B00B4

Code

Generic B — Body

Driver Seat Occupant Classification Sensor E

Brand: Generic

Type: B — Body

Views: UK: 22 EN: 26 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in sensor E wiring (to ground or battery)
Corroded, loose or disconnected connector at the sensor or SRS module
Water intrusion, contamination or damage to the sensor mat/pad
Failed occupant classification sensor element (sensor pad/module)
Faulty SRS/airbag control module or internal fault
Incorrect or missing sensor calibration/relearn after repair

Symptoms

SRS / Airbag warning lamp illuminated
Passenger/driver airbag or seatbelt reminder behavior changed (airbag disabled for seat)
Stored B00B4 code (may be accompanied by related occupant classification codes)
Intermittent warning lamp or codes after seat movement or occupant repositioning
Possible inability to complete occupant classification sensor calibration

What to check

Retrieve DTCs and freeze-frame data with an appropriate scan tool; note any related codes
Confirm current occupant classification status and live data for sensor elements using scan tool
Visually inspect seat cushion, connectors, and wiring harness for damage, corrosion or contamination
Check for presence of moisture or foreign material in seat cushion/sensor area
Measure reference voltage and signal voltage at sensor connector with ignition ON (follow manufacturer safety procedures)
Perform continuity/resistance checks of sensor element wiring to identify opens/shorts

Signal parameters

Sensor supply/reference voltage: typically ~5 V (verify exact value per manufacturer)
Sensor signal voltage varies with load/occupancy (changes expected when weight applied/removed)
A functional sensor element shows a change in resistance/voltage with applied force; an open circuit appears as very high/infinite resistance
Short-circuit to ground or battery will show near 0 V or battery voltage on the signal line respectively
CAN/LIN messaging (if used) should show valid occupant classification messages from SRS module — corrupted or missing messages indicate communications issue

Diagnostic algorithm

Read and record all fault codes and freeze frame data. Check for related occupant classification or SRS codes.
Follow manufacturer procedures to disable the battery (disconnect and wait specified time) before inspecting or disconnecting SRS connectors to avoid accidental deployment.
Visually inspect the seat cushion, sensor mat, connector and wiring for damage, liquid contamination, corrosion, pin deformation or foreign objects.
Reconnect battery per procedure, power the ignition and use scan tool to view live data for sensor E. Note behavior while adding/removing weight on the seat element.
If live data is static or abnormal, with ignition ON measure reference voltage and signal at the sensor connector. Compare to expected values and watch while applying load and moving wiring.
Perform continuity/resistance checks from the sensor connector to the SRS module to locate opens or shorts. Repair wiring or connector faults found.
If wiring and connectors are good but sensor element does not respond correctly, remove seat cushion and test/inspect sensor mat. Replace sensor mat if internal element E is failed or contaminated.
After repair or replacement, perform required occupant classification sensor calibration/relearn using appropriate scan tool and manufacturer procedure.
Clear codes and verify that the SRS warning lamp extinguishes and that the system reports normal occupant classification operation. Road test and re-check for recurrence.
If fault persists after sensor/harness replacement and successful calibration, consider SRS control module diagnosis or replacement per manufacturer guidance.

Likely causes

Connector at seat sensor E is loose, pin backed out, or corroded
Sensor mat element E is open (broken trace) or shorted to adjacent element
Moisture or spilled liquid in seat cushion causing intermittent readings
Sensor wiring harness pinched or damaged where it passes through seat frame
Sensor module failure (internal electronics fault)
SRS control module fault or missing/incorrect calibration data

Fault status

⚠️ Status

Occupant classification sensor E circuit fault — electrical malfunction or implausible signal detected. May disable occupant classification for that seat and set SRS/Airbag warning lamp.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours