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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis (Single Page) >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Component Testing >> Relay Test
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Relay Test

  1. Ignition OFF, disconnect the RR DEFOG relay.
  2. Test for 60-180 ohms between terminals 85 and 86.
    • If not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 95
    • 85 and 87
    • If not the specified value, replace the relay.
  4. Install a 5A fused jumper wire between the relay terminal 85 and B+. Install a jumper wire between the relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
    • If greater than the specified range, replace the relay.