What does it mean?
B1330 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Passenger Door Ajar Circuit Short To Ground .
Symptoms
- The system always shows the passenger door as open, even when it is firmly shut
- Interior lamps stay on and flatten the battery overnight
- The alarm will not arm, or triggers by itself
- Door ajar warning displayed permanently on the cluster
- Automatic door locking at speed does not operate
Likely causes
- Door ajar switch circuit grounded inside a water-damaged door latch
- Wire chafed against the door hinge or the door shell where the loom flexes
- Torn vapour barrier letting water run down onto the latch and its connector
- Corroded jamb connector bridging the signal wire to ground
- Latch internal switch stuck closed by old grease or corrosion
- Damage after door trim, window regulator or lock actuator replacement
- Body control module input stage failure
How to fix it
- Watch the passenger door ajar input in live data while opening and closing the door
- Unplug the door latch connector and see whether the input changes to closed, which points straight at the latch
- If the circuit stays grounded with the latch unplugged, check the harness inside the hinge boot for chafing
- Inspect the inside of the door for water intrusion and repair the vapour barrier
- Clean or replace corroded jamb connector terminals
- Replace the door latch assembly when its internal switch stays closed
- Clear codes, verify lamp and alarm behaviour, then recheck for parasitic drain