Code
B0080
HUMMER
B — Body
Discard Left Front/Driver SIS
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in the sensor wiring or connector
- Corroded or damaged sensor connector or pins
- Failed/defective left front (driver) side impact sensor)
- Water intrusion or physical damage at the sensor or harness
- SIR/airbag module software or internal fault
- Improper repairs or incorrect replacement sensor (wrong part or orientation)
Symptoms
- Airbag/SRS warning lamp illuminated
- Side airbag or seat belt pretensioner may be disabled for the driver side
- Related SRS DTCs stored in the restraint control module
- Possible diagnostic trouble codes on CAN/SIR networks
What to check
- Read and record all SRS DTCs and freeze frame data with a capable scan tool
- Verify vehicle battery voltage and good ground before testing
- Visually inspect left front sensor, mounting, and wiring harness for damage, corrosion, or water intrusion
- Inspect connector pins for bent, pushed out, corroded, or backed-out terminals
- Check for related codes that can indicate harness or module faults
- Follow SRS safety procedures (battery disconnect and specified wait time) before disconnecting sensors
Signal parameters
- With ignition ON, scan tool should show presence/heartbeat of left front SIS message (if CAN/digital); otherwise sensor should report a steady/resting value
- At rest a lateral accelerometer often reads ~0 g (near midpoint voltage) — check live data for erratic or out-of-range readings
- If the sensor is passive, expected continuity to module and specified resistance per factory data (measure with service manual specs)
- Check for stable 5 V reference or power/ground (for active sensors) — present and within specified limits
- Look for intermittent opens or shorts when flexing harness (wiggle test while monitoring live data)
Diagnostic algorithm
- Use a scan tool to read all stored SRS codes, freeze frame and live data. Note related codes and any historical collision events.
- Confirm battery voltage is within range; some SRS systems will set faults when supply voltage is low.
- Visually inspect the left front SIS, mounting bracket, and wiring harness. Look for water, corrosion, impact damage, or aftermarket modifications.
- With SRS safety precautions (disconnect battery and wait specified time), unplug the sensor connector and inspect pins for corrosion, damage, or deformation. Repair or replace connector as needed.
- Perform continuity and resistance checks between the sensor connector and airbag control module per factory wiring diagram. Repair any opens/shorts.
- Reconnect and power up; monitor live sensor data (or CAN message) for valid values. Wiggle the harness while watching live data for intermittent faults.
- If wiring checks good but sensor data is out of range or missing, replace the left front SIS with an OEM-correct unit. Ensure correct orientation and secure mounting.
- After repair, clear codes and run SRS system self-tests with the scan tool. Verify the airbag lamp extinguishes and DTC does not return.
- If the DTC returns after replacing sensor and repairing harness, test/verify the restraint control module and its software level; consider module reprogramming or replacement per manufacturer guidance.
- Always follow the vehicle manufacturer’s SIR/airbag handling and disposal procedures when replacing components.
Likely causes
- Corroded connector at sensor causing intermittent signal or high resistance
- Sensor damaged by collision or impact
- Harness chafed/shorted near door or A-pillar
- Sensor not programmed or incompatible after replacement
- Ground or power supply issue to the sensor (if it is an active/powered sensor)
Fault status
Status
SRS control module has discarded the left front (driver) side impact sensor input. The sensor data is not being used for airbag deployment decisions. Inspection of sensor, connector, and wiring is required; driver-side side-impact protection may be impaired until repaired.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Repair manuals
Manual library for HUMMER
138
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