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Rear View Mirror: Diagnosis Ford Flex I

Mirrors 36 illustrations ~6009 words

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage. Visual Inspection Chart VISUAL INSPECTION CHART Mechanical Electrical Exterior mirror Exterior mirror control switch Exterior mirror cover Battery Junction Box (BJB) fuse 49 (10A) Smart Junction Box (SJB) fuse 13 (5A) Driver Seat Module (DSM) Exterior mirror Exterior mirror control switch Exterior mirror glass Exterior mirror motor Loose or corroded connections Wiring harness
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. NOTE: Make sure to use the latest scan tool software release. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
  5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM . If the scan tool does not communicate with the VCM : check the VCM connection to the vehicle. check the scan tool connection to the VCM . Refer to «MODULE COMMUNICATIONS NETWORK»(ref-372772) , No Power To The Scan Tool, to diagnose no power to the scan tool.
  6. If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. Refer to «MODULE COMMUNICATIONS NETWORK»(ref-372772) to diagnose no response from the DSM .
  7. Carry out the network test. If the scan tool responds with no communication from one or more modules, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-372772) . If the network test passes, retrieve and record the Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the DSM .
  9. If the DTCs retrieved are related to the concern, go to the Driver Seat Module (DSM) DTC Chart in «DTC Chart»(ref-372791-S18573539752010093000000) . For all other DTCs, Refer to «MULTIFUNCTION ELECTRONIC MODULES»(ref-372773) .
  10. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART - EXTERIOR MIRRORS»(ref-372791-S24830055482010093000000) or GO to «SYMPTOM CHART - NVH»(ref-372791-S29240779022010093000000) .

DTC Chart

Driver Seat Module (DSM) DTC Chart

DTCDescriptionAction
B1667Mirror Driver Up/Down Motor StalledGO to PINPOINT TEST E .
B1668Mirror Driver Right/Left Motor StalledGO to PINPOINT TEST E .
B1669Mirror Passenger Up/Down Motor StalledGO to PINPOINT TEST E .
B1670Mirror Passenger Right/Left Motor StalledGO to PINPOINT TEST E .
B1733Mirror Driver Vertical Switch Circuit FailureGO to PINPOINT TEST E .
B1737Mirror Driver Horizontal Switch Circuit FailureGO to PINPOINT TEST E .
B1741Mirror Passenger Vertical Switch Circuit FailureGO to PINPOINT TEST E .
B1745Mirror Passenger Horizontal Switch Circuit FailureGO to PINPOINT TEST E .
B2223Mirror Driver Drive Circuit FailureGO to PINPOINT TEST E .
B2224Mirror Passenger Drive Circuit FailureGO to PINPOINT TEST E .
B2312Mirror Passenger Horizontal Feedback Potentiometer Circuit FailureGO to PINPOINT TEST E .
B2314Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to BatteryGO to PINPOINT TEST E .
B2316Mirror Passenger Vertical Feedback Potentiometer Circuit FailureGO to PINPOINT TEST E .
B2318Mirror Passenger Vertical Feedback Potentiometer Circuit Short to BatteryGO to PINPOINT TEST E .
B2320Mirror Driver Horizontal Feedback Potentiometer Circuit FailureGO to PINPOINT TEST E .
B2322Mirror Driver Horizontal Feedback Potentiometer Circuit Short to BatteryGO to PINPOINT TEST E .
B2324Mirror Driver Vertical Feedback Potentiometer Circuit FailureGO to PINPOINT TEST E .
B2326Mirror Driver Vertical Feedback Potentiometer Circuit Short to BatteryGO to PINPOINT TEST E .
All other DTCsREFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES .

