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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 34, Headlight Enable Circuit (Circuit Shorted To Battery) >> Testing
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DTC 34, Headlight Enable Circuit (Circuit Shorted To Battery): Testing

  1. Turn ignition switch to OFF position. Remove headlight relay. Turn ignition switch to RUN position. Using DVOM, measure voltage between headlight relay connector terminal E6 and ground. If voltage is not present, go to step 5). If voltage is present, go to next step.
  2. Turn ignition switch to OFF position. Disconnect headlight switch connector. Turn ignition switch to ON position. Using DVOM, measure voltage between headlight relay connector terminal E6 and ground. If voltage is not present, replace headlight switch. If voltage is present, go to next step.
  3. Turn ignition switch to OFF position. Disconnect RCDLR/TD module connector. Turn ignition switch to ON position. Using DVOM, measure voltage between headlight relay connector terminal E6 and ground. If voltage is not present, replace RCDLR/TD module. If voltage is present, go to next step.
  4. Check for short to battery in headlight enable circuit. If circuit is okay, 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.
  5. Turn ignition switch to OFF position. Using DVOM, check for continuity between headlight relay terminals E6 and D6. If continuity is present, replace relay. If continuity is not present, go to next step.
  6. Using DVOM, measure resistance between headlight relay terminals E6 and D6. Resistance should be 70-150 ohms. If resistance is not as specified, replace relay. If resistance is as specified, no problem is found. Problem may be intermittent. 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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