Passenger Side Air Bag System Malfunction

Brand: HUMMER
Type: B — Body
Views: UK: 7 EN: 10 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in passenger airbag squib/inflator circuit
  • Faulty passenger airbag (inflator/squib)
  • Poor or corroded connector or ground at the passenger seat wiring
  • Faulty occupancy/seat weight sensor or mat module
  • SRS (airbag) control module or software fault
  • Damaged wiring from seat movement, seat tracks, or previous repairs

Symptoms

  • Illuminated SRS/AIRBAG warning lamp on instrument cluster
  • Passenger airbag disabled or inoperative message (if equipped)
  • Airbag indicator may reset if vehicle moved or connector reseated then return
  • Possible related body/control module communication warnings
  • Diagnostic trouble code B1148 stored in SRS module

What to check

  • Read and record all SRS and related module DTCs and freeze-frame data with a capable scan tool
  • Confirm SRS warning lamp behavior (on, flashes, stays off)
  • Perform careful visual inspection of passenger seat area: connectors, wiring harness, seatbelt buckle sensors, occupancy mat, and seat track for damage
  • Check connectors under passenger seat for corrosion, water intrusion or loose pins and proper mating
  • Verify SRS control module power and ground circuits using a multimeter per manufacturer procedure
  • Check for related communication/CAN codes that could affect SRS data

Signal parameters

  • SRS control module supply voltage (approx. battery voltage, 12V)
  • SRS module ground continuity
  • Passenger airbag squib/inflator resistance (ohms) — compare to factory spec
  • Occupant classification sensor / seat mat resistance or voltage outputs (per OEM spec)
  • Airbag lamp status (on/off) and SRS module readiness bit
  • CAN/SRI messages from occupant classification or seat modules (presence/heartbeat)

Diagnostic algorithm

  1. Safety first: Disable battery negative terminal and follow manufacturer SRS disable procedure; wait specified time before working on SRS components.
  2. Scan: Use a diagnostic scanner that supports SRS to read/record B1148 and any related codes; note freeze-frame data and pending codes.
  3. Visual: Inspect passenger seat, seat cushion and underseat area for damage, water, loose connectors or pinched wires. Check occupant sensor mat for contamination.
  4. Connectors: Unplug and inspect the passenger airbag connector, occupant sensor/seat module connectors and ground points. Clean and re-pin if corrosion or damage is found.
  5. Power/Ground: With safe procedures, verify 12V supply and ground to SRS/occupant sensor modules at their connectors per wiring diagram.
  6. Continuity/Resistance: Measure squib/inflator resistance and occupant sensor resistances and compare to OEM specs. Do NOT attempt to fire test squib; only measure resistance according to manufacturer guidelines.
  7. Wiggle test: With scanner connected and SRS powered (only if manufacturer allows), perform a careful wiggle test of harness while watching live data to find intermittent opens/shorts. Follow safety protocols.
  8. Module/Software: If wiring and connectors are good, check for required SRS module software updates, reprogramming, or replacement history. Relearn or recalibrate occupant classification system if required by OEM.
  9. Repair and verify: Repair any wiring/connector faults using correct splice/location procedures, replace faulty modules or sensors per OEM guidance, clear codes and perform functional tests and road/seat occupancy diagnostics as specified.
  10. Final: Re-enable SRS power, verify airbag light extinguishes and no return of B1148; if DTC returns, continue advanced diagnostics or consult OEM technical service information.

