DTC 52, Pass-Key(R) Key Detection Circuit Shorted: Notes

PASS-Key(R) detection circuit is completed when ignition key with embedded resistor pellet is inserted into ignition lock cylinder. When contacts in ignition lock cylinder mate with contact on pellet, CCM compares resistance value of key pellet to valid resistance programmed into CCM.

DTC 52 will set when ignition is on and voltage level sampled at CCM PASS-Key(R) input detects a short circuit at CCM PASS-Key(R) input circuit. Ensure key resistor contacts are clean and free from grease, oil, etc. Any contamination on contacts could cause code to set.

When DTC 52 is set:

• SECURITY indicator will illuminate.
• Crank enable and FEDS enable system processing will be disabled.
• For a period of time, sampling of PASS-Key(R) resistance is disabled.
• UTD system will not disarm if system is armed.
• If a short to ground is present in 5-volt PASS-Key(R) input circuit, vehicle will exhibit a no-crank condition. DTC 52 will clear when ignition is on and short circuit is no longer detected at CCM PASS-Key(R) input circuit.