Here is a description of how it works - maybe it will be of help for you or your mechanic...
1. When the lock is turned to "ON", the lock is sending the resistance signal to the Theft Decoder Module (built into the IPC), but the module is not yet looking for it.
2. When the lock is turned to "START", the ignition switch grounds the "bulb check' wire to the IPC which activates a time window that the module expects to see the signal from the lock.
3. When the engine starts and the key is released to the "RUN" position, the lock resistance is sent to the module.
4. When the module is satisfied with the resistance from the lock (and the timing of its delivery...), the module then sends its password via the data bus to the PCM that all is OK and the vehicle keeps on running.
You may have caused a loose connection when replacing the illumination lamps.
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