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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 37, DRL Enable Circuit (CKT Open Or Shorted To Ground) >> Testing
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DTC 37, DRL Enable Circuit (CKT Open Or Shorted To Ground): Testing

  1. Turn ignition switch to OFF position. Remove DRL relay. Turn ignition switch to RUN position. Using DVOM, measure voltage between DRL relay connector terminal C2 and ground. If voltage is present, go to next step. If voltage is not present, repair open or short to ground in circuit between DRL relay, headlight relay and HDLTS circuit breaker No. 5 located in instrument panel fuse block; or in circuit between HDLTS circuit breaker No. 5 and maxi-fuse No. 11 located in underhood fuse block. Also, check maxi-fuse No. 11.
  2. Turn ignition switch to OFF position. Using DVOM, measure resistance between DRL relay terminals C2 and A1. Resistance should be 70-150 ohms. If resistance is not as specified, replace relay. If resistance is as specified, go to next step.
  3. Using DVOM, check for continuity between DRL relay terminals A1 and A2. If continuity is present, replace relay. If continuity is not present, go to next step.
  4. Disconnect CCM connector C1. Using DVOM, check for continuity between CCM connector C1 terminal A3 and ground. If continuity is present, repair short to ground in DRL enable circuit. If continuity is not present, go to next step.
  5. Install DRL relay. Turn ignition switch to RUN position. Using DVOM, measure voltage between CCM connector C1 terminal A3 and ground. If voltage is not present, repair open in DRL enable circuit. If voltage is present, go to next step.
  6. 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. Also check if DTC 47 is set. If DTC 47 is set, an intermittent open, short to battery or short to ground may be present in Canada select circuit (CCM connector C1 terminal A8).
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