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Home >> Chevrolet >> 1996 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Data Link Communications System >> Trouble Shooting >> Serial Data Lines

Serial Data Lines

  1. Ensure there is proper connection between scan tool and DLC and no loose or missing DLC terminals.
  2. If PCM/VCM is not accessible with a scan tool, check for an open in circuit 1807 between DLC terminal No. 2 and PCM/VCM. See Figure and Figure .
  3. If BPMV is not accessible with a scan tool, check for an open in circuit 799 between DLC terminal No. 12 and BPMV. See Figure and Figure .
  4. If DERM is not accessible with a scan tool, check for an open in circuit 800 between DLC terminal No. 9 and DERM. See Figure and Figure .
  5. If TCCM is not accessible with a scan tool, check for an open in circuit 1568 between DLC terminal No. 13 and TCCM. See Figure and Figure .
  6. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded and should be checked by monitoring the voltage drop with the system under load.
  7. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found, go to SYSTEM TESTS  .
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