Diagnose

To check the faults in a car using a computerised tool.

In the context of technical service, particularly for automotive security, "diagnose" refers to the comprehensive, systematic process a specialist uses to identify the precise cause of a lock, key, or ignition malfunction before attempting any repair or replacement. It is the critical first step that separates a simple repair from a correct, permanent solution.

This step is essential because modern vehicles have complex, interconnected security systems where the apparent problem (e.g., the car not starting) may be caused by a completely separate underlying issue.

The process of diagnosis often involves:

1. Systematic Troubleshooting: This starts by ruling out the most common and simple issues. For instance, if the car key will not turn, the locksmith will check if the problem is a worn-out key (which can be fixed by "decutting" a new one to code) or actual damage inside the ignition cylinder.
2. Electronic System Scan: For newer vehicles, a locksmith must connect specialized diagnostic tools (like advanced OBD-II scanners) to the vehicle's onboard computer. This is used to read and clear any fault codes logged in the immobilizer, engine control unit (ECU), or body control module. This electronic scan reveals critical information, such as:
• Whether the transponder chip in the key is being correctly recognized by the vehicle.
• If a security system component, like an antenna ring or security module, has failed.
3. Mechanical Inspection: This involves physically inspecting the lock cylinders in the door and ignition for visible damage, broken key fragments, or signs of tampering or excessive wear.

The ultimate goal of the "diagnose" phase is to correctly pinpoint whether the customer's issue requires a key cutting service, key programming (electronic synchronization), lock repair, or the replacement of a complex electronic module, thereby ensuring the most efficient and cost-effective repair.