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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the rearview mirror.
  2. Test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance.
  4. With the transmission in PARK, test for less than 0.5 volts between the backup lamp supply voltage circuit and ground.
    • If the voltage is greater than 0.6 volt, test the backup lamp supply voltage circuit for a short to voltage.
  5. With the transmission in REVERSE, test for greater than 11 volts between the backup lamp supply voltage circuit and ground.
    • If the voltage is not 12 volts, test the backup lamp supply voltage circuit for an open/high resistance.
  6. If all circuits test normal, replace the rearview mirror.
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