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Preliminary Check

  1. Using scan tool, attempt to establish communication with door control modules. If communication is not successful, repair serial data link fault first. See WIRING DIAGRAMS  . If communication with modules is successful, retrieve all Diagnostic Trouble Codes (DTCs). Perform necessary repairs if DTCs exist. See DTC DEFINITIONS  table under SELF-DIAGNOSTICS.
  2. If both windows are inoperative from left switch, Check fuses No. 30, 31, 33 and 34. Replace as necessary.
  3. If windows move slowly, ensure battery is fully charged, terminal contact and ground connections are okay. Ground points are located behind left and right kick panels. Check window regulator lubrication. Ensure aftermarket equipment is properly installed.
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