Code
B1207
LAND ROVER
B — Body
Collision entry with signal wire
Views:
UK: 7
EN: 19
RU: 14
AI status
Completed
Completed
100%
Causes
- Actual collision / impact event recorded by the sensor circuit
- Short to voltage or short to ground on the collision signal wire
- Open or intermittent connection in the signal wiring or connector
- Corroded or damaged sensor connector or harness
- Faulty impact / collision sensor
- Poor module ground or power supply problem
Symptoms
- SRS / airbag warning lamp illuminated on dash
- Stored collision-related fault code(s) and freeze-frame data
- Possible disablement of airbag deployment logic or other restraint functions until serviced
- Possible diagnostic trouble related to other body systems if wiring shared
- Vehicle may show history of a triggered crash event in module data
What to check
- Read full module fault list and freeze-frame / event data with a capable diagnostic tool
- Visually inspect collision/impact sensor(s), harnesses and connectors for damage, corrosion or pin damage
- Check related fuses, battery voltage and ignition supply to the restraint/body module
- Check module and sensor grounds for corrosion, tightness and continuity
- Scan other modules for related errors (CAN/BUS errors or other B-codes)
- Confirm whether a genuine collision/airbag deployment occurred before further tests
Signal parameters
- Normal idle: collision input typically rests at a defined state (manufacturer-specific) — often a steady voltage (e.g., ~0–5 V logic level) or open circuit; check service manual for exact level
- Triggered event: short pulse, change of voltage or switch closure consistent with impact sensor output
- Fault types to watch: unexpected permanent high/low voltage, intermittent pulses with no impact, or open-circuit/very high resistance
- CAN/bus: module should be awake and communicating when powered; loss of communication can accompany this code
Diagnostic algorithm
- Retrieve all related trouble codes and freeze-frame/event data from the restraint/body module using a manufacturer-capable scanner; note timestamps and vehicle conditions.
- Confirm whether a real collision or airbag deployment has occurred. If deployment present, follow manufacturer procedures for post-collision repair, replacement of deployed components and module reset.
- With ignition off and battery stable, visually inspect the impact sensor(s), mounting, wiring harness and connectors for physical damage, corrosion or recent repair work.
- Check fuses and battery/ignition power feeds to the restraint/body control module and ensure proper battery voltage during testing.
- Perform a continuity and resistance check of the collision signal wire between the sensor and the module connector; look for shorts to ground or battery and for intermittent connections (wiggle test).
- Inspect and test module and sensor grounds for low resistance to chassis ground.
- If wiring and connectors check OK, use an oscilloscope or diagnostic tool to monitor the collision input while performing controlled tests per service manual to look for false triggers (observe safety precautions).
- If the sensor is suspected, replace or bench-test per OEM procedure; if replacement needed, ensure correct sensor type and calibration as required.
- Check for module software updates or technical service bulletins; reprogram or replace the control module only if supported by diagnostics.
- After repairs, clear codes and re-test vehicle. Verify that the SRS lamp goes out and no further B1207 or related codes return. If codes persist, escalate to module replacement or manufacturer support.
Likely causes
- Damaged or chafed collision signal wire (short/ intermittent)
- Corroded connector at the collision sensor or control module
- Faulty collision/impact sensor stuck or producing false trigger
- Blown fuse or poor battery/ignition supply to the module
- Poor ground at the body/airbag/resraint module
Fault status
Status
Collision input signal detected on designated wire — restraint/body control module recorded an unexpected collision trigger or fault on the collision input circuit (B1207). Check sensor, wiring and module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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