System Intermittents

The most likely PASS-Key II system intermittent causes for no start, no crank complaints are either an incorrect resistance measurement or an intermittent relay.

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

Intermittent Relay Checks:
^ If "SECURITY indicator comes on for 5 seconds and then goes off, relay is most likely the problem. Check connections to relay, if OK, install a new relay.
^ if "SECURITY" indicator remains on past 5 second bulb check when vehicle does not crank, relay is not the problem.
^ If symptom is "have to turn key to crank position several times successively before engine cranks," an intermittent relay is the problem. Check connections to relay, if OK, install a new relay.
^ If vehicle could be started immediately after fault, relay is not the problem.

Start vehicle and check for intermittent wiring connections by moving associated PASS-Key II system wiring harnesses around:
^ This sets a PCM PASS-Key II fault (DTC P1626/P1629) if problem is detected in fuel enable circuit.
^ Check PCM for PASS-Key II history diagnostic trouble code. If a PASS-Key history diagnostic trouble code is present, check for intermittent wiring or contacts in fuel enable circuit.
^ Check power and ground wiring to PASS-Key II decoder module while manipulating harness.
^ The "SECURITY" indicator illuminates and remains on while a problem is detected in key resistance circuits and turns off if the fault goes away.
^ The "SECURITY indicator illuminates for a 5 second bulb check if ground or battery wiring inputs are intermittent. A loss of battery input is not a possibility since internally the PASS-Key II decoder module uses 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 positive lock mechanism. Inspect PASS-Key II decoder module connector for bent pins.
^ Inspect starter relay for proper Lock mechanism and connections.
^ Lightly tapping PASS-Key II decoder module determines if module is intermittent. Data indicates that problem for an intermittent is typically not the PASS-Key II decoder module.
^ Thermal cycle starter enable relay and PASS-Key II decoder module, and reinstall in vehicle to induce a possible heat related fault.