Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B2948 — Occupant Classification Sensor Circuit Fault — Passenger Seat

B2948 — Occupant Classification Sensor Circuit Fault — Passenger Seat

Detailed page for trouble code B2948.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B2948

Generic B — Body

Occupant Classification Sensor Circuit Fault — Passenger Seat

Brand: Generic
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in passenger seat occupant classification sensor harness
  • Corroded, loose or damaged connector at seat sensor or module
  • Faulty occupant classification sensor mat (pressure/weight sensors) in the passenger seat
  • Faulty occupant classification / airbag control module or internal electronics
  • Water intrusion or contamination in the seat cushion or connector
  • Aftermarket seat covers, seat heaters, or prior repairs interfering with sensor operation

Symptoms

  • Airbag warning lamp ON (SRS / Supplemental Restraint System)
  • Passenger airbag status may read OFF or Unknown on dash or infotainment
  • Passenger occupant detection incorrect (no occupant detected or incorrect weight class)
  • Stored/active diagnostic trouble code B2948
  • Intermittent changes in passenger airbag status when occupying or moving the seat

What to check

  • Read SRS/OCS module using a scan tool; record freeze frame and related codes
  • Visual inspection of passenger seat, connectors under seat, and wiring for damage, corrosion, or moisture
  • Verify seat covers / aftermarket items removed to rule out interference
  • Check for active communication with airbag/OCS module on CAN/LIN using scan tool
  • Perform basic power and ground checks at the seat sensor connector (with ignition ON per manufacturer procedure)
  • Move seat through its full travel and watch for intermittent faults or connector/wiring movement

Signal parameters

  • Reference supply to sensor: typically 5 V (±0.25 V) — verify per OEM specification
  • Sensor output: varies with load — expect a measurable change when weight is applied; typical 0–5 V analog or changing digital sensor data
  • Communication: module may report occupant classification over CAN or a dedicated serial bus — check for valid messages and live data
  • Continuity: power/ground circuits should show low resistance (near 0 Ω to tens of ohms) to ground/power rails; sensor element resistance will change when load applied
  • No short to battery voltage or ground on the sensor signal line(s)

Diagnostic algorithm

  1. Safety: Disable SRS per manufacturer procedure (battery disconnect and wait or use specified SRS disabling method).
  2. Scan tool: Connect a capable scan tool, read codes and freeze frame, note related SRS/OCS codes and module software level.
  3. Visual: Inspect passenger seat cushion, connectors beneath seat, wiring harness routing by seat rails for chafing, pin damage, water intrusion or corrosion. Check for aftermarket covers or heaters.
  4. Connectors: With ignition ON (if safe and per procedure), probe power (Vref) and ground at the sensor/mat connector. Compare to OEM spec. Check for intermittent with wiggle test while watching live data.
  5. Signal check: Monitor sensor output or OCS data on scan tool while applying known weight (e.g., test weight or person) and observe expected change. If sensor is analog, measure voltage change; if digital, observe classification status change.
  6. Continuity: If no signal change, disconnect connector and test continuity/resistance of sensor elements and harness back to module. Look for opens, shorts, or high resistance.
  7. Isolate: If wiring and connectors are good, remove seat trim/cushion as required and inspect/bench-test the sensor mat. Replace sensor mat if element failure is confirmed.
  8. Module check: If sensor and wiring are good but fault persists and communications are normal, consider module fault. Confirm with OEM diagnostics before module replacement.
  9. Repair: Repair or replace damaged wiring, connectors, or sensor mat. Use OEM parts for OCS. Reassemble and clear codes.
  10. Verify: Re-enable SRS, perform full system checks, verify live OCS status and that the airbag lamp is extinguished and passenger classification behaves correctly during test.

