Rear View Mirror: Overview Ford Taurus VI

Principles of Operation

Adjusting the exterior mirror switch to the LH or RH position determines which exterior mirror motor will be controlled. The Driver Door Module (DDM) receives input from the exterior mirror control switch and controls the movement of the LH exterior mirror motor. The RH exterior mirror motor is controlled by the Driver Seat Module (DSM). When the exterior mirror control switch is activated for the LH mirror, the DDM receives an input signal and then applies voltage and ground to the LH exterior mirror motor to move the exterior mirror motor to the desired position. When the exterior mirror control switch is activated for the RH mirror, the DDM receives an input signal and then sends a Medium Speed Controller Area Network (MS-CAN) message to the DSM . The DSM will then apply voltage and ground to the RH exterior mirror motor to move the exterior mirror motor to the desired position.

The exterior mirrors use a jumper harness between the vehicle wire harness connector and the exterior mirror motor. The exterior mirror jumper harness is integral to the exterior mirror. Before replacing an exterior mirror or mirror motor, inspect the jumper harness for open and shorted circuits or damaged and pushed-out pins. If a concern with the exterior mirror jumper harness exists, attempt to repair the jumper harness.

Normal Operation

The exterior mirror control switch receives power through circuit SBP13 (GY/RD) and ground through circuit GD133 (BK). The exterior mirror control switch uses circuit CPM23 (GY) as the common circuit for both exterior mirror motor up/down and right/left movement.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Exterior mirror control switch

Under normal operation, the exterior mirror control switch uses circuit CPM23 (GY) as the common circuit for both exterior mirror up/down and right/left movement.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Exterior mirror control switch
3. Exterior mirror motor
4. Exterior mirror

Under normal operation, the exterior mirror control switch uses circuits CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY) to control the exterior mirror motor movement. The exterior mirror switch controls the LH exterior mirror motor movement by switching voltage and ground to circuits CPM16 (BN/BU), CPM17 (BU/GN) and CPM23 (GY). The exterior mirror switch controls the RH exterior mirror motor movement by switching voltage and ground to circuits CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY).

Mirror Movement

1. When the LH/RH exterior mirror motor receives power through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and ground through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate leftward.
2. When the LH/RH exterior mirror motor receives ground through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and power through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate rightward.
3. When the LH/RH exterior mirror motor receives power through circuit CPM17 (BU/GN)/CPM21 (YE/VT) and ground through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate downward.
4. When the LH/RH exterior mirror motor receives ground through circuit CPM17 (BU/GN)/CPM21 (YE/VT) and power through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate upward.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Exterior mirror control switch
3. Exterior mirror motor
4. Exterior mirror

When the rear window defrost system is on, the rear window defrost relay closes and voltage is supplied through circuit CRD06 (BN/YE) to Battery Junction Box (BJB) fuse 49 (15A). The heated exterior mirrors receive power through circuit CRD13 (GN/VT) from BJB fuse 49 (15A). Ground is supplied to the LH heated exterior mirror through circuit GD133 (BK) and to the RH heated exterior mirror through circuit GD145 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Exterior mirror glass
4. Exterior mirror

Under normal operation, the exterior mirror control switch receives voltage from Smart Junction Box (SJB) fuse 13 (5A) through circuit SBP13 (GY/RD) and ground from circuit GD133 (BK). The exterior mirror control switch uses circuits CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY) to send input signals to the Driver Door Module (DDM). The DDM controls the LH exterior mirror motor movement by supplying the appropriate voltage and ground to circuits CPM26 (WH), CPM28 (BU/BN) and CPM29 (GN). The DDM communicates with the Driver Seat Module (DSM) through the Medium Speed Controller Area Network (MS-CAN) whenever the DDM receives an input signal from the exterior mirror control switch for the RH mirror. The DSM controls the RH exterior mirror motor movement by supplying the appropriate voltage and ground to circuits CPM06 (GN/WH)/CPM31 (YE/GY), CPM33 (WH/VT) and CPM34 (WH/BN).

The memory mirror system uses feedback potentiometers, located in the LH and RH exterior mirror motors, in order to track the movement and position of the LH and RH exterior mirror motors. The DDM supplies the LH exterior mirror feedback potentiometer reference voltage through circuit LPM30 (GY/VT) and ground through circuit RPM30 (YE). The DSM supplies the RH exterior mirror feedback potentiometer reference voltage through circuit LPM30 (GY/VT) and ground through circuit RPM30 (YE). The DDM receives feedback from the LH exterior mirror feedback potentiometer through left/right circuit VPM35 (YE/BU) and up/down circuit VPM36 (BN/YE). The DSM receives feedback from the RH exterior mirror feedback potentiometer through left/right circuit VPM37 (BU/OG) and up/down circuit VPM38 (BN/GN).

DTC REFERENCE CHART

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. DDM
4. DSM
5. Exterior mirror motor
6. Exterior mirror
7. Exterior mirror control switch

The interior auto-dimming mirror receives power from circuit CBP41 (BU) and ground from circuit GD133 (BK). When the autodimming feature is activated, voltage is sent from the interior auto-dimming mirror to the LH exterior auto-dimming mirror (if equipped) though circuit LRD12 (BU/GY). Ground for the LH exterior auto-dimming mirror is provided by the interior auto-dimming mirror through circuit RRD12 (BN). When the vehicle is placed in REVERSE, voltage is sent to the interior auto-dimming mirror through circuit CLS10 (GN/BN) and the interior auto-dimming mirror will turn the dimming feature off. There are 2 photoelectric sensors: one in the front of the interior auto-dimming mirror and one mounted on the glass side of the mirror. If the sensors are blocked, the interior auto-dimming mirror and LH exterior auto-dimming mirror feature might not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose auto-dimming mirror concerns.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Interior auto-dimming mirror
4. LH exterior auto-dimming mirror glass (if equipped)
5. LH exterior auto-dimming mirror (if equipped)