Manufacturer-specific body code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

B1352 (ignition key illumination circuit) on older F-150s is typically a burnt-out key cylinder halo light or a broken wire in the steering column. The fix is usually replacing the small illumination bulb inside the lock cylinder bezel -- about $10. If the bulb is fine, check the wire running down the steering column from the BCM. A broken wire at the column tilt joint is common after many years of tilt adjustments.

Mustang B1352 commonly appears after the steering column was disassembled for clockspring or tilt-lever work. The key illumination connector is easy to miss when reassembling. Remove the lower column shroud, locate the two-pin connector near the ignition lock, and reseat it. If the bulb itself is dead, replace it -- the halo light around the key is a standard T1 incandescent.

Expedition B1352 is usually a failed ignition key halo bulb. The bulb is cheap but accessing it requires removing the steering column shrouds. Disconnect the battery, remove the lower and upper shrouds (three screws plus two trim clips), pop out the bulb holder, and replace. Clear the code with a scan tool -- some Fords latch B1352 and will not self-clear.