If the front doors lock but the rear doors remain openable, verify the actual security of the vehicle rather than relying on a flash or sound. Door-group settings and faults need distinguishing.
Compare each normal locking route
Record remote, cab-switch and manual behaviour according to the manual. Include recent latch or body repairs and whether a door-open warning is present. Do not assume one confirmation signal proves every lock engaged.
Arrange repair and secure the vehicle appropriately while awaiting assessment. The technician should check requests, door status and local mechanisms. A clear door-by-door report is more useful than describing central locking as completely failed or replacing a BCM before the affected rear circuit is inspected.
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