Part 1
Rear View Mirrors - Exterior
Pinpoint Tests
Pinpoint Test D: The Memory Mirror is Inoperative
Refer to Wiring Diagram Set 124 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Power Mirrors for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the exterior mirror control switch receives power from circuit SBP12 (GN/RD) and ground from circuit GD126 (BK/WH). The exterior mirror control switch uses circuits CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY) to send input signals to the Driver Door Module (DDM). The DDM controls the LH exterior mirror motor movement by supplying the appropriate power and ground to circuits CPM27 (GY/BU), CPM28 (BU/BN) and CPM29 (GN). The DDM communicates with the Driver Seat Module (DSM) through the Medium Speed Controller Area Network (MS-CAN) whenever the DDM receives an input signal from the exterior mirror control switch for the RH mirror. The DSM controls the RH exterior mirror motor movement by supplying the appropriate power and ground to circuits CPM31 (YE/GY), CPM33 (WH/VT) and CPM34 (WH/BN).
The memory mirror system uses feedback potentiometers, located in the LH and RH exterior mirror motors, in order to track the movement and position of the LH and RH exterior mirror motors. The DDM supplies the LH exterior mirror feedback potentiometer reference voltage through circuit LPM30 (GY/VT) and ground through circuit RPM30 (YE). The DSM supplies the RH exterior mirror feedback potentiometer reference voltage through circuit LPM30 (GY/VT) and ground through circuit RPM30 (YE). The DDM receives feedback from the LH exterior mirror feedback potentiometer through left/right circuit VPM35 (YE/BU) and up/down circuit VPM36 (BN/YE). The DSM receives feedback from the RH exterior mirror feedback potentiometer through left/right circuit VPM37 (BU/OG) and up/down circuit VPM38 (BN/GN).
B1667-B2326:
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- DDM
- DSM
- Exterior mirror motor
- Exterior mirror
- Exterior mirror control switch
PINPOINT TEST D: THE MEMORY MIRROR IS INOPERATIVE
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D1 RETRIEVE THE DTCs FROM THE DSM AND DDM
- Use the recorded DSM and DDM DTCs from the continuous and on-demand self tests.
- Are DTCs retrieved?
Yes
If DTC B1733, B1737, B1741 or B1745 - CARRY OUT the Exterior Mirror Control Switch component test.
If the switch tests OK, GO to D11.
If DTC B1667 or B1668 - If other DTCs are present, DIAGNOSE them first. If no other DTCs are present, INSPECT the LH exterior mirror motor for foreign material, damage or a binding condition. If no condition is found,
GO to D12.
If DTC B1669 or B1670 - If other DTCs are present, DIAGNOSE them first. If no other DTCs are present, INSPECT the RH exterior mirror motor for foreign material, damage or a binding condition. If no condition is found,
GO to D14.
If DTC B2223, GO to D16.
If DTC B2224, GO to D19.
If DTC B2312, B2316, B2320 or B2324, GO to D22.
If DTC B2314, B2318, B2322 or B2326, GO to D26.
No
GO to D2.
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D2 CHECK THE OPERATION OF THE EXTERIOR MIRRORS FROM THE EXTERIOR MIRROR CONTROL SWITCH
- Operate the mirrors using the exterior mirror control switch.
- Do the mirrors operate momentarily using the exterior mirror control switch?
Yes
GO to D8.
No
GO to D3.
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D3 CHECK THE EXTERIOR MIRROR CONTROL SWITCH
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Carry out the Exterior Mirror Control Switch component test.
- Did the exterior mirror control switch pass the component test?
Yes
GO to D4.
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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D4 CHECK CIRCUIT SBP12 (GN/RD) FOR VOLTAGE
- Ignition ON.
- Measure the voltage between exterior mirror control switch C527-3, circuit SBP12 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to D5.
No
VERIFY Smart Junction Box (SJB) fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Diagrams By Number. TEST the system for normal operation.
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D5 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between exterior mirror control switch C527-1, circuit GD126 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to D6.
No
REPAIR the circuit. TEST the system for normal operation.
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D6 CHECK CIRCUITS CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) AND CPM23 (GY) FOR A SHORT TO GROUND
- Disconnect: DDM C568B.
- Measure the resistance between ground and exterior mirror control switch:
- C527-2, circuit CPM21 (YE/VT), harness side.
- C527-5, circuit CPM17 (BU/GN), harness side.
- C527-6, circuit CPM23 (GY), harness side.
- C527-7, circuit CPM20 (BN/WH), harness side.
- C527-8, circuit CPM16 (BN/BU), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to D7.
No
REPAIR the circuit(s). TEST the system for normal operation.
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D7 CHECK CIRCUITS CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) AND CPM23 (GY) FOR AN OPEN
- Measure the resistance between exterior mirror control switch C527, harness side and DDM C568A, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to D29.
No
REPAIR the circuit(s). TEST the system for normal operation.
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D8 CHECK CIRCUIT RPM30 (YE) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Inoperative LH Mirror: DDM C568A and DDM C568B.
- Disconnect: Inoperative RH Mirror: DSM C3299C and C3299D.
