Rear View Mirrors System: Overview Ford Focus I facelift

Principles of Operation

Exterior Power Mirrors - The exterior power mirrors are controlled by the exterior mirror control switch. The exterior mirror control switch is hardwired to the left and right exterior power mirrors, and either mirror can be selected by moving the mirror select switch to either the right or left exterior mirror position. The exterior mirror control switch supplies voltage and ground to the appropriate exterior rear view mirror motor to move the exterior rear view mirror glass to the desired position.

Heated Exterior Rear View Mirror - The heated exterior rear view mirror feature only functions when the rear window defrost is operating. There is no separate control for heated exterior rear view mirrors. The heated exterior rear view mirror voltage is supplied by the rear window defrost relay through a separate fuse that isolates the heated mirrors from the rear window defrost in the event of a concern. The heated exterior rear view mirrors are heated for a period of 15 minutes when the rear window defrost switch is activated.

Normal Operation

Under normal operation the exterior mirror control switch receives voltage through circuit 29-AD12 (OG/YE) and ground through circuit 31-AD12 (BK). The exterior mirror control switch uses circuit 32-AD1 (WH/RD) as the common circuit for both exterior mirror up/down and right/left movement and is a common switched ground/voltage circuit based upon the mirror control switch position.

Possible Causes

1. circuit 29-AD12 (OG/YE) open
2. circuit 31-AD12 (BK) open
3. circuit 32-AD1 (WH/RD) open, short to ground, or short to voltage
4. exterior mirror control switch

Scheme 1

Scheme 2

1. A1 CHECK THE INTERIOR LIGHT OPERATION Check the interior light operation. Do the interior lights operate correctly? YES : Go to A2 . NO : REFER to «INTERIOR LIGHTING»(ref-278277) article to diagnose the interior lights.
2. A2 CHECK THE VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH CIRCUIT Disconnect: Exterior Mirror Control Switch C527 Key in ON position. Measure the voltage between the exterior mirror control switch C527-6, circuit 29-AD12 (OG/YE), harness side and ground. Is the voltage greater than 10 volts? YES : Go to A3 . NO : REPAIR the circuit. TEST the system for normal operation.
3. A3 CHECK THE EXTERIOR MIRROR CONTROL SWITCH GROUND CIRCUIT 31-AD12 (BK) Key in OFF position. Measure the resistance between the exterior mirror control switch C527-4, circuit 31-AD12 (BK), harness side and ground. Is the resistance less than 5 ohms? YES : Go to A4 . NO : REPAIR the circuit. TEST the system for normal operation.
4. A4 CHECK THE EXTERIOR MIRROR CONTROL SWITCH Carry out the exterior mirror control switch component test. Refer to appropriate COMPONENT TESTING article. Is the exterior mirror control switch OK? YES : REPAIR circuit 32-AD1 (WH/RD). TEST the system for normal operation. NO : INSTALL a new exterior mirror control switch. TEST the system for normal operation.

Circuit 32-AD6 (WH) controls the LH exterior mirror up/down and right/left movement. Circuit 32-AD9 (WH/GN) controls the RH exterior mirror up/down and right/left movement. Circuits 32-AD6 (WH) and 32-AD9 (WH/GN) are common switched ground/voltage circuits based upon the mirror control switch position.

Possible Causes

1. circuit 32-AD6 (WH) open
2. circuit 32-AD9 (WH/GN) open
3. exterior mirror control switch
4. exterior mirror

Scheme 3

1. B1 CHECK FOR CONTINUITY BETWEEN THE EXTERIOR MIRROR CONTROL SWITCH AND THE INOPERATIVE EXTERIOR MIRROR Disconnect: Inoperative Exterior Mirror C522 (LH) or C622 (RH) Measure the resistance between the exterior mirror control switch C527-3, circuit 32-AD1 (WH/RD), harness side and the inoperative exterior mirror: LH exterior mirror C522-1, circuit 32-AD6 (WH), harness side. RH exterior mirror C622-1, circuit 32-AD9 (WH/GN), harness side. Is the resistance less than 5 ohms? YES : Go to B2 . NO : REPAIR the circuit in question. TEST the system for normal operation.
2. B2 CHECK THE EXTERIOR MIRROR CONTROL SWITCH Carry out the exterior mirror control switch component test. Refer to appropriate COMPONENT TESTING article. Is the exterior mirror control switch OK? YES : INSTALL a new exterior mirror. REFER to «Exterior Mirror»(ref-278276-S03759608232008012400000) . TEST the system for normal operation. NO : INSTALL a new exterior mirror control switch. TEST the system for normal operation.

