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Home >> Chevrolet >> 1996 >> Corvette Base, 2D Convertible, 5.7 5 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Central Control Module >> Diagnosing & Repairing CCM DTCS >> DTC 53, Pass-Key(R) Key Detection CKT Open Or Shorted To Batt >> Testing
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DTC 53, Pass-Key(R) Key Detection CKT Open Or Shorted To Batt: Testing

  1. Turn ignition switch to OFF position. Connect a jumper wire between Data Link Connector (DLC) terminals No. 12 and 5. Turn ignition switch to ON position. Press TRIP/ODO (next test) button on DIC until "1.2" displays on trip monitor. Press ENG/MET (next value) button on DIC until "06xxx" displays on odometer, with the value of "xxx" being 0-255. Note the value of "xxx". If value of "xxx" is 226-255, go to step 4). If value of "xxx" is not 226-255, go to next step.
  2. Repeat step 1) while wiggling wiring and connectors, and key in ignition lock cylinder. Note the value of "xxx". If value of "xxx" is at any time 226-255, go to step 4). If value of "xxx" is not at any time 226-255, go to next step.
  3. No problem is present. Check for poor connections at CCM and ignition lock cylinder. Poor connections could cause an open, incorrect PASS-Key(R) resistance or an intermittent fault. If code is set as history, problem may be intermittent. Try to recreate fault while performing test by wiggling wiring and connectors. Check for poor connections at all connectors that may be causing intermittent condition.
    WARNING: Vehicle is equipped with air bag supplemental restraint system. When locating 2-pin ignition switch lock cylinder harness connector at base of steering column, DO NOT confuse connector with Yellow 2-pin air bag supplemental restraint system connector also located at base of steering column.
  4. Turn ignition switch to OFF position. Disconnect 2-pin ignition switch lock cylinder harness connector located at base of steering column. Using adapter from Terminal Test Adapter Kit (J 35616-A), connect DVOM between ignition switch lock cylinder harness connector terminal "B" (CCM side of connector) and ground. Turn ignition switch to ON position. Measure voltage. If voltage is about 5 volts, go to step 6). If voltage is greater than 5.5 volts, repair short to battery in 5-volt PASS-Key(R) input circuit. If voltage is zero volts, go to next step.
  5. Using adapter connected to DVOM, backprobe CCM Green connector, terminal E12 to ground and measure voltage. If voltage is 4.5-5.5 volts, repair open in 5-volt PASS-Key(R) input circuit. If voltage is zero volts, check for poor connections at CCM. If connections are okay, replace CCM.
  6. Using adapter connected to DVOM, check for short to battery between ignition switch lock cylinder harness connector terminal "A" (CCM side of connector) and ground. Repair short to battery in PASS-Key(R) ground circuit as necessary. If a short to battery is not present, go to next step.
  7. Turn ignition switch to OFF position. Using adapter connected to DVOM, check for continuity between ignition switch lock cylinder harness connector terminal "A" (CCM side of connector) and ground. If continuity is present, replace lock cylinder. If continuity is not present, check for open or poor connections in PASS-Key(R) ground circuit. If circuit and connections are okay, replace CCM.
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