System Intermittents - PASS-Key II

NOTES ON INTERMITTENTS
The most likely causes of intermittent no start no crank complaints due to the PASS-Key II System are either an incorrect resistance measurement or an intermittent relay.

Incorrect resistance measurements checks:
^ Ask if it happens with only one key and not the others. If so, clean or replace the faulty key.
^ If condition is present with all keys, indications are that the lock cylinder is dirty/defective or there is a fault in the key resistance circuit wiring, connections, or contacts.
^ A method for checking the key resistance circuit with an ohmmeter is as follows:
1.) Measure resistance across key contacts while removed from vehicle.
2.) Disconnect the PASS-Key II decoder module, insert key in ignition, measure resistance across B7 and B8 of the decoder module harness connector. Manipulate the harness while performing this test. The resistance should be within 10 ohms of the resistance measured on the key when it was removed from the vehicle. If the resistance is not within 10 ohms, determine if the resistance difference is the wiring, wiring connections, dirty key/lock cylinder contacts, or a defective lock cylinder.
3.) Rotate key throughout all positions and monitor for a resistance change. A change of over 10 ohms indicates a problem with the lock cylinder or key contacts.

Intermittent relay checks:
^ Ask if the security indicator comes on for 5 seconds and then goes OFF. If so, the relay is most likely the problem. Check connections to relay, if OK, install a new relay.
^ Ask if the security indicator remains ON past the 5 second bulb check when the vehicle will not crank. If the security indicator is ON, the relay is not the problem.
^ Ask if the symptom is have to turn key to crank position several times successively before engine will crank, this symptom leads to an intermittent relay. Check connections to relay, of OK, install a new relay.
^ Ask if the vehicle could be started immediately after the fault. If it could not, the relay is not the problem.

Start vehicle and check for intermittent wiring connections by moving the associated PASS-Key II system wiring harnesses around.
^ This will set a PASS-Key II fault Code ED58 in the PCM if problem is detected in fuel enable circuit.
^ Check PASS-Key II history fault code in the PCM. If a PASS-Key II history code is present, check for intermittent wiring or contacts in the fuel enable circuit.
^ Check power and ground to the module while manipulating the harness.
^ The security indicator will illuminate and remain ON while a problem is detected in the key resistance circuits and will turn OFF if the fault goes away.
^ The security indicator will illuminate for a 5 second bulb check if the ground or battery inputs are intermittent. A loss of the battery input is not a possibility since internally the decoder module will use the ignition input for power if battery is lost.

Some other areas to check include the following:
^ Inspect PASS-Key II decoder module harness connector at base of steering column, wiring and terminals for tightness/damage or corrosion and the positive lock mechanism. inspect the decoder module connector for bent pins.
^ Inspect starter relay for proper lock mechanism and connections.
^ Lightly tapping the decoder module will determine if the module is intermittent. Data indicates that the problem for an intermittent is typically not the decoder module.
^ Thermal cycle starter enable relay and decoder module and reinstall in vehicle to induce fault.