Rear View Mirror System: Overview Mercury Mariner II

Normal Operation

The exterior mirror control switch receives power through circuit SBP12 (GN/RD) and ground through circuit GD182 (BK/GY). 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. Fuse
3. Exterior mirror control switch

Scheme 1

Scheme 2

Scheme 3

1. A1 CHECK CIRCUIT SBP12 (GN/RD) FOR VOLTAGE Key in OFF position. Disconnect: Exterior Mirror Control Switch C527 Measure the voltage between exterior mirror control switch C527-1, circuit SBP12 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to A2 . NO : VERIFY the smart junction box (SJB) fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, refer to the Wiring Diagrams Manual to identify the possible causes of the short.
2. A2 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN Measure the resistance between exterior mirror control switch C527-3, circuit GD182 (BK/GY), 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 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. REFER to Exterior Mirror Control Switch . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.

Under normal operation, the exterior mirror control switch uses circuit CPM23 (GY) as the common circuit for both of the exterior mirrors 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

The exterior mirror control switch uses circuits CPM14 (GY/BN), CPM15 (VT/OG), CPM18 (GN/BN), CPM19 (GY/OG) and CPM23 (GY) to control the exterior mirror movement.

1. When power is directed through circuit CPM15 (VT/OG)/CPM19 (GY/OG) and ground through circuit CPM23 (GY), the LH/RH exterior mirror operates left.
2. When ground is directed through circuit CPM15 (VT/OG)/CPM19 (GY/OG) and power through circuit CPM23 (GY), the LH/RH exterior mirror operates right.
3. When power is directed through circuit CPM14 (GY/BN)/CPM18 (GN/BN) and ground through circuit CPM23 (GY), the LH/RH exterior mirror operates down.
4. When ground is directed through circuit CPM14 (GY/BN)/CPM18 (GN/BN) and power through circuit CPM23 (GY), the LH/RH exterior mirror operates up.

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 4

Scheme 5

Scheme 6

Scheme 7

1. C1 CHECK THE MIRROR MOVEMENT (LEFT/RIGHT) Using the exterior mirror control switch, operate the LH and RH exterior mirrors in the left and right direction. Do the exterior mirrors move left and right? YES : Go to C2 . NO : Go to C4 .
2. C2 CHECK THE MIRROR MOVEMENT (UP/DOWN) Using the exterior mirror control switch, operate the LH and RH exterior mirrors in the up and down direction. Do the 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 C3 .
3. C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR Key in OFF position. Disconnect: Inoperative Exterior Mirror C520 (LH) or C601 (RH) While operating the exterior mirror control switch, measure the voltage between LH exterior mirror C520-1, circuit CPM14 (GY/BN), harness side and ground; or between RH exterior mirror C601-1, circuit CPM18 (GN/BN), harness side and ground. Is the voltage greater than 10 volts? YES : CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open or shorted 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 LH or RH exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to Exterior Mirror Motor . 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 Exterior Mirror C520 (LH) or C601 (RH) While operating the exterior mirror control switch, measure the voltage between LH exterior mirror C520-3, circuit CPM15 (VT/OG), harness side and ground; or between RH exterior mirror C601-3, circuit CPM19 (GY/OG), harness side and ground. Is the voltage greater than 10 volts? YES : CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open or shorted 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 LH or RH exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to Exterior Mirror Motor . TEST the system for normal operation. NO : Go to C6 .
5. C5 CHECK FOR AN OPEN TO THE INOPERATIVE MIRROR Measure the resistance between exterior mirror control switch C527-5, circuit CPM14 (GY/BN), harness side and LH exterior mirror C520-1, circuit CPM14 (GY/BN), harness side; or between exterior mirror control switch C527-2, circuit CPM18 (GN/BN), harness side and RH exterior mirror C601-1, circuit CPM18 (GN/BN), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch . TEST the system for normal operation. NO : REPAIR the circuit in question. TEST the system for normal operation.
6. C6 CHECK FOR AN OPEN TO THE INOPERATIVE MIRROR Measure the resistance between exterior mirror control switch C527-8, circuit CPM15 (VT/OG), harness side and LH exterior mirror C520-3, circuit CPM15 (VT/OG), harness side; or between exterior mirror control switch C527-7, circuit CPM19 (GY/OG), harness side and RH exterior mirror C601-3, circuit CPM19 (GY/OG), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch . TEST the system for normal operation. NO : REPAIR the circuit in question. TEST the system for normal operation.

The interior auto-dimming rear view mirror receives power from circuit CBP43 (GY) (early build) or CBP41 (BU) (late build). Ground is supplied to the interior auto-dimming rear view mirror through circuit GD182 (BK/GY). If the vehicle is placed in REVERSE, voltage is sent to circuit CBB07 (GN/BU) and the interior auto-dimming rear view mirror turns the dimming feature off.

There are 2 photoelectric sensors: one in the front of the mirror and one mounted on the glass side of the mirror. If the sensors are blocked, the auto-dimming feature may not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose interior auto-dimming rear view mirror concerns.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Interior auto-dimming rear view mirror

When the rear window defrost is on, the heated exterior mirrors receive voltage from the rear defrost relay through circuit CBB01 (BU) and ground through circuit GD149 (BK/GY).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Exterior mirror glass
3. Exterior mirror
4. Rear window defrost system
5. Battery junction box (BJB)

Scheme 8

Scheme 9

Scheme 10

1. E1 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM Key in START position. Press the rear window defrost switch to the ON position. Place hand on heated rear window to make sure heated rear window heats up. Does the rear window defrost operate? YES : Go to E2 . NO : REFER to GLASS, FRAMES AND MECHANISMS article to diagnose the rear window defrost system.
2. E2 CHECK CIRCUIT CBB01 (BU) FOR VOLTAGE Key in OFF position. Disconnect: Inoperative Exterior Mirror Key in START position. Press 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; or between RH exterior mirror C601-4, circuit CBB01 (BU), harness side and ground. Is the voltage greater than 10 volts? YES : Go to E3 . NO : VERIFY the BJB fuse 1 (15A) is OK. If OK, go to E4 . If not OK, refer to the Wiring Diagrams Manual to identify the possible causes of the short.
3. E3 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN Key in OFF position. Measure the resistance between LH exterior mirror C520-5, circuit GD149 (BK/GY), harness side and ground; or between RH exterior mirror C601-5, circuit GD149 (BK/GY), harness side and ground. Is the resistance less than 5 ohms? YES : CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open or shorted 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 LH or RH exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new exterior mirror glass. REFER to Exterior Mirror Glass . TEST the system for normal operation. NO : REPAIR the circuit. TEST the system for normal operation.
4. E4 CHECK CIRCUIT CBB01 (BU) FOR AN OPEN Key in OFF position. Disconnect: Rear Defrost Relay Measure the resistance between rear defrost relay pin 5, harness side and LH exterior mirror C520-4, circuit CBB01 (BU), harness side; or between rear defrost relay pin 5, harness side and RH exterior mirror C601-4, circuit CBB01 (BU), harness side. Is the resistance less than 5 ohms? 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 : REPAIR the circuit. TEST the system for normal operation.