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Function Test

NOTE:
  • Before testing, check the No. 10 (7.5 A), No. 59 (40 A [30 A]), and No. 60 (IGN) (50 A) fuse in the under-dash fuse/relay box.

    • []: Without power mirror defogger

  • Be careful not to scratch or damage the defogger wires with the tester probe.
  1. Turn the ignition switch to ON (II), then turn the rear window defogger switch ON.
  2. Measure the voltage between the positive terminal (A) and body ground. There should be battery voltage.
    • If there is no voltage, check for:
      • Faulty rear window defogger relay, (see POWER RELAY TEST )
      • Faulty climate control unit.
      • An open in the RED [BLU] wire to the positive terminal.

        []: Without power mirror defogger

    • If there is battery voltage, go to step 3.
    Fig 1: Identifying Positive Terminal And Negative Terminal
    G06431758Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Measure the voltage between the negative terminal (B) and body ground. There should be less than 0.2 V.
    • If there is less than 0.2 V, go to step 4.
    • If there is more than 0.2 V, check for:
      • Open or high resistance in the wire.
      • Poor ground (G801).
  4. Touch the voltmeter positive probe to each point on each defogger wire, and the negative prove to the negative terminal.
    • If the voltage is as specified, the defogger wire up to that point is OK.
    • If the voltage is not as specified, repair the defogger wire.
      • If it is more than specified at one of the points, there is a break in the negative half of the wire.
      • If it is less than specified at one of the points, there is a break in the positive half of the wire.
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