Rear View Mirror: Overview Lincoln MKZ I рестайлинг

Principles of Operation

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.

Only vehicles equipped with memory exterior rear view mirrors are capable of setting DTCs.

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.

Normal Operation

Under normal operation, the exterior mirror control switch receives power through circuit SBP12 (GN/RD) and ground through circuit GD126 (BK/WH). The exterior mirror control switch uses circuit CPM23 (GY) as the common circuit for both exterior mirror motor 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

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1. A1 CHECK THE VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH Ignition OFF. Disconnect: Exterior Mirror Control Switch C527. 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 A2 . No: VERIFY Smart Junction Box (SJB) fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.
2. A2 CHECK GROUND TO THE EXTERIOR MIRROR CONTROL SWITCH 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 A3 . No: REPAIR the circuit. TEST the system for normal operation.
3. A3 CHECK CIRCUIT CPM23 (GY) FOR A SHORT TO VOLTAGE Ignition ON. 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 Ignition OFF. 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

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1. Disconnect: LH Exterior Mirror C516 (without heated mirrors) or C517 (with heated mirrors).
2. Without heated mirrors: Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY), harness side and LH exterior mirror C516-2, circuit CPM23 (GY), harness side.
3. With heated mirrors: Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY), harness side and LH exterior mirror C517-2, circuit CPM23 (GY), harness side.
4. Is the resistance less than 5 ohms?

1. Yes: INSTALL a new exterior mirror control switch. REFER to «Removal and Installation»(ref-356023-S37264283422010013000000) . TEST the system for normal operation.
2. 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 exterior mirror down/up and left/right 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

Under normal operation, the exterior mirror control switch uses circuits CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY) to control the exterior mirror motor movement. The exterior mirror 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).

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).

DTC DESCRIPTION TABLE

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. DDM
4. DSM
5. Exterior mirror motor
6. Exterior mirror
7. Exterior mirror control switch

