Pinpoint Test B: A Single Mirror Is Inoperative
Rear View Mirrors - Exterior
Pinpoint Tests
Pinpoint Test B: A Single Mirror is Inoperative
Refer to Wiring Diagram Set 124 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Power Mirrors for schematic and connector information. Diagrams By Number
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 used to diagnose the following:
- Wiring, terminals or connectors
- Exterior mirror control switch
- Exterior mirror motor
- Exterior mirror
PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE
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B1 CHECK THE LH AND RH EXTERIOR MIRRORS
- Operate the LH exterior mirror using the exterior mirror control switch.
- Does the LH mirror operate?
Yes
GO to B2.
No
GO to B3.
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B2 CHECK CIRCUIT CPM23 (GY) FOR AN OPEN - LH MIRROR
- Ignition OFF.
- Disconnect: LH Exterior Mirror C520.
- Disconnect: Exterior Mirror Control Switch C527.
- Measure the resistance between the exterior mirror control switch C527-6, CPM23 (GY) and LH exterior mirror C520-2 CPM23 (GY), harness side.
- is the resistance less than 5 ohms?
Yes
GO to B4.
No
REPAIR the circuit. TEST the system for normal operation.
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B3 CHECK CIRCUIT CPM23 (GY) FOR AN OPEN - RH MIRROR
- Disconnect: RH Exterior Mirror C601.
- Measure the resistance between the exterior mirror control switch C527-6, CPM23 (GY) and RH exterior mirror C601-2 CPM23 (GY), harness side.
- is the resistance less than 5 ohms?
Yes
GO to B4.
No
REPAIR the circuit. TEST the system for normal operation.
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B4 CHECK THE EXTERIOR MIRROR CONTROL SWITCH
- Carry out the exterior mirror control switch component test.
- Does the exterior mirror control switch pass the component test?
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 Exterior Mirror. If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. TEST the system for normal operation.
No
INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch Service and Repair. TEST the system for normal operation.
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