[autojoe]

the passkey module is not reprogrammable,like other modules.Whenever the module needs replaced or ignition key and tumblers have been replaced,a new virgin anti-theft module will be needed.once an anti-theft pass key module has learned a specific ignition key value it cannot be re written.
A new passkey module is already in a state called registration mode.when you install this virgin module it is ready to learn the new key ohmic value.
after installing a new passkey module,turn the key to the koeo position for 5 seconds and then after 5 seconds proceed to the crank mode.the engine should start.if the engine does not crank,note the security light.if the security light comes on for 5 seconds and then goes out the passkey module is reading the proper key value.suspect a bad starter enable relay or a convential starter circuit problem.if the security light stays on a fault has been detected.retrieve codes with a scan tool.
Get one from dealer and make sure box is not open.

TDM looks for learned voltage drop on one of the white wires from the key resistor pellet in the key.one wire out from tdm to key will have 5 volts and other will return a learned voltage drop value from key to tdm.disconnect the connector from the tdm and check resistance of these 2 wires with key in the ignition.now measure the ohmic value of the key resistor pellet outside the cylinder.the value of the resistance should vary 5-10 ohms.also wiggle key and turn steering wheel while key is in the cylinder while observing the ohmmeter to check contacts in the key cylinder.Should be steady value.usually a flashing light on a passkey2 system is an open in one of the 2 or both wires that run from key cylinder to tdm or dirty contacts or faulty key.hope this helps......do resistance tests above.Joe