Checking Components And Switches

• Switch off the engine.
• Check the heater in the lens by spraying on a thin layer of frost using freeze spray. Make sure that the mist disappears. Lens temperature should be 70 - 75 °C.
• Start the engine and check if the diodes on left and right side flash three times each.
• If any diode does not flash three times, check it.

  Check the diode by measuring the resistance across it or connect it to voltage and check that it lights up.

• If the diode does not work, replace it.
• If the diode works, check all relevant connectors.
• If the heater does not work, replace the rear-view mirror in question. If no fault is detected, replace rear-view mirror.

Other information: 

• see REAR VIEW MIRROR EXTERNAL

Fig 1: Identifying Driver's Side (Rear-View) Door Mirror And Blind Spot Camera

Courtesy of VOLVO CARS CORPORATION

• Continue 

  Refer to VERIFICATION