DTC 53, Pass-Key(R) Key Detection CKT Open Or Shorted To Batt: 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 53 will set when ignition is on and voltage level sampled at CCM PASS-Key(R) input detects an open or short to battery 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. Other CCM-controlled circuits that use internal CCM ground include fuel gauge, DIC switches, ambient light sensor and dimming potentiometer. If any of these circuits malfunction or are inoperative, CCM internal ground is bad.

When DTC 53 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 an open or short to battery is present in 5-volt PASS -Key(R) input circuit, vehicle will exhibit a no-crank condition.
• If a short to battery is present in PASS-Key(R) ground circuit, vehicle will exhibit a no-crank condition.