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Home >> Pontiac >> 1996 >> Grand Prix Base >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Data Link Communications System >> Trouble Shooting >> Class 1 Serial Data Line
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Class 1 Serial Data Line

  1. If all components are not accessible with a scan tool, check for an open in circuit 800 between DLC terminal "M" and S237. See WIRING DIAGRAMS  .
  2. If a single component is not accessible with a scan tool, check for an open in circuit 800 between S237 and the component. Check circuit 1807 for an open between DLC terminal No. 2 and the PCM. Check C100 for a bad connection. Repair wiring as necessary. If no fault is found, go to SYMPTOM INDEX  table under SYSTEM TESTS.
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