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1. 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. Refer to «COMPONENT TESTING - HYBRID»(ref-357069) for component testing. 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 .
2. 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 .
3. D3 CHECK THE EXTERIOR MIRROR CONTROL SWITCH Ignition OFF. Disconnect: Exterior Mirror Control Switch C527. Carry out the Exterior Mirror Control Switch component test. Refer to «COMPONENT TESTING - HYBRID»(ref-357069) for component testing. Did the exterior mirror control switch pass the component test? Yes: GO to D4 . No: INSTALL a new exterior mirror control switch. REFER to «Removal and Installation»(ref-356023-S37264283422010013000000) . TEST the system for normal operation.
4. 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 appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.
5. 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.
6. 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: Yes: GO to D7 . 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? No: REPAIR the circuit(s). TEST the system for normal operation.
7. 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 table below: EXTERIOR MIRROR CONTROL SWITCH REFERENCE TABLE Exterior Mirror Control Switch Circuit DDM C527-2 CPM21 (YE/VT) C568A-7 C527-5 CPM17 (BU/GN) C568A-9 C527-6 CPM23 (GY) C568A-11 C527-7 CPM20 (BN/WH) C568A-8 C527-8 CPM16 (BN/BU) C568A-10 Are the resistances less than 5 ohms? Yes: GO to D29 . No: REPAIR the circuit(s). TEST the system for normal operation.
8. 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 .
9. 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.
10. 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 table below: LH EXTERIOR MIRROR REFERENCE TABLE LH Exterior Mirror Circuit DDM C522-16 RPM30 (YE) C568B-21 C522-13 LPM30 (GY/VT) C568B-9 Inoperative RH mirror: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299C, harness side using the following table below: RH EXTERIOR MIRROR REFERENCE TABLE RH Exterior Mirror Circuit DSM C626-13 LPM30 (GY/VT) C3299D-1 C626-16 RPM30 (YE) C3299D-11 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 «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new LH or RH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . TEST the system for normal operation. No: REPAIR the circuit(s). TEST the system for normal operation.
11. 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 .
12. 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 «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new LH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: GO to D13 .
13. 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 table: LH EXTERIOR MIRROR REFERENCE TABLE LH Exterior Mirror Circuit DDM C522-1 CPM29 (GN) C568B-4 C522-2 CPM27 (GY/BU) C568B-2 DTC B1668: Measure the resistance between LH exterior mirror C522, harness side and DDM C568B, harness side using the following table below LH EXTERIOR MIRROR REFERENCE TABLE LH Exterior Mirror Circuit DDM C522-3 CPM27 (GY/BU) C568B-2 C522-4 CPM28 (BU/BN) C568B-5 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.
14. 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 «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new RH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: GO to D15 .
15. 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 table below: RH EXTERIOR MIRROR REFERENCE TABLE RH Exterior Mirror Circuit DSM C626-1 CPM34 (WH/BN) C3299D-7 C626-2 CPM31 (YE/GY) C3299D-8 DTC B1670: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299D, harness side using the following table below RH EXTERIOR MIRROR REFERENCE TABLE RH Exterior Mirror Circuit DSM C626-3 CPM31 (YE/GY) C3299D-8 C626-4 CPM33 (WH/VT) C3299D-6 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.
16. D16 CHECK CIRCUITS CPM27, CPM28 (BU/BN) AND CPM29 (GN) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: DDM C568B. Ignition ON. Measure the voltage between ground and DDM : C568B-5, circuit CPM28 (BU/BN), harness side. C568B-4, circuit CPM29 (GN), harness side. C568B-2, circuit CPM27 (GY/BU), harness side. Is any voltage present? Yes: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation. No: GO to D17 .
17. D17 CHECK CIRCUITS CPM27 (GY/BU), CPM28 (BU/BN) AND CPM29 (GN) FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between ground and DDM : C568B-5, circuit CPM28 (BU/BN), harness side. C568B-4, circuit CPM29 (GN), harness side. C568B-2, circuit CPM27 (GY/BU), harness side. Are the resistances greater than 10,000 ohms? Yes: GO to D29 . No: GO to D18 .
18. D18 CHECK THE LH EXTERIOR MIRROR FOR A SHORT TO GROUND Disconnect: LH Exterior Mirror C522. Measure the resistance between ground and DDM : C568B-5, circuit CPM28 (BU/BN), harness side. C568B-4, circuit CPM29 (GN), harness side. C568B-2, circuit CPM27 (GY/BU), harness side. Are the resistances greater than 10,000 ohms? Yes: CHECK the LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for 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 exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new LH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
19. D19 CHECK CIRCUITS CPM31 (YE/GY), CPM33 (WH/VT) AND CPM34 (WH/BN) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: DSM C3299D. Ignition ON. Measure the voltage between ground and DSM : C3299D-7, circuit CPM34 (WH/BN), harness side. C3299D-8, circuit CPM31 (YE/GY), harness side. C3299D-6, circuit CPM33 (WH/VT), harness side. Is any voltage present? Yes: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation. No: GO to D20 .
20. D20 CHECK CIRCUITS CPM31 (YE/GY), CPM33 (WH/VT) AND CPM34 (WH/BN) FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between ground and DSM : C3299D-7, circuit CPM34 (WH/BN), harness side. C3299D-8, circuit CPM31 (YE/GY), harness side. C3299D-6, circuit CPM33 (WH/VT), harness side. Are the resistances greater than 10,000 ohms? Yes: GO to D28 . No: GO to D21 .
