Rear View Mirror: Overview Ford Focus II рестайлинг

Principles of Operation

Exterior Mirrors - The movement of the LH and RH exterior mirror glass is controlled by the exterior mirror control switch and the LH and RH exterior mirror motors. Adjusting the exterior mirror switch to the LH or RH position determines which exterior mirror motor will be controlled. The exterior mirror control switch logic is the selected movement request from the exterior mirror control switch. When the exterior mirror control switch is adjusted to the left, right, up or down position, the exterior mirror control switch will supply voltage and ground to the selected exterior mirror motor to move the exterior mirror glass 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. If a concern with the exterior mirror jumper harness exists and cannot be repaired, a new exterior mirror must be installed.

Heated Exterior Rear View Mirror - The rear window defrost switch controls the operation of the heated exterior rear view mirrors. The heated exterior rear view mirrors only operate when the rear window defrost system is operating. The heated exterior rear view mirror power is supplied by the rear defroster relay through battery junction box (BJB) fuse 1 (15A), which isolates the heated exterior mirrors from the rear window defroster system in the event of a concern.

The interior auto-dimming rear view mirror automatically reduces the glare caused by headlamps reflecting in the interior rear view mirror. Power is supplied to the interior auto-dimming mirror when the ignition is in the RUN position or the accessory delay is active. The auto-dimming feature is disabled when the vehicle is in REVERSE.

The interior auto-dimming rear view mirror has 2 photoelectric sensors, a forward facing sensor and a rearward facing sensor, that detect forward and rearward light conditions. Based on these inputs, 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.

When the forward sensor detects daytime conditions, the rearward sensor is inactive and the interior rear view mirror stays in a high reflectance mode. When the forward sensor detects nighttime conditions, the rearward sensor is active and detects glare from the headlights of vehicles approaching from the rear or other glare-producing light sources. To provide increased visibility when backing up, the interior rear view mirror will automatically return to a high reflectance mode whenever the vehicle is in REVERSE.

If the forward or rearward sensors are blocked, the interior auto-dimming rear view mirror might not work correctly.

Normal Operation

The exterior mirror control switch receives power through circuit SBB12 (GN/RD) and ground through circuit GD133 (BK). 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. Fuse
2. Wiring, terminals or connectors
3. Exterior mirror control switch

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

1. A1 CHECK CIRCUIT SBB12 (GN/RD) FOR VOLTAGE Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Key in ON position. Measure the voltage between exterior mirror control switch C527-1, circuit SBB12 (GN/RD) harness side and ground. Is the voltage greater than 10 volts? YES : Go to A2 . NO : VERIFY that smart junction box (SJB) fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
2. A2 CHECK CIRCUIT GD133 (BK) FOR AN OPEN Key in OFF position. Measure the resistance between exterior mirror control switch C527-3, circuit GD133 (BK) harness side and ground. Is the resistance less than 5 ohms? YES : Go to A3 . NO : REPAIR the circuit. TEST the system for normal operation.
3. A3 CHECK CIRCUIT CPM23 (GY) FOR A SHORT TO VOLTAGE Key in ON position. Measure the voltage between exterior mirror control switch C527-6, circuit CPM23 (GY) harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to A4 .
4. A4 CHECK CIRCUIT CPM23 (GY) FOR A SHORT TO GROUND Key in OFF position. Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY) harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to A5 . NO : REPAIR the circuit. TEST the system for normal operation.
5. A5 CHECK CIRCUIT CPM23 (GY) FOR AN OPEN Disconnect: LH Exterior Mirror C520 Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY) harness side and LH exterior mirror C520-2, circuit CPM23 (GY) harness side. Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror control switch. TEST the system for normal operation. NO : REPAIR the circuit. TEST system for normal operation.

The exterior mirror control 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 ground through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and power through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate right.
2. 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 left.
3. 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.
4. 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.

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

The exterior mirror control 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 ground through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and power through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate right.
2. 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 left.
3. 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.
4. 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.

