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Intermittent Open/Short Circuit Check

  1. Wiggle suspected PASS-Key system wiring harness. This will set a fault Code ED58 (Eldorado and Seville) or PO58 (Riviera) in PCM if problem is detected in fuel enable circuit. Check for history fault codes in PCM. If a PASS-Key history code is present, check for intermittent wiring or contacts in fuel enable circuit. See appropriate G - TEST W/CODES article in the ENGINE PERFORMANCE Section.
  2. Check module power and ground circuits while wiggling harness. SECURITY indicator will light and remain on while a problem is detected in key resistance circuits, and will turn off if fault goes away. SECURITY indicator will light for a 5 second bulb check if ground or battery inputs are intermittent. Loss of battery input is not a possibility since internally the decoder module will use ignition input for power if battery is lost.
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