DRIVER SEAT MODULE (DSM) DTC CHART

Symptom Chart - Exterior Mirrors

ConditionPossible SourcesAction
The mirrors are inoperative - puddle lampsFuse Circuitry Exterior mirrorsRefer to EXTERIOR LIGHTING .
The mirrors are inoperative - non-memory mirrorsFuse Circuitry Exterior mirror control switchGO to PINPOINT TEST A .
A single mirror is inoperative - non-memory mirrorsCircuitry Exterior mirror control switch Exterior mirror motor Exterior mirrorGO to PINPOINT TEST B .
A single mirror does not operate correctly - non-memory mirrorsCircuitry Exterior mirror control switch Exterior mirror motor Exterior mirrorGO to PINPOINT TEST C .
The heated exterior mirrors do not operate correctly - RH and LH do not defrost at the same rateNormal operation of heated exterior mirrorsNo action required. System operating correctly at this time.
The heated exterior mirror is inoperativeFuse Circuitry Exterior mirror glass Exterior mirrorGO to PINPOINT TEST D .
The memory mirror is inoperativeFuse Circuitry Exterior mirror control switch Exterior mirror motor Exterior mirror Driver Seat Module (DSM)GO to PINPOINT TEST E .

SYMPTOM CHART - EXTERIOR MIRRORS

Symptom Chart - NVH

Note. NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, Refer to NOISE, VIBRATION AND HARSHNESS . Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, refer back to NOISE, VIBRATION AND HARSHNESS for the next likely system and continue diagnosis.

ConditionPossible SourcesAction
Exterior mirror vibrates/looseExterior mirror mounting nuts loose Exterior mirror glass loose Aftermarket air deflector/stone shieldsTIGHTEN the exterior mirror fasteners to the specified value located in the Specifications table. PRESS the center of the exterior mirror glass up, down, left and right to make sure that the exterior mirror glass is seated correctly. If the exterior mirror glass is still loose, REMOVE the exterior mirror glass and INSPECT the exterior mirror backing plate for damage. If the exterior mirror backing plate is damaged, INSTALL a new exterior mirror glass. REFER to EXTERIOR MIRROR GLASS . If possible, REMOVE aftermarket air deflector/stone shield, then ROAD TEST the vehicle. If concern is no longer present, ADVISE customer that aftermarket components were causing undesired vibration.
Wind noiseFoam gasket between the exterior mirror and door frame is missing or damaged Exterior mirror is not correctly fitted to the door Exterior mirror coverVERIFY that the foam gasket is present and in good condition. If necessary, REPOSITION the foam gasket between the exterior mirror and door frame. VERIFY that there are no gaps between the exterior mirror and the door. If necessary, LOOSEN the exterior mirror nuts and REPOSITION the exterior mirror. VERIFY that the exterior mirror cover is not loose or broken. If necessary, INSTALL a new exterior mirror cover. REFER to EXTERIOR MIRROR COVER .

SYMPTOM CHART - NVH

Pinpoint Test A: The Mirrors are Inoperative - Non-Memory Mirrors

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 1

Scheme 1: PINPOINT TEST A: THE MIRRORS ARE INOPERATIVE - NON-MEMORY MIRRORS
Scheme 1: PINPOINT TEST A: THE MIRRORS ARE INOPERATIVE - NON-MEMORY MIRRORS

Scheme 2

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Scheme 4
Scheme 4
  1. A1 CHECK THE EXTERIOR MIRROR CONTROL SWITCH Disconnect: Exterior Mirror Control Switch C527. Carry out the Exterior Mirror Control Switch component test. Refer to «COMPONENT TESTING»(ref-357210) for component testing. Did the exterior mirror control switch pass the component test? Yes: GO to A2 . No: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation.
  2. A2 CHECK THE VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH - CIRCUIT SBP13 (GY/RD) Ignition ON. Measure the voltage between exterior mirror control switch C527-3, circuit SBP13 (GY/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to A3 . No: VERIFY Smart Junction Box (SJB) fuse 13 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
  3. A3 CHECK CIRCUIT GD133 (BK) FOR AN OPEN Ignition OFF. Measure the resistance between exterior mirror control switch C527-1, circuit GD133 (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 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 A5 .
  5. A5 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: REPAIR the open in circuit CPM23 (GY). TEST the system for normal operation. No: REPAIR the short in circuit CPM23 (GY). TEST the system for normal operation.

