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Home >> Buick >> 1992 >> Roadmaster Limited >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Heated Glass/Defoggers >> Defogger - Rear Window >> Testing >> System Check >> With Automatic A/C

With Automatic A/C

  1. If both mirror defoggers are inoperative but rear defogger is okay, see Fig 3 . If one mirror defogger is inoperative and other mirror defogger is operative or if rear defogger is inoperative and mirror defoggers are okay, see Fig 4 and Fig 5 . If rear defogger and mirror defoggers (if equipped) are inoperative, see Fig 6 .
  2. If indicator is inoperative but rear defogger grid and mirror defoggers are okay, replace electric A/C control head. If rear defogger grid and indicator will not cycle on or off for 10 minutes on first use and 5 minutes for subsequent use, replace electric A/C control head.
Fig 1: "B" Body System Diagnosis (Chart 1 of 6)
G91C11496Courtesy of GENERAL MOTORS CORP.
Fig 2: "B" Body System Diagnosis (Chart 2 of 6)
G91D11497Courtesy of GENERAL MOTORS CORP.
Fig 3: "B" Body System Diagnosis (Chart 3 of 6)
G91E11498Courtesy of GENERAL MOTORS CORP.
Fig 4: "B" Body System Diagnosis (Chart 4 of 6)
G91F11499Courtesy of GENERAL MOTORS CORP.
Fig 5: "B" Body System Diagnosis (Chart 5 of 6)
G91I11500Courtesy of GENERAL MOTORS CORP.
Fig 6: "B" Body System Diagnosis (Chart 6 of 6)
G91J11501Courtesy of GENERAL MOTORS CORP.
Fig 7: "B" Body Defogger Wiring Schematic (With Automatic A/C)
G91A11502Courtesy of GENERAL MOTORS CORP.
Fig 8: "B" Body Defogger Wiring Schematic (With Manual A/C)
G91B11503Courtesy of GENERAL MOTORS CORP.
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