Likely causes

  • Damaged/loose connector at the passenger seat sensor or module
  • Broken wire or short in wiring harness under the seat due to movement
  • Failed seat mat/sensor element from water ingress or mechanical damage

Fault status

⚠️ Status
Occupant classification sensor circuit fault detected for passenger seat. Fault stored in SRS/OCS module; may be current or intermittent. Airbag/passenger classification may be inhibited or report incorrect status.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B2949 B2950 B1650 U0121 U0231
9,301

The library contains 9,301 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

ALFA ROMEO
89
AUDI
1,243
BMW
479
CADILLAC
206
CHEVROLET
456
CHRYSLER
193
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
KIA
27
LAND ROVER
320
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,209
TRIUMPH
131
VOLKSWAGEN
626
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B2948

HUMMER B — Body

Security System Sensor Power Circuit High

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in passenger seat occupant classification sensor harness
  • Corroded, loose or damaged connector at seat sensor or module
  • Faulty occupant classification sensor mat (pressure/weight sensors) in the passenger seat
  • Faulty occupant classification / airbag control module or internal electronics
  • Water intrusion or contamination in the seat cushion or connector
  • Aftermarket seat covers, seat heaters, or prior repairs interfering with sensor operation

Symptoms

  • Airbag warning lamp ON (SRS / Supplemental Restraint System)
  • Passenger airbag status may read OFF or Unknown on dash or infotainment
  • Passenger occupant detection incorrect (no occupant detected or incorrect weight class)
  • Stored/active diagnostic trouble code B2948
  • Intermittent changes in passenger airbag status when occupying or moving the seat

What to check

  • Read SRS/OCS module using a scan tool; record freeze frame and related codes
  • Visual inspection of passenger seat, connectors under seat, and wiring for damage, corrosion, or moisture
  • Verify seat covers / aftermarket items removed to rule out interference
  • Check for active communication with airbag/OCS module on CAN/LIN using scan tool
  • Perform basic power and ground checks at the seat sensor connector (with ignition ON per manufacturer procedure)
  • Move seat through its full travel and watch for intermittent faults or connector/wiring movement

Signal parameters

  • Reference supply to sensor: typically 5 V (±0.25 V) — verify per OEM specification
  • Sensor output: varies with load — expect a measurable change when weight is applied; typical 0–5 V analog or changing digital sensor data
  • Communication: module may report occupant classification over CAN or a dedicated serial bus — check for valid messages and live data
  • Continuity: power/ground circuits should show low resistance (near 0 Ω to tens of ohms) to ground/power rails; sensor element resistance will change when load applied
  • No short to battery voltage or ground on the sensor signal line(s)

Diagnostic algorithm

  1. Safety: Disable SRS per manufacturer procedure (battery disconnect and wait or use specified SRS disabling method).
  2. Scan tool: Connect a capable scan tool, read codes and freeze frame, note related SRS/OCS codes and module software level.
  3. Visual: Inspect passenger seat cushion, connectors beneath seat, wiring harness routing by seat rails for chafing, pin damage, water intrusion or corrosion. Check for aftermarket covers or heaters.
  4. Connectors: With ignition ON (if safe and per procedure), probe power (Vref) and ground at the sensor/mat connector. Compare to OEM spec. Check for intermittent with wiggle test while watching live data.
  5. Signal check: Monitor sensor output or OCS data on scan tool while applying known weight (e.g., test weight or person) and observe expected change. If sensor is analog, measure voltage change; if digital, observe classification status change.
  6. Continuity: If no signal change, disconnect connector and test continuity/resistance of sensor elements and harness back to module. Look for opens, shorts, or high resistance.
  7. Isolate: If wiring and connectors are good, remove seat trim/cushion as required and inspect/bench-test the sensor mat. Replace sensor mat if element failure is confirmed.
  8. Module check: If sensor and wiring are good but fault persists and communications are normal, consider module fault. Confirm with OEM diagnostics before module replacement.
  9. Repair: Repair or replace damaged wiring, connectors, or sensor mat. Use OEM parts for OCS. Reassemble and clear codes.
  10. Verify: Re-enable SRS, perform full system checks, verify live OCS status and that the airbag lamp is extinguished and passenger classification behaves correctly during test.