Likely causes

  • Open or shorted passenger-side airbag squib connector under the seat
  • Broken wire or pinched harness where wiring passes through seat tracks
  • Disconnected or corroded ground or power supply to SRS/occupant detection module
  • Faulty passenger occupant classification sensor (weight mat) or connector contamination
  • SRS control module fault or incorrect module coding

Fault status

⚠️ Status
Passenger side air bag system malfunction — inspect passenger airbag circuit, occupant sensor, connectors and SRS module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1140 B1146 B1149 B1150 B1200
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Code

B1148

LAND ROVER B — Body

Front fog lights right

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 11 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in passenger airbag squib/inflator circuit
  • Faulty passenger airbag (inflator/squib)
  • Poor or corroded connector or ground at the passenger seat wiring
  • Faulty occupancy/seat weight sensor or mat module
  • SRS (airbag) control module or software fault
  • Damaged wiring from seat movement, seat tracks, or previous repairs

Symptoms

  • Illuminated SRS/AIRBAG warning lamp on instrument cluster
  • Passenger airbag disabled or inoperative message (if equipped)
  • Airbag indicator may reset if vehicle moved or connector reseated then return
  • Possible related body/control module communication warnings
  • Diagnostic trouble code B1148 stored in SRS module

What to check

  • Read and record all SRS and related module DTCs and freeze-frame data with a capable scan tool
  • Confirm SRS warning lamp behavior (on, flashes, stays off)
  • Perform careful visual inspection of passenger seat area: connectors, wiring harness, seatbelt buckle sensors, occupancy mat, and seat track for damage
  • Check connectors under passenger seat for corrosion, water intrusion or loose pins and proper mating
  • Verify SRS control module power and ground circuits using a multimeter per manufacturer procedure
  • Check for related communication/CAN codes that could affect SRS data

Signal parameters

  • SRS control module supply voltage (approx. battery voltage, 12V)
  • SRS module ground continuity
  • Passenger airbag squib/inflator resistance (ohms) — compare to factory spec
  • Occupant classification sensor / seat mat resistance or voltage outputs (per OEM spec)
  • Airbag lamp status (on/off) and SRS module readiness bit
  • CAN/SRI messages from occupant classification or seat modules (presence/heartbeat)

Diagnostic algorithm

  1. Safety first: Disable battery negative terminal and follow manufacturer SRS disable procedure; wait specified time before working on SRS components.
  2. Scan: Use a diagnostic scanner that supports SRS to read/record B1148 and any related codes; note freeze-frame data and pending codes.
  3. Visual: Inspect passenger seat, seat cushion and underseat area for damage, water, loose connectors or pinched wires. Check occupant sensor mat for contamination.
  4. Connectors: Unplug and inspect the passenger airbag connector, occupant sensor/seat module connectors and ground points. Clean and re-pin if corrosion or damage is found.
  5. Power/Ground: With safe procedures, verify 12V supply and ground to SRS/occupant sensor modules at their connectors per wiring diagram.
  6. Continuity/Resistance: Measure squib/inflator resistance and occupant sensor resistances and compare to OEM specs. Do NOT attempt to fire test squib; only measure resistance according to manufacturer guidelines.
  7. Wiggle test: With scanner connected and SRS powered (only if manufacturer allows), perform a careful wiggle test of harness while watching live data to find intermittent opens/shorts. Follow safety protocols.
  8. Module/Software: If wiring and connectors are good, check for required SRS module software updates, reprogramming, or replacement history. Relearn or recalibrate occupant classification system if required by OEM.
  9. Repair and verify: Repair any wiring/connector faults using correct splice/location procedures, replace faulty modules or sensors per OEM guidance, clear codes and perform functional tests and road/seat occupancy diagnostics as specified.
  10. Final: Re-enable SRS power, verify airbag light extinguishes and no return of B1148; if DTC returns, continue advanced diagnostics or consult OEM technical service information.

Likely causes

  • Open or shorted passenger-side airbag squib connector under the seat
  • Broken wire or pinched harness where wiring passes through seat tracks
  • Disconnected or corroded ground or power supply to SRS/occupant detection module
  • Faulty passenger occupant classification sensor (weight mat) or connector contamination
  • SRS control module fault or incorrect module coding

Fault status

⚠️ Status
Passenger side air bag system malfunction — inspect passenger airbag circuit, occupant sensor, connectors and SRS module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1140 B1146 B1149 B1150 B1200
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