Under normal operation the exterior mirror control switch uses circuit 33-AD8 (YE/BU) to control the LH exterior mirror left/right movement, circuit 34-AD7 (BU/RD) to control the LH exterior mirror up/down movement, circuit 32-AD6 (WH) as a common circuit to control the LH exterior mirror up/down and left right movement, circuit 33-AD11 (YE/VT) to control the RH exterior mirror left/right movement, circuit 34-AD10 (BU/YE) to control the RH exterior mirror up/down movement, and circuit 32-AD9 (WH/GN) as a common circuit to control the RH exterior mirror up/down and left right movement. Each circuit is a switched voltage/ground circuit based upon the exterior mirror control switch position.

Possible Causes

1. circuit 33-AD8 (YE/BU) open, short to voltage, or short to ground
2. circuit 34-AD7 (BU/RD) open, short to voltage, or short to ground
3. circuit 33-AD11 (YE/VT) open, short to voltage, or short to ground
4. circuit 34-AD10 (BU/YE) open, short to voltage, or short to ground
5. exterior mirror control switch
6. exterior mirror

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

1. C1 CHECK THE EXTERIOR MIRROR CONTROL SWITCH Carry out the exterior mirror control switch component test. Refer to appropriate COMPONENT TESTING article. Is the exterior mirror control switch OK? YES : LH exterior mirror UP/DOWN inoperative, go to C2 . LH exterior mirror LEFT/RIGHT inoperative, go to C4 . RH exterior mirror UP/DOWN inoperative, go to C6 . RH exterior mirror LEFT/RIGHT inoperative, go to C8 . NO : INSTALL a new exterior mirror control switch. TEST the system for normal operation
2. C2 CHECK CIRCUIT 34-AD7 (BU/RD) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: LH Exterior Mirror C522 Key in ON position. Measure the voltage between the LH exterior mirror C522-2, circuit 34-AD7 (BU/RD), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to C3 .
3. C3 CHECK CIRCUIT 34-AD7 (BU/RD) FOR AN OPEN OR A SHORT TO GROUND Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Measure the resistance between the exterior mirror control switch C527-1, circuit 34-AD7 (BU/RD), harness side and the LH exterior mirror C522-2, circuit 34-AD7 (BU/RD), harness side; and the resistance between the LH exterior mirror C522-2, circuit 34-AD7 (BU/RD), harness side and ground. Is the resistance less than 5 ohms between the exterior mirror control switch and the LH exterior mirror, and greater than 10,000 ohms between the LH exterior mirror and ground? YES : INSTALL a new LH exterior mirror. REFER to «Exterior Mirror»(ref-278276-S03759608232008012400000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
4. C4 CHECK CIRCUIT 33-AD8 (YE/BU) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: LH Exterior Mirror C522 Key in ON position. Measure the voltage between the LH exterior mirror C522-3, circuit 33-AD8 (YE/BU), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to C5 .
5. C5 CHECK CIRCUIT 33-AD8 (YE/BU) FOR AN OPEN OR A SHORT TO GROUND Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Measure the resistance between the exterior mirror control switch C527-7, circuit 33-AD8 (YE/BU), harness side and the LH exterior mirror C522-3, circuit 33-AD8 (YE/BU), harness side; and the resistance between the LH exterior mirror C522-3, circuit 33-AD8 (YE/BU), harness side and ground. Is the resistance less than 5 ohms between the exterior mirror control switch and the LH exterior mirror, and greater than 10,000 ohms between the LH exterior mirror and ground? YES : INSTALL a new LH exterior mirror. REFER to «Exterior Mirror»(ref-278276-S03759608232008012400000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
6. C6 CHECK CIRCUIT 34-AD10 (BU/YE) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: RH Exterior Mirror C622 Key in ON position. Measure the voltage between the RH exterior mirror C622-2, circuit 34-AD10 (BU/YE), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to C7 .
7. C7 CHECK CIRCUIT 34-AD10 (BU/YE) FOR AN OPEN OR A SHORT TO GROUND Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Measure the resistance between the exterior mirror control switch C527-2, circuit 34-AD10 (BU/YE), harness side and the RH exterior mirror C622-2, circuit 34-AD10 (BU/YE), harness side; and the resistance between the RH exterior mirror C622-2, circuit 34-AD10 (BU/YE), harness side and ground. Is the resistance less than 5 ohms between the exterior mirror control switch and the RH exterior mirror, and greater than 10,000 ohms between the RH exterior mirror and ground? YES : INSTALL a new RH exterior mirror. REFER to «Exterior Mirror»(ref-278276-S03759608232008012400000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
8. C8 CHECK CIRCUIT 33-AD11 (YE/VT) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: RH Exterior Mirror C622 Key in ON position. Measure the voltage between the RH exterior mirror C622-3, circuit 33-AD11 (YE/VT), harness side and ground. Is any voltage present? YES : REPAIR the circuit. TEST the system for normal operation. NO : Go to C9 .
9. C9 CHECK CIRCUIT 33-AD11 (YE/VT) FOR AN OPEN OR A SHORT TO GROUND Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Measure the resistance between the exterior mirror control switch C527-5, circuit 33-AD11 (YE/VT), harness side and the RH exterior mirror C622-3, circuit 33-AD11 (YE/VT), harness side; and the resistance between the RH exterior mirror C622-3, circuit 33-AD11 (YE/VT), harness side and ground. Is the resistance less than 5 ohms between the exterior mirror control switch and the RH exterior mirror, and greater than 10,000 ohms between the RH exterior mirror and ground? YES : INSTALL a new RH exterior mirror. REFER to «Exterior Mirror»(ref-278276-S03759608232008012400000) . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.