Likely causes

  • Damaged/loose connector at the passenger seat sensor or module
  • Broken wire or short in wiring harness under the seat due to movement
  • Failed seat mat/sensor element from water ingress or mechanical damage

Fault status

⚠️ Status
Occupant classification sensor circuit fault detected for passenger seat. Fault stored in SRS/OCS module; may be current or intermittent. Airbag/passenger classification may be inhibited or report incorrect status.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B2949 B2950 B1650 U0121 U0231
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B2948

MITSUBISHI B — Body

Down latch RH open:close timeout

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in passenger seat occupant classification sensor harness
  • Corroded, loose or damaged connector at seat sensor or module
  • Faulty occupant classification sensor mat (pressure/weight sensors) in the passenger seat
  • Faulty occupant classification / airbag control module or internal electronics
  • Water intrusion or contamination in the seat cushion or connector
  • Aftermarket seat covers, seat heaters, or prior repairs interfering with sensor operation

Symptoms

  • Airbag warning lamp ON (SRS / Supplemental Restraint System)
  • Passenger airbag status may read OFF or Unknown on dash or infotainment
  • Passenger occupant detection incorrect (no occupant detected or incorrect weight class)
  • Stored/active diagnostic trouble code B2948
  • Intermittent changes in passenger airbag status when occupying or moving the seat

What to check

  • Read SRS/OCS module using a scan tool; record freeze frame and related codes
  • Visual inspection of passenger seat, connectors under seat, and wiring for damage, corrosion, or moisture
  • Verify seat covers / aftermarket items removed to rule out interference
  • Check for active communication with airbag/OCS module on CAN/LIN using scan tool
  • Perform basic power and ground checks at the seat sensor connector (with ignition ON per manufacturer procedure)
  • Move seat through its full travel and watch for intermittent faults or connector/wiring movement

Signal parameters

  • Reference supply to sensor: typically 5 V (±0.25 V) — verify per OEM specification
  • Sensor output: varies with load — expect a measurable change when weight is applied; typical 0–5 V analog or changing digital sensor data
  • Communication: module may report occupant classification over CAN or a dedicated serial bus — check for valid messages and live data
  • Continuity: power/ground circuits should show low resistance (near 0 Ω to tens of ohms) to ground/power rails; sensor element resistance will change when load applied
  • No short to battery voltage or ground on the sensor signal line(s)

Diagnostic algorithm

  1. Safety: Disable SRS per manufacturer procedure (battery disconnect and wait or use specified SRS disabling method).
  2. Scan tool: Connect a capable scan tool, read codes and freeze frame, note related SRS/OCS codes and module software level.
  3. Visual: Inspect passenger seat cushion, connectors beneath seat, wiring harness routing by seat rails for chafing, pin damage, water intrusion or corrosion. Check for aftermarket covers or heaters.
  4. Connectors: With ignition ON (if safe and per procedure), probe power (Vref) and ground at the sensor/mat connector. Compare to OEM spec. Check for intermittent with wiggle test while watching live data.
  5. Signal check: Monitor sensor output or OCS data on scan tool while applying known weight (e.g., test weight or person) and observe expected change. If sensor is analog, measure voltage change; if digital, observe classification status change.
  6. Continuity: If no signal change, disconnect connector and test continuity/resistance of sensor elements and harness back to module. Look for opens, shorts, or high resistance.
  7. Isolate: If wiring and connectors are good, remove seat trim/cushion as required and inspect/bench-test the sensor mat. Replace sensor mat if element failure is confirmed.
  8. Module check: If sensor and wiring are good but fault persists and communications are normal, consider module fault. Confirm with OEM diagnostics before module replacement.
  9. Repair: Repair or replace damaged wiring, connectors, or sensor mat. Use OEM parts for OCS. Reassemble and clear codes.
  10. Verify: Re-enable SRS, perform full system checks, verify live OCS status and that the airbag lamp is extinguished and passenger classification behaves correctly during test.

Likely causes

  • Damaged/loose connector at the passenger seat sensor or module
  • Broken wire or short in wiring harness under the seat due to movement
  • Failed seat mat/sensor element from water ingress or mechanical damage

Fault status

⚠️ Status
Occupant classification sensor circuit fault detected for passenger seat. Fault stored in SRS/OCS module; may be current or intermittent. Airbag/passenger classification may be inhibited or report incorrect status.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B2949 B2950 B1650 U0121 U0231
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .