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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 24, Courtesy Light Relay Coil Shorted To Battery Or CCM Internal Open >> Testing
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DTC 24, Courtesy Light Relay Coil Shorted To Battery Or CCM Internal Open: Testing

  1. Cover ambient light sensor on Driver Information Center (DIC) with dark tape to simulate darkness. Turn ignition switch to OFF position. Remove courtesy light relay. Connect a test light between courtesy light relay connector terminal E1 and ground. Turn ignition switch to ON position. If test light illuminates, repair short to battery in courtesy light control circuit. If test light does not illuminate, go to next step.
  2. Using DVOM, measure resistance between courtesy light relay terminals E2 and E1. If resistance is not 50-80 ohms, replace relay and go to next step. If resistance is 50-80 ohms, go to next step.
  3. Using DVOM, check for continuity between courtesy light relay terminals E3 and E1. If continuity is present, replace relay and go to next step. If continuity is not present, go to next step.
  4. Connect a test light between battery voltage and courtesy light relay connector terminal E1. 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 "1.4" displays on trip monitor. Press ENG/MET (next value) button on DIC until "10...0" displays on trip monitor. Display will cycle between "10...0" (off) and "10...1" (on). If test light illuminates when "10...1" is displayed, go to next step. If test light does not illuminate when "10...1" is displayed, go to step 6).
  5. No problem is present. 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. When a short to battery is present in courtesy light control circuit, courtesy and cargo area lights will not illuminate as intended.
  6. Check for open in courtesy light control circuit or for poor connections at CCM. If circuit and connections are okay, replace CCM.
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