When the rear window defrost is ON the exterior mirrors receive voltage from the heated grid relay through circuits 15S-HB2 (GN/BU) and 15S-HB35 (GN/BK) on the LH mirror, and circuits 15S-HB2 (GN/BU) and 15S-HB36 (GN/OG) on the RH mirror. The LH mirror is grounded through circuit 31-HB35 (BK) and the RH mirror is grounded through circuit 31-HB36 (BK).

Possible Causes

1. fuse
2. circuit 15S-HB2 (GN/BU) open
3. circuit 15S-HB35 (GN/BK) open
4. circuit 15S-HB36 (GN/OG) open
5. circuit 31-HB35 (BK) open
6. circuit 31-HB36 (BK) open
7. exterior mirror glass

Scheme 10

Scheme 11

1. D1 CHECK THE OPERATION OF THE HEATED REAR WINDOW Key in ON position. Press the heated rear window control switch to the ON position. Does the heated rear window operate correctly? YES : Go to D2 . NO : REFER to «GLASS, FRAMES AND MECHANISMS»(ref-278260) article to diagnose the heated rear window.
2. D2 CHECK THE VOLTAGE TO THE INOPERATIVE EXTERIOR MIRROR Key in OFF position. Disconnect: Inoperative Exterior Mirror C522 (LH) or C622 (RH) Key in ON position. Press the heated rear window control switch to the ON position. Measure the voltage between the: LH exterior mirror C522-4, circuit 15S-HB35 (GN/BK), harness side and ground. RH exterior mirror C622-4, circuit 15S-HB36 (GN/OG), harness side and ground. Is the voltage greater than 10 volts? YES : Go to D3 . NO : VERIFY the central junction box (CJB) fuse 50 (7.5A) is OK. If OK, REPAIR the circuit in question. TEST the system for normal operation.
3. D3 CHECK THE INOPERATIVE EXTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between: LH exterior mirror C522-5, circuit 31-HB35 (BK), harness side and ground. RH exterior mirror C622-5, circuit 31-HB36 (BK), harness side and ground. Is the resistance less than 5 ohms? YES : INSTALL a new heated exterior mirror glass. REFER to «Exterior Mirror Glass»(ref-278276-S24173374262008012400000) . TEST the system for normal operation. NO : REPAIR the circuit in question. TEST the system for normal operation