F2: Check Circuit Logic At Switch Connector

Using a Voltage Multimeter, verify circuit logic at switch connector. See WIRING DIAGRAMS  . Is circuit logic OK at outside rear view mirror control? If yes, trace along outside mirror control wiring to determine where cross circuitry took place, see Fig 1 . Service as required. If no, replace outside rear view mirror control and retest mirror operation.

Fig 1: Identifying Circuit Logic At Switch Control

Courtesy of FORD MOTOR CO.