Door Mirrors

DOOR MIRRORS

DESCRIPTION

General
The door-mirrors operate when the ignition switch is turned to the 'auxiliary' position. Operation of the door mirrors is carried out by door modules located in each front door, in conjunction with the Body Control Unit (BCU).

The BCU can store up to three mirror positions in its memory, which it transmits to the door modules via the peripheral (P) bus. The BCU also initiates mirror heating if the outside temperature is between -10 °C and 35 °C.

If reverse gear is selected, the passenger door mirror will automatically lower to enable the driver to gain a better view of the curb. When reverse gear is deselected, the mirror returns to its original position.

OPERATION

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 11, fuse 24, and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 11 (C0585) provides a constant battery feed to the drivers door module (C2017) on an RP wire. Fuse 24 (C0583) provides a constant battery feed to the passenger door module (C2016) on an RW wire. The drivers (C2017) and passenger (C2016) door modules are both earthed on N wires.

Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028 on V8 vehicles) to fuse 41 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 41 (C0586) provides an auxiliary ignition feed to the Body Control Unit (BCU) (C0660) on a PW wire. The BCU (C0662) is earthed on an N wire.

Drivers Door Mirror

Horizontal Adjustment
When RH adjustment of the drivers door mirror is required, the drivers door module (C2271) provides a feed to the horizontal motor on a G wire. Current flows across the motor and back to the drivers door module (C2271) on an R wire. If LH adjustment of the drivers door mirror is required, the feed to the horizontal motor is reversed. The motor is provided a feed on an R wire, with an earth path provided by the drivers door module (C2271) via a G wire.

To prevent the vertical motor from operating, the drivers door module (C2271) also provides a feed to the vertical motor on an S wire. As the potential difference across the motor is 0V, the motor does not operate.

Vertical Adjustment
When upwards adjustment of the drivers door mirror is required, the drivers door module (C2271) provides a feed to the vertical motor on an S wire. Current flows across the motor and back to the drivers door module (C2271) on an R wire. If downwards adjustment of the drivers door mirror is required, the feed to the vertical motor is reversed. The motor is provided a feed on an R wire, with an earth path provided by the drivers door module (C2271) via an S wire.

To prevent the horizontal motor from operating, the drivers door module (C2271) also provides a feed to the horizontal motor on a G wire. As the potential difference across the motor is 0V, the motor does not operate.

Mirror Memory
The door mirror memory function works in conjunction with the seat and steering wheel memory functions. The BCU (C0660) receives a memory request from the seat memory ECU (C0862) via the K-bus on a WRY wire. The BCU (C0660) relays this message to the drivers door module (C2058) via the P-bus on a UR wire.

When the drivers door module receives a memory request it moves the mirrors as described above. Two potentiometers are fitted within the mirror assembly to determine its position. The drivers door module (C2271) provides a feed to both potentiometers on an 0 wire. The horizontal potentiometer is provided an earth path by the drivers door module (C2271) on a B wire. By measuring the current returned on a W wire, the drivers door module can determine the mirror's horizontal position.

The vertical potentiometer is also provided an earth path by the drivers door module (C2271) on a B wire. By measuring the current returned on a K wire, the drivers door module can determine the mirror's vertical Position.

Mirror Fold
A non-latching mirror folding switch is located on the drivers door module. When the switch is pressed a first time, the drivers door module (C2271) provides a feed to the mirror fold motor on an RU wire. Current flows across the motor and back to the drivers door module (C2271) on a GN wire. The drivers door mirror now moves to the folded position. If the switch is pressed a second time, the feed to the fold motor is reversed. The motor is provided a feed on a GN wire, with an earth path provided by the drivers door module (C2271) via an RU wire.

NOTE: Mirror fold is disabled if vehicle speed is greater than 10 km/h (6 mph).

The drivers door module (C2058) communicates the mirror-fold request to the passenger door module (C2057) via the P-bus on a UR wire.

Mirror Heater
If the BCU (C0660) receives an outside temperature reading of between -10 °C and 35 °C, it informs the drivers door module (C2058) to initiate mirror heating via the P-bus on a UR wire. Pin 7 of the drivers door module (C2271) provides a feed to the door mirror heater on a B wire. An earth path is provided via pin 6 of the drivers door module (C2271), also on a B wire.

Passenger Door Mirror

Horizontal Adjustment
When RH adjustment of the passenger door mirror is required, the passenger door module (C2271) provides a feed to the horizontal motor on a G wire. Current flows across the motor and back to the passenger door module (C2271) on an R wire. If LH adjustment of the passenger door mirror is required, the feed to the horizontal motor is reversed. The motor is provided a feed on an R wire, with an earth path provided by the passenger door module (C2271) via a G wire.

To prevent the vertical motor from operating, the passenger door module (C2271) also provides a feed to the vertical motor on an S wire. As the potential difference across the motor is 0V, the motor does not operate.

Vertical Adjustment
When upwards adjustment of the passenger door mirror is required, the passenger door module (C2271) provides a feed to the vertical motor on an S wire. Current flows across the motor and back to the passenger door module (C2271) on an R wire. If downwards adjustment of the passenger door mirror is required, the feed to the vertical motor is reversed. The motor is provided a feed on an R wire, with an earth path provided by the passenger door module (C2271) via an S wire.

To prevent the horizontal motor from operating, the passenger door module (C2271) also provides a feed to the horizontal motor on a G wire. As the potential difference across the motor is 0V, the motor does not operate.

Mirror Memory
The door mirror memory function works in conjunction with the seat and steering wheel memory functions. The BCU (C0660) receives a memory request from the seat memory ECU (C0862) via the K-bus on a WRY wire. The BCU (C0660) relays this message to the passenger door module (C2057) via the P-bus on a UR wire.

When the passenger door module receives a memory request it moves the mirrors as described above. Two potentiometers are fitted within the mirror assembly to determine its position. The passenger door module (C2271) provides a feed to both potentiometers on an 0 wire. The horizontal potentiometer is provided an earth path by the passenger door module (C2271) on a B wire. By measuring the current returned on a W wire, the passenger door module can determine the mirror's horizontal position.

The vertical potentiometer is also provided an earth path by the passenger door module (C2271) on a B wire. By measuring the current returned on a K wire, the passenger door module can determine the mirror's vertical position.

Mirror Fold
When the passenger door module (C2057) receives a folding request from the drivers door module (C2058) via the P-bus, it provides a feed to the folding mirror motor on an RU wire. Current flows across the motor and back to the passenger door module (C2271) on a GN wire. The passenger door mirror now moves to the folded position. If the passenger door module receives a second fold request, the feed to the folding mirror is reversed. The motor is provided a feed on a GN wire, with an earth path provided by the passenger door module (C2271) via an RU wire.

NOTE: Mirror fold is disabled if vehicle speed is greater than 10 km/h (6 mph)

Mirror Heater
If the BCU (C0660) receives an outside temperature reading of between -10 °C and 35 °C, it informs the passenger door module (C2057) to initiate mirror heating via the P-bus on a UR wire. Pin 7 of the drivers door module (C2271) provides a feed to the door mirror heater on a B wire. An earth path is provided via pin 6 of the drivers door module (C2271), also on a B wire.

NOTE: The driver and passenger door modules have the same connector numbers as they utilize the same harness.

Door Mirror Memory
Door mirror memory information is stored in the driver and passenger door modules. When the memory function is selected, the BCU (C0660) informs the driver (C2058) arid passenger (C2057) door modules to move the mirrors to the required position via the P-bus on a UR wire.