Review the system Description and Operation before you begin the diagnosis. Reviewing the Description and Operation will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation will also help you determine if the condition described by the customer is normal operation. Refer to Automatic Day-Night Mirror Description and Operation .

For the inside rearview mirror with the temperature display feature, refer to Symptoms - Stationary Windows in order to identify the correct procedure for diagnosing the system and where the procedure is located.