- Ignition ON.
- Inoperative LH mirror: Measure the voltage between DDM C568B-21, circuit RPM30 (YE), harness side and ground.
- Inoperative RH mirror: Measure the voltage between DSM C3299D-11, circuit RPM30 (YE), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to D9.
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D9 CHECK CIRCUIT LPM30 (GY/VT) FOR SHORT TO GROUND
- Ignition OFF.
- Disconnect: Inoperative Exterior Mirror C522 (LH) or C626 (RH).
- Inoperative LH mirror: Measure the resistance between DDM C568B-9, circuit LPM30 (GY/VT), harness side and ground.
- Inoperative RH mirror: Measure the resistance between DSM C3299D-1, circuit LPM30 (GY/VT), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D10.
No
REPAIR the circuit. TEST the system for normal operation.
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D10 CHECK CIRCUITS RPM30 (YE) AND LPM30 (GY/VT) FOR AN OPEN
- Inoperative LH mirror: Measure the resistance between LH exterior mirror C522, harness side, DDM C568A, harness side and DDM C568B, harness side using the following chart:
- Inoperative RH mirror: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299C, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motors 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 LH or RH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
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D11 CHECK CIRCUITS CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) AND CPM23 (GY) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Disconnect: DDM C568B.
- Ignition ON.
- Measure the voltage between ground and exterior mirror control switch:
- C527-2, circuit CPM21 (YE/VT), harness side.
- C527-5, circuit CPM17 (BU/GN), harness side.
- C527-6, circuit CPM23 (GY), harness side.
- C527-7, circuit CPM20 (BN/WH), harness side.
- C527-8, circuit CPM16 (BN/BU), harness side.
- Is any voltage present?
Yes
REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
No
GO to D29.
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D12 CHECK THE EXTERIOR MIRROR FOR VOLTAGE FROM THE DDM
- Ignition OFF.
- Disconnect: LH Exterior Mirror C522.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DDM DataLogger.
- DTC B1667: Measure the voltage between LH exterior mirror C522-1, circuit CPM29 (GN), harness side and ground while toggling the LH exterior mirror DDM PID DR_UP to ON; and between LH exterior mirror C522-2, circuit CPM27 (GY/BU), harness side and ground while toggling the LH exterior mirror DDM PID DR_DOWN to ON.
- DTC B1668: Measure the voltage between LH exterior mirror C522-3, circuit CPM27 (GY/BU), harness side and ground while toggling the LH exterior mirror DDM PID DR_LEFT to ON; and between LH exterior mirror C522-4, circuit CPM28 (BU/BN), harness side and ground while toggling the LH exterior mirror DDM PID DR_RIGHT to ON.
- Do the voltages momentarily change from 0 volt to greater than 10 volts when the active command is toggled ON?
Yes
CHECK the LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for shorted and 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 LH exterior mirror. REFER to Exterior Mirror Exterior Mirror. If the jumper harness is OK, INSTALL a new LH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. CLEAR the DTCs. TEST the system for normal operation.
No
GO to D13.
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D13 CHECK CIRCUITS CPM27 (GY/BU), CPM28 (BU/BN) AND CPM29 (GN) FOR AN OPEN
- Ignition OFF.
- Disconnect: DDM C568B.
- DTC B1667: Measure the resistance between LH exterior mirror C522, harness side and DDM C568B, harness side using the following chart:
- DTC B1668: Measure the resistance between LH exterior mirror C522, harness side and DDM C568B, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to D29.
No
REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
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D14 CHECK THE EXTERIOR MIRROR FOR VOLTAGE FROM THE DSM
- Ignition OFF.
- Disconnect: RH Exterior Mirror C626.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DSM DataLogger.
- DTC B1669: Measure the voltage between RH exterior mirror C626-1, circuit CPM34 (WH/BN), harness side and ground while toggling the RH exterior mirror DSM PID PR_UP to ON; and between RH exterior mirror C626-2, circuit CPM31 (YE/GY), harness side and ground while toggling the RH exterior mirror DSM PID PR_DOWN to ON.
- DTC B1670: Measure the voltage between RH exterior mirror C626-3, circuit CPM31 (YE/GY), harness side and ground while toggling the RH exterior mirror DSM PID PR_LEFT to ON; and between RH exterior mirror C626-4, circuit CPM33 (WH/VT), harness side and ground while toggling the RH exterior mirror DSM PID PR_RIGHT to ON.
- Do the voltages momentarily change from 0 volt to greater than 10 volts when the active command is toggled ON?
Yes
CHECK the RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for shorted and 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 exterior mirror. REFER to Exterior Mirror Exterior Mirror. If the jumper harness is OK, INSTALL a new RH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. CLEAR the DTCs. TEST the system for normal operation.
No
GO to D15.
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D15 CHECK CIRCUITS CPM31 (YE/GY), CPM33 (WH/VT) AND CPM34 (WH/BN) FOR AN OPEN
- Ignition OFF.
- Disconnect: DSM C3299D.
- DTC B1669: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299D, harness side using the following chart:
- DTC B1670: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299D, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to D28.
No
REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
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