What does it mean?
B1458 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Side Impact Sensor (Rear: LH) (Squib) for Power Supply Circuit .
Symptoms
- Airbag/SRS warning lamp on and staying on
- Rear left side impact sensing and the airbag it arms are both taken out of service
- Several SRS codes from the same side often appear together, which is the clue that a shared feed is involved
- Fault can be intermittent, appearing with vibration, door slams or a loaded boot
- Code sets again shortly after being erased
Likely causes
- Short to ground on the supply branch, dragging the feed down for every device on it
- Open or corroded connection at the branch splice or at an intermediate connector under the rear seat or sill
- Water in the connector after a door seal, drain or boot leak, raising resistance and leaking current
- Sensor or deployment loop drawing abnormal current because of an internal fault
- Loom crushed by a seat rail, trim fastener or luggage anchor on the rear left side
- Airbag control unit supply driver damaged, often alongside other sensor supply codes
- Repair splice from earlier accident work that has corroded or loosened
How to fix it
- Retrieve all SRS codes; when several codes point at the same side, suspect the common supply first
- Power the system down: ignition off, battery disconnected, prescribed waiting time observed
- Disconnect the rear left sensor and inspect its connector and the loom seal for water, corrosion and heat damage
- Measure the resistance of the supply branch to ground with everything unplugged; a low reading proves a short on the branch
- Measure end-to-end resistance of the same wire to check for an open, then wiggle the loom under the sill and seat to expose an intermittent break
- Unplug one device at a time on the branch to see which one restores a normal reading
- Repair the loom or splice properly, protect it from the crush point that caused the damage, and dry or renew the connector seals
- Replace the sensor or module only after the feed measures correct, then clear the codes and confirm with several ignition cycles