What does it mean?
B1452 is a Body (airbags, seat belts, body electronics) fault code. It indicates: SIS (Side Impact Sensor) Rear-Driver Circuit Short to Battery .
Symptoms
- Airbag/SRS warning lamp permanently on
- Driver-side side and curtain airbag protection is switched off by the control unit
- Other body electrics sharing the damaged loom section may misbehave at the same time
- Fault typically appears after accessory fitting, accident repair or rear-end bodywork
- Code sets again as soon as the ignition is switched on
Likely causes
- Sensor wire chafed against a powered circuit routed in the same loom, such as a lamp, window or lock feed
- Incorrect repair: the sensor line spliced or tapped into a switched or permanent power wire
- Corrosion or water in a multi-pin connector bridging the sensor pin to a live pin
- Aftermarket accessory wiring pushed into the SRS loom in the rear quarter or under the seat
- Wrong or non-matching sensor fitted after a repair
- Damaged airbag control unit input stage holding the line high
How to fix it
- Read all SRS codes and note any other codes from the same loom branch
- De-energise the system: ignition off, battery disconnected, prescribed wait time observed
- Unplug the sensor, then reconnect the battery and carefully measure for voltage on the sensor circuit pins in the harness; any battery voltage there proves a short to power
- Switch the ignition on and off and check whether the voltage is permanent or switched, which tells you which circuit is feeding it
- Open the sill and rear quarter trim and inspect for melted insulation, chafe against a powered wire and any added or spliced wiring
- Remove non-factory taps and repair the damaged section with proper insulation and routing
- If the harness reads clean, back-probe at the airbag control unit and, only then, consider the module
- Clear the codes, cycle the ignition several times and confirm the warning lamp stays out