Code
B0101
HUMMER
B — Body
Electronic Front End Sensor 1 Performance
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UK: 19
EN: 44
RU: 21
AI status
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Causes
- Failed or intermittently failing front-end impact sensor (electronic).
- Open, shorted or corroded wiring or connector at the sensor.
- Poor sensor ground or missing reference/supply voltage.
- Water, contamination, or physical damage to the sensor or mounting.
- Loose or damaged sensor mounting (misalignment after collision or repair).
- Faulty SRS/airbag control module or software/configuration error.
Symptoms
- SRS/airbag warning lamp illuminated on the instrument cluster.
- Possible deactivation of airbag deployment for affected zones.
- Diagnostic trouble code B0101 stored in SRS control module.
- Intermittent SRS warning if wiring or connector is intermittent.
What to check
- Use an appropriate scan tool to read SRS codes and freeze‑frame data; record related codes.
- Visually inspect the front-end sensor, mounting, and wiring for damage, corrosion, or water intrusion.
- Inspect and backprobe the sensor connector for secure pins and signs of corrosion or bent pins.
- With safety procedures in place (see diagnostic steps), verify sensor reference voltage, signal and ground at the connector.
- Perform a wiggle/strain test on the harness while monitoring for code changes or signal interruptions.
- Check for related codes in the SRS module that might indicate module or bus issues.
Signal parameters
- Sensor supply/reference voltage: confirm factory spec (many systems use a 5 V reference).
- Signal output: typically a low‑voltage analog or pulse/frequency signal — should be within manufacturer specified range (commonly 0–5 V or specific frequency range).
- Ground: low resistance to chassis ground (verify continuity).
- Some vehicles use a digital/diagnostic bus for smart sensors (LIN/CAN) — verify correct communication if applicable.
- Always confirm exact voltage/resistance/frequency values against the HUMMER service manual for the specific model.
Diagnostic algorithm
- Safety first: follow SRS safety procedures — disable the battery per manufacturer instructions and wait the recommended time before touching SRS components.
- Connect a diagnostic scan tool with SRS capability. Read and record B0101 and any other SRS or network codes and freeze‑frame data.
- Perform a visual inspection of the front-end sensor and harness for damage, loose mounts, signs of crash repair, or water contamination.
- Reconnect battery per procedure if needed for live testing. Backprobe the sensor connector and verify reference supply voltage, signal output, and ground with a multimeter/oscilloscope while following all safety rules.
- Wiggle the wiring and connector while watching live data for intermittent faults. Inspect connector pins for corrosion or looseness.
- If wiring/power/ground are OK but signal is out of range or missing, replace the front-end sensor with a known-good unit or OEM replacement.
- After replacement, clear codes and perform SRS system self-tests. Re-check for any remaining or returning codes.
- If the fault persists with a known-good sensor, inspect/repair wiring back to the SRS module, and verify the SRS module connector and grounds. Consider module diagnostic/repair only after all sensor and wiring faults are ruled out.
- If repairs were performed, ensure proper sensor mounting and any required calibration or learning procedures are completed per the service manual.
- Final verification: perform a full SRS system scan and drive/ignition cycles to confirm the warning lamp remains off and no B0101 reappears.
Likely causes
- Corroded/poor connector or pinback at the sensor harness.
- Sensor electrical failure (internal fault).
- Damaged wiring between sensor and SRS module (chafe, crushed, short).
- Sensor physically damaged or incorrectly installed after repair.
Fault status
Status
Front End Sensor 1 performance fault detected. Check sensor, connector, wiring and SRS module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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