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Preliminary Checks

  1. Check fuses in interior fuse panel and maxi-fuses in underhood power distribution box. Replace as necessary. Visually inspect wiring harness for obvious signs of damage.
    NOTE: Left front window must be in full up position while performing self-diagnostics.
  2. If concern remains after checking fuses and wiring harness, perform self-diagnostics on the Generic Electronic Module (GEM). Self-diagnostics are carried out using Rotunda New Generation Star (NGS) tester. See MODULE COMMUNICATIONS NETWORK article for further information.
  3. If self-diagnostics is completed and no Diagnostic Trouble Codes (DTCs) are retrieved, continue with TROUBLE SHOOTING, then go to appropriate symptom related test (if necessary). If self-diagnostics is completed and DTCs are retrieved, go to appropriate DTC test in this article. If a DTC is retrieved from GEM and the correct test is not in this article, refer to DTC chart for GEM in MODULE COMMUNICATIONS NETWORK article for a brief explanation of DTC. The DTC chart should direct you to correct article to find testing procedure.
  4. If a communication problem exists with GEM, go to NO COMMUNICATION WITH GEM test. Also, see MODULE COMMUNICATIONS NETWORK article for data bus diagnostics and repair procedures.
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