Rear View Mirrors - System Operation and Component Description

System Operation

System Diagram - Exterior, Power

Network Message Chart

  Module Network Input Messages — PDM

Rear View Mirrors - Exterior, Power

When the exterior mirror control switch is pressed left, right, up or down with the LH or RH exterior mirror selected, the movement request is sent to the DDM through a LIN circuit. If the LH mirror is selected, the DDM supplies voltage and ground to the appropriate LH exterior mirror motor. If the RH mirror is selected, the DDM sends the passenger mirror command message with the input from the exterior mirror control switch to the PDM . The PDM then supples voltage and ground to the appropriate RH exterior mirror motor.

System Diagram - Exterior, Heated

Network Message Chart

  Module Network Input Messages — DDM

  Module Network Input Messages — PDM

Rear View Mirrors - Exterior, Heated

Based on the Mirror Heat Request message received from the FCIM through the Medium Speed Controller Area Network (MS-CAN), the DDM controls the operation of the LH heated exterior mirror glass and the PDM controls the operation of the RH heated exterior mirror glass. On vehicles equipped with a LH exterior auto-dimming mirror, the LH exterior mirror glass takes longer to defrost than the RH exterior mirror glass due to differences in the mirror glass thickness.

System Diagram - Exterior, Memory

Network Message Chart

  Module Network Input Messages — DSM

  Module Network Input Messages — DDM

  Module Network Input Messages — PDM

Rear View Mirrors - Exterior, Memory

When a memory recall or save is initiated, the DSM sends the Memory Command message to the DDM and PDM through the Medium Speed Controller Area Network (MS-CAN). Based on this message, the DDM and PDM recall the requested memory preset mirror position or save the current mirror position to the requested preset. During a memory recall, the DDM and PDM supply voltage and ground to the appropriate exterior mirror motors to achieve the desired memory positions that are stored in memory based on feedback from the mirror motor potentiometers. If the exterior mirror control switch is activated in any direction during a memory recall, the DDM sends the Manual Mirror Override message to the DSM . After this message is received, the DSM sends the Memory Command message to abort the memory recall and the DDM or PDM respond to the exterior mirror control switch inputs. A memory recall will also be aborted if the driver seat control switch is activated in any direction during a memory recall event.

A memory recall can be initiated by the memory set switch, RKE transmitter or Intelligent Access (IA) key (if equipped). When a preset button on the memory set switch is pressed momentarily, the memory position corresponding to the button that was pressed is recalled by the driver seat and the exterior mirrors. When the vehicle is unlocked with a RKE transmitter or the LF door is opened with an Intelligent Access (IA) key in range, the positioning of the driver seat and exterior mirrors that were last used with that specific RKE or Intelligent Access (IA) key are recalled.

A memory save can be initiated by pressing and holding a preset button on the memory set switch with the driver seat and exterior mirrors set to the desired positions. The driver seat and exterior mirror positions can also be associated with a specific RKE transmitter or Intelligent Access (IA) key by turning the ignition off with the driver seat and exterior mirrors set to the positions that the operator would like to associate with the RKE transmitter or Intelligent Access (IA) key that is currently in use.

Rear View Mirrors - Exterior Auto-Dimming

When bright light is detected from behind the vehicle during nighttime conditions, the interior auto-dimming mirror supplies voltage and ground to electronically darken the LH exterior mirror glass.

To provide increased visibility when backing up, the LH exterior mirror glass automatically returns to a high reflectance mode whenever the vehicle is in REVERSE, regardless of exterior lighting conditions

Rear View Mirrors - Interior

The interior auto-dimming mirror uses 2 integral photoelectric sensors to detect exterior lighting conditions. When the forward facing sensor detects daytime conditions, the rearward facing sensor is inactive and the mirror glass stays in a high reflectance mode. When the forward facing sensor detects nighttime conditions, the rearward facing sensor is active. When bright lights (glare) are detected by the rearward facing sensor, the mirror glass is electronically darkened. To provide increased visibility when backing up, the interior rear view mirror automatically returns to a high reflectance mode whenever the vehicle is in REVERSE, regardless of exterior lighting conditions.

Component Description

Exterior Mirror Control Switch

The exterior mirror control switch is a momentary contact switch that is integral to the master window control switch and connected to the DDM through a LIN circuit. The LED on each exterior mirror selection button illuminates to indicate which exterior mirror is selected for adjustment.

Exterior Mirror

For the power mirror function, each exterior mirror has 2 bi-directional motors that are used to control the position of the exterior mirror glass.

The heated exterior mirrors use heating elements that are integral to the exterior mirror glass.

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

Driver Door Module (DDM)

For the power mirror function, the DDM controls the LH exterior mirror glass position by supplying voltage and ground to the LH exterior mirror motors based on inputs from the exterior mirror control switch. When the RH exterior mirror is selected, the DDM forwards the movement requests to the PDM through the Medium Speed Controller Area Network (MS-CAN).

To control the heated mirror function, the DDM supplies voltage and ground to the LH exterior mirror glass heating element based on messages received from the FCIM .

For the memory mirror function, the DDM supplies voltage and ground to the LH mirror motor potentiometers. The DDM monitors the feedback from these potentiometers to determine the mirror glass position. Memory mirror positions are stored in the DDM memory.

Passenger Door Module (PDM)

For the power mirror function, the PDM controls the RH exterior mirror glass position by supplying voltage and ground to the RH exterior mirror motors based on messages received from the DDM .

To control the heated mirror function, the PDM supplies voltage and ground to the RH exterior mirror glass heating element based on messages received from the FCIM .

For the memory mirror function, the PDM supplies voltage and ground to the RH mirror motor potentiometers. The PDM monitors the feedback from these potentiometers to determine the mirror glass position. Memory mirror positions are stored in the PDM memory.

Interior Rear View Mirror - Auto-Dimming

The auto-dimming rear view mirror has 2 photoelectric sensors, one on the front of the mirror (facing the windshield) and one on the rear of the mirror (at the top of the mirror glass). Based on inputs from these sensors, the automatic dimming feature adjusts the reflectance level of the interior rear view mirror glass to eliminate unwanted glare. The reflectance level of the mirror glass is variable and depends on the amount of rear glare in relation to ambient light conditions in front of the interior mirror.

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