Pinpoint Test B: A Single Mirror is Inoperative - Non-Memory Mirrors

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 5

Scheme 5: PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE - NON-MEMORY MIRRORS
Scheme 5: PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE - NON-MEMORY MIRRORS
  1. B1 CHECK THE LH MIRROR OPERATION Operate the LH exterior mirror using the exterior mirror control switch. Does the LH exterior mirror operate? Yes: GO to B2 . No: GO to B4 .
  2. B2 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»(ref-357210) for component testing. Did the exterior mirror control switch pass the component test? Yes: GO to B3 . No: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation.
  3. B3 CHECK CIRCUIT CPM23 (GY) FOR AN OPEN Disconnect: RH Exterior Mirror C625. Measure the resistance between RH exterior mirror C625-2, circuit CPM23 (GY), the harness side and exterior mirror control switch C527-6, circuit CPM23 (GY), harness side. Is the resistance less than 5 ohms? Yes: CHECK the RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor 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 RH exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.
  4. B4 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»(ref-357210) for component testing. Did the exterior mirror control switch pass the component test? Yes: GO to B5 . No: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation.
  5. B5 CHECK CIRCUIT CPM23 (GY) FOR AN OPEN Disconnect: LH Exterior Mirror C516. Measure the resistance between LH exterior mirror C516-2, circuit CPM23 (GY), harness side and exterior mirror control switch C527-6, circuit CPM23 (GY), harness side. Is the resistance less than 5 ohms? Yes: CHECK the LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.

Pinpoint Test C: A Single Mirror Does Not Operate Correctly - Non-Memory Mirrors

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 6

Scheme 6: PINPOINT TEST C: A SINGLE MIRROR DOES NOT OPERATE CORRECTLY - NON-MEMORY MIRRORS
Scheme 6: PINPOINT TEST C: A SINGLE MIRROR DOES NOT OPERATE CORRECTLY - NON-MEMORY MIRRORS

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Scheme 9
  1. C1 CHECK THE MIRROR MOVEMENT (RIGHT/LEFT) Operate the RH and LH exterior mirrors in the right and left direction using the exterior mirror control switch. Do the exterior mirrors move left and right? Yes: GO to C2 . No: GO to C3 .
  2. C2 CHECK THE MIRROR MOVEMENT (UP/DOWN) Operate the RH and LH exterior mirrors in the up and down direction using the exterior mirror control switch. Do the exterior mirrors move up and down? Yes: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation. No: GO to C4 .
  3. C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR Ignition OFF. Disconnect: Inoperative Exterior Mirror C516 (LH) or C625 (RH). Ignition ON. NOTE: Position the exterior mirror control switch to the LH or RH mirror position. While operating the exterior mirror control switch in the rightward position, measure the voltage between ground and exterior mirror: LH exterior mirror: C516-4, circuit CPM16 (BN/BU), harness side. RH exterior mirror: C625-4, circuit CPM20 (BN/WH), harness side. Is the voltage greater than 10 volts? Yes: CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor 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 RH or LH exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . TEST the system for normal operation. No: GO to C5 .
  4. C4 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR Disconnect: Inoperative Exterior Mirror C516 (LH) or C625 (RH). Ignition ON. NOTE: Position the exterior mirror control switch to the LH or RH mirror position. While operating the exterior mirror control switch in the upward position, measure the voltage between ground and exterior mirror: LH exterior mirror: C516-1, circuit CPM17 (BU/GN), harness side. RH exterior mirror: C625-1, circuit CPM21 (YE/VT), harness side. Is the voltage greater than 10 volts? Yes: CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor 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 RH or LH exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . TEST the system for normal operation. No: GO to C