What does it mean?
B2403 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Steering Lock Unit communication. (CRC) .
Symptoms
- The changer reports an error and refuses to play any disc
- Discs will not load or will not eject
- Grinding, clicking or repeated retry noises come from the unit
- The CD source disappears from the audio menu
- The unit works briefly after a battery disconnect and then fails again
Likely causes
- Mechanism jam with a disc stuck inside the transport
- Worn or dirty laser pickup that can no longer track a disc reliably
- Damaged loading gears or a perished drive belt inside the changer
- Foreign object, coin or a second disc pushed into the slot
- Electronic failure on the changer main board
- Water or damp damage from a boot or rear quarter leak where the changer is mounted
- Corrupted internal software after the supply was interrupted during operation
How to fix it
- Try a known good original disc first to rule out a scratched or copied disc as the cause
- Carry out the manufacturer forced eject or reset procedure to clear a jammed disc
- Inspect the slot for a second disc or a foreign object before applying power again
- Check the changer supply, ground and its dedicated fuse
- Disconnect the battery briefly to reset the unit, then retest and see whether the code returns
- Inspect the mounting area for water ingress and dry the unit thoroughly if moisture is found
- Replace or have the changer rebuilt once the mechanism or main board is confirmed faulty