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

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

1. C1 CHECK THE MIRROR MOVEMENT (RIGHT/LEFT) NOTE: Position the exterior mirror control switch to the LH or RH position. Operate the RH and LH exterior mirrors in the right and left direction using the exterior mirror control switch. Do the RH and LH exterior mirrors move left and right? YES : Go to C2 . NO : Go to C3 .
2. C2 CHECK THE MIRROR MOVEMENT (DOWN/UP) NOTE: Position the exterior mirror control switch to the LH or RH position. Operate the RH and LH exterior mirrors in the down and up direction using the exterior mirror control switch. Do the RH and LH exterior mirrors move up and down? YES : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation. NO : Go to C4 .
3. C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR Key in OFF position. Disconnect: Inoperative LH Exterior Mirror C520 or RH Exterior Mirror C601 NOTE: Position the exterior mirror control switch to the LH or RH position. While operating the exterior mirror control switch in the LEFT position, measure the voltage between ground and inoperative exterior mirror: (LH) C520-1, circuit CPM16 (BN/BU) harness side. (RH) C601-1, circuit CPM20 (BN/WH) harness side. Is the voltage greater than 10 volts? YES : CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new RH or LH exterior mirror. REFER to «Exterior Mirror»(ref-357178-S01661825982010030800000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «Exterior Mirror Motor»(ref-357178-S29387554672010030800000) . TEST the system for normal operation. NO : Go to C5 .
4. C4 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR Key in OFF position. Disconnect: Inoperative LH Exterior Mirror C520 or RH Exterior Mirror C601 NOTE: Position the exterior mirror control switch to the LH or RH position. While operating the exterior mirror control switch in the DOWN position, measure the voltage between ground and inoperative exterior mirror: (LH) C520-3, circuit CPM17 (BU/GN) harness side. (RH) C601-3, circuit CPM21 (YE/VT) harness side. Is the voltage greater than 10 volts? YES : CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new RH or LH exterior mirror. REFER to «Exterior Mirror»(ref-357178-S01661825982010030800000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «Exterior Mirror Motor»(ref-357178-S29387554672010030800000) . TEST the system for normal operation. NO : Go to C6 .
5. C5 CHECK CIRCUITS CPM16 (BN/BU) AND CPM20 (BN/WH) FOR AN OPEN Disconnect: Exterior Mirror Control Switch C527 Inoperative LH mirror: Measure the resistance between LH exterior mirror C520-1, circuit CPM16 (BN/BU) harness side and exterior mirror control switch C527-8, circuit CPM16 (BN/BU) harness side. Inoperative RH mirror: Measure the resistance between RH exterior mirror C601-1, circuit CPM20 (BN/WH) harness side and exterior mirror control switch C527-7, circuit CPM20 (BN/WH) harness side. Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror control switch. TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
6. C6 CHECK CIRCUITS CPM17 (BU/GN) AND CPM21 (YE/VT) FOR AN OPEN Disconnect: Exterior Mirror Control Switch C527 Inoperative LH mirror: Measure the resistance between LH exterior mirror C520-3, circuit CPM17 (BU/GN) harness side and exterior mirror control switch C527-5, circuit CPM17 (BU/GN) harness side. Inoperative RH mirror: Measure the resistance between RH exterior mirror C601-3, circuit CPM21 (YE/VT) harness side and exterior mirror control switch C527-2, circuit CPM21 (YE/VT) harness side. Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror control switch. TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.

When the rear window defrost is ON, power is supplied to the heated exterior mirrors from the rear defrost relay through circuit CBB01 (BU). Ground is supplied to the LH exterior mirror through circuit GD133 (BK) and to the RH exterior mirror through circuit GD156 (BK/VT).

This pinpoint test is intended to diagnose the following

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

Scheme 12

Scheme 13

1. D1 CHECK THE REAR WINDOW DEFROST SWITCH OPERATION Key in ON position. With the engine running, depress the rear window defrost switch to the ON position. Place a hand on the rear window to verify that the rear window heats up. Does the rear window defrost system operate? YES : Go to D2 . NO : REFER to «GLASS, FRAMES AND MECHANISMS»(ref-357170) article to diagnose the rear window defrost system.
2. D2 CHECK THE OPERATION OF THE LH HEATED EXTERIOR MIRROR GLASS With the rear window defrost switch in the ON position, place a hand on the LH exterior mirror glass to verify that the LH exterior mirror glass heats up. Does the LH heated exterior mirror glass operate? YES : Go to D5 . NO : Go to D3 .
3. D3 CHECK CIRCUIT CBB01 (BU) FOR VOLTAGE Key in OFF position. Disconnect: LH Exterior Mirror C520 Key in ON position. NOTE: The rear window defrost system will be activated for a period of 10 minutes. With the engine running, depress the rear window defrost switch to the ON position. Measure the voltage between LH exterior mirror C520-4, circuit CBB01 (BU) harness side and ground. Is the voltage greater than 10 volts? YES : Go to D4 . NO : VERIFY that battery junction box (BJB) fuse 1 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
4. D4 CHECK CIRCUIT GD133 (BK) FOR AN OPEN Key in OFF position. Measure the resistance between LH exterior mirror C520-5, circuit GD133 (BK) harness side and ground. Is the resistance less than 5 ohms? YES : CHECK the LH exterior mirror jumper harness between the vehicle harness and the exterior mirror glass for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new exterior mirror. REFER to «Exterior Mirror»(ref-357178-S01661825982010030800000) . If the jumper harness is OK, INSTALL a new exterior mirror glass. REFER to «Exterior Mirror Glass»(ref-357178-S04236603822010030800000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
5. D5 CHECK CIRCUIT CBB01 (BU) FOR VOLTAGE Key in OFF position. Disconnect: RH Exterior Mirror C601 Key in ON position. With the engine running, depress the rear window defrost switch to the ON position. Measure the voltage between RH exterior mirror C601-4, circuit CBB01 (BU) harness side and ground. Is the voltage greater than 10 volts? YES : Go to D6 . NO : REPAIR the circuit. TEST the system for normal operation.
6. D6 CHECK CIRCUIT GD156 (BK/VT) FOR AN OPEN Measure the resistance between RH exterior mirror C601-5, circuit GD156 (BK/VT) harness side and ground. Is the resistance less than 5 ohms? YES : CHECK the RH exterior mirror jumper harness between the vehicle harness and the exterior mirror glass for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new exterior mirror. REFER to «Exterior Mirror»(ref-357178-S01661825982010030800000) . If the jumper harness is OK, INSTALL a new exterior mirror glass. REFER to «Exterior Mirror Glass»(ref-357178-S04236603822010030800000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.

The interior auto-dimming mirror receives power from circuit CPL60 (BN/YE) and ground from circuit GD161 (BK/YE). The auto-dimming feature will be disabled when the selector lever is placed in REVERSE and the interior auto-dimming mirror receives voltage through circuit CLS10 (GN/BN). There are 2 photoelectric sensors: one in the front of the interior rear view mirror and one mounted on the glass side of the mirror. If the sensors are blocked, the interior auto-dimming feature might not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose interior 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