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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the operation of the defogger grid while pressing the rear defogger switch. The defogger grid should ACTIVATE and DEACTIVATE when changing between commanded states.
  2. Ignition ON, observe the operation of the defogger indicator while pressing the rear defogger switch. The defogger indicator should turn ON and OFF when changing between the commanded states.
    • If the defogger indicator does not illuminate or continuously illuminates, replace the HVAC control module.
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