21. D21 CHECK THE RH EXTERIOR MIRROR FOR A SHORT TO GROUND Disconnect: LH Exterior Mirror C626. Measure the resistance between ground and DSM : C3299D-7, circuit CPM34 (WH/BN), harness side. C3299D-8, circuit CPM31 (YE/GY), harness side. C3299D-6, circuit CPM33 (WH/VT), harness side. Are the resistances greater than 10,000 ohms? Yes: CHECK the RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for 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 RH exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new RH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
22. D22 CHECK THE LH AND RH EXTERIOR MIRRORS Ignition OFF. Disconnect: DTC B2312 or B2316: DSM C3299D. Disconnect: DTC B2320 or B2324: DDM C568A. DTC B2312 or B2316: Measure the resistance between ground and DSM : DTC B2312: C3299D-15, circuit VPM37 (BU/OG), harness side. DTC B2316: C3299D-14, circuit VPM38 (BN/GN), harness side. DTC B2320 or B2324: Measure the resistance between ground and DDM : DTC B2320: C568A-2, circuit VPM35 (YE/BU), harness side. DTC B2324: C568A-1, circuit VPM36 (BN/YE), harness side. Is the resistance greater than 10,000 ohms? Yes: GO to D24 . No: GO to D23 .
23. D23 CHECK CIRCUITS VPM35 (YE/BU), VPM36 (BN/YE), VPM37 (BU/OG) AND VPM38 (BN/GN) FOR A SHORT TO GROUND Disconnect: DTC B2312 or B2316: RH Exterior Mirror C625. Disconnect: DTC B2320 or B2324: LH Exterior Mirror C522. DTC B2312 or B2316: Measure the resistance between ground and DSM : DTC B2312: C3299D-15, circuit VPM37 (BU/OG), harness side. DTC B2316: C3299D-14, circuit VPM38 (BN/GN), harness side. DTC B2320 or B2324: Measure the resistance between ground and DDM : DTC B2320: C568A-2, circuit VPM35 (YE/BU), harness side. DTC B2324: C568A-1, circuit VPM36 (BN/YE), harness side. Is the resistance greater than 10,000 ohms? Yes: CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for 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 RH or LH exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
24. D24 CHECK THE RH AND LH EXTERIOR MIRRORS FOR AN INTERNAL OPEN DTC B2312 or B2316: Measure the resistance between DSM C3299D-15, circuit VPM37 (BU/OG), harness side and C3299D-14, circuit VPM38 (BN/GN), harness side. DTC B2320 or B2324: Measure the resistance between DDM C568A-2, circuit VPM35 (YE/BU), harness side and C568A-1, circuit VPM36 (BN/YE), harness side. Is the resistance less than 5 ohms? Yes: For DTC B2312 or B2316, GO to D28 . For DTC B2320 or B2324, GO to D29 . No: GO to D25 .
25. D25 CHECK CIRCUITS VPM35 (YE/BU), VPM36 (BN/YE), VPM37 (BU/OG) AND VPM38 (BN/GN) FOR AN OPEN Disconnect: DTC B2312 or B2316: RH Exterior Mirror C626. Disconnect: DTC B2320 or B2324: LH Exterior Mirror C522. DTC B2312 or B2316: Measure the resistance between RH exterior mirror C626, harness side and DSM C3299D, harness side using the following table: RH EXTERIOR MIRROR REFERENCE TABLE DTC RH Exterior Mirror Circuit DSM B2312 C626-15 VPM37 (BU/OG) C3299D-15 B2316 C626-14 VPM38 (BN/GN) C3299D-14 DTC B2320 or B2324: Measure the resistance between LH exterior mirror C522, harness side and DDM C568A, harness side using the following table below: RH EXTERIOR MIRROR REFERENCE TABLE DTC RH Exterior Mirror Circuit DSM B2312 C522-15 VPM35 (YE/BU) C568A-2 B2316 C522-14 VPM36 (BN/YE) C568A-1 Is the resistance less than 5 ohms? Yes: CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for 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 RH or LH exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
26. D26 CHECK THE LH AND RH EXTERIOR MIRRORS Ignition OFF. Disconnect: DTC B2314 or B2318: DSM C3299D. Disconnect: DTC B2322 or B2326: DDM C568A. Ignition ON. DTC B2314 or B2318: Measure the voltage between ground and DSM : DTC B2314: C3299D-15, circuit VPM37 (BU/OG), harness side. DTC B2318: C3299D-14, circuit VPM38 (BN/GN), harness side. DTC B2322 or B2326: Measure the voltage between ground and DDM : DTC B2322: C568A-2, circuit VPM35 (YE/BU), harness side. DTC B2326: C568A-1, circuit VPM36 (BN/YE), harness side. Is any voltage present? Yes: GO to D27 . No: For DTC B2314 or B2318, GO to D28 . For DTC B2322 or B2326, GO to D29 .
27. D27 CHECK THE LH AND RH EXTERIOR MIRRORS Ignition OFF. Disconnect: DTC B2314 or B2318: RH Exterior Mirror C626. Disconnect: DTC B2322 or B2326: LH Exterior Mirror C522. DTC B2314 or B2318: Measure the voltage between ground and DSM : DTC B2314: C3299D-15, circuit VPM37 (BU/OG), harness side. DTC B2318: C3299D-14, circuit VPM38 (BN/GN), harness side. DTC B2322 or B2326: Measure the voltage between ground and DDM : DTC B2322: C568A-2, circuit VPM35 (YE/BU), harness side. DTC B2326: C568A-1, circuit VPM36 (BN/YE), harness side. Is any voltage present? Yes: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation. No: CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for 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 RH or LH exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «Removal and Installation»(ref-356023-S21110678972010051800000) . CLEAR the DTCs. TEST the system for normal operation.
28. D28 CHECK THE DSM FOR CORRECT OPERATION Disconnect all DSM connectors. Check for: corrosion. pushed-out pins. Connect all DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new DSM . REFER to «REMOVAL AND INSTALLATION»(ref-355947-S20159905812010013000000) . CLEAR the DTCs. REPEAT the self-test. No: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
29. D29 CHECK THE DDM FOR CORRECT OPERATION Disconnect all DDM connectors. Check for: corrosion. pushed-out pins. Connect all DDM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes: INSTALL a new DDM . REFER to «REMOVAL AND INSTALLATION»(ref-355947-S18294268812010013000000) . CLEAR the DTCs. REPEAT the self-test. No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Under normal operation, the LH and RH exterior mirror glass receives power from Power Distribution Box (PDB) fuse 38 (10A) and through circuit CBB38 (GY/BU), when the rear window defrost system is on. Ground is supplied to the LH heated exterior mirror glass through circuit GD126 (BK/WH) and to the RH heated exterior mirror glass through circuit GD139 (BK/YE).

