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Home >> Cadillac >> 1996 >> Fleetwood Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Central Control Module >> Diagnosing & Repairing CCM DTCS >> DTC 23, DIL Enable Circuit (CKT Open Or Shorted To Ground) >> Testing
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DTC 23, DIL Enable Circuit (CKT Open Or Shorted To Ground): Testing

  1. Turn ignition switch to OFF position. Remove DIL relay. Using DVOM, measure voltage between DIL relay connector terminal B4 and ground. If battery voltage is present, go to step 3). If battery voltage is not present, go to next step.
  2. Check DIL fuse No. 27 located in instrument panel fuse block. If fuse is okay, check for poor connections or open in DIL fuse No. 27 circuit between fuse and relay. If connections and circuit are okay, repair open in power supply circuit between fuse and battery power. If fuse is blown, repair short to ground in DIL fuse No. 27 circuit between fuse and relay, or in DIL supply circuit between relay and DIL-controlled components.
  3. Using DVOM, measure resistance between DIL relay terminals C6 and B4. Resistance should be 70-150 ohms. If resistance is not as specified, replace relay. If resistance is as specified, go to next step.
  4. Using DVOM, check for continuity between DIL relay terminals C6 and B4. If continuity is present, replace relay. If continuity is not present, go to next step.
  5. Turn ignition switch to OFF position. Disconnect CCM connector C1. Using DVOM, check for continuity between CCM connector C1 terminal A7 and ground. If continuity is present, repair short to ground in delayed interior lights enable circuit. If continuity is not present, go to next step.
  6. Install DIL relay. Turn ignition switch to RUN position. Using DVOM, measure voltage between CCM connector C1 terminal A7 and ground. If battery voltage is not present, repair open in delayed interior lights enable circuit. If battery voltage is present, go to next step.
  7. Turn ignition switch to OFF position. Check for poor connections at CCM connector. If connections are okay, reconnect CCM connector and all other components. Clear DTCs and check if DTC resets. If DTC resets, replace CCM. If DTC does not reset, 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.
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