This pinpoint test is intended to diagnose the following

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

Scheme 38

Scheme 39

1. E1 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM Ignition ON. Press 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 E2 . No: REFER to «GLASS, FRAMES AND MECHANISMS»(ref-356015-S13501502462010013000000) to diagnose the rear window defrost system.
2. E2 CHECK THE VOLTAGE TO THE EXTERIOR MIRRORS Ignition OFF. Disconnect: LH Exterior Mirror C517 (without memory mirrors)/C522 (with memory mirrors) or RH Exterior Mirror C625 (without memory mirrors)/C626 (with memory mirrors). Ignition ON. Press the rear window defrost switch to the ON position. Without memory mirrors: Measure the voltage between ground and inoperative exterior mirror: LH: C517-5, circuit CBB38 (GY/BU), harness side. RH: C625-5, circuit CBB38 (GY/BU0), harness side. Yes: GO to E3 . No: VERIFY that PDB fuse 38 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation. With memory mirrors: Measure the voltage between ground and inoperative exterior mirror: LH: C522-6, circuit CBB38 (BU/OG), harness side. RH: C626-6, circuit CBB38 (GY/BU), harness side. Is the voltage greater than 10 volts?
3. E3 CHECK THE EXTERIOR REAR VIEW MIRROR GROUND CIRCUIT FOR AN OPEN

Scheme 40

Scheme 41

1. Ignition OFF.
2. Without memory mirrors: Measure the resistance between ground and inoperative exterior mirror: LH: C517-6, circuit GD126 (BK/WH), harness side. RH: C625-6, circuit GD139 (BK/YE), harness side.
3. With memory mirrors: Measure the resistance between ground and inoperative exterior mirror: LH: C522-7, circuit GD126 (BK/WH), harness side. RH: C626-7, circuit GD139 (BK/YE), harness side.
4. Is the resistance less than 5 ohms?

1. Yes: CHECK the LH or 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 LH or RH exterior mirror. REFER to «Removal and Installation»(ref-356023-S16116166512010013000000) . If the jumper harness is OK, INSTALL a new LH or RH exterior mirror glass. REFER to «Installation»(ref-356023-S19047581902010013000000) . TEST the system for normal operation.
2. No: REPAIR the circuit. TEST the system for normal operation.

Under normal operation, the interior auto-dimming mirror receives voltage from Smart Junction Box (SJB) fuse 41 (15A) through circuit CBP41 (BU) and ground from circuit GD139 (BK/YE). If equipped with a LH exterior auto-dimming mirror, and the auto-dimming feature is activated, voltage is sent from the interior mirror to the LH exterior mirror though circuit LRD12 (BU/GY). Ground for the LH exterior mirror is provided by the interior mirror through circuit RRD12 (BN). When the vehicle is placed in REVERSE, voltage is sent to the interior mirror through circuit CLS10 (GN/BN) and the interior mirror will turn the dimming feature off. 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 mirror might not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose 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
4. LH exterior mirror glass
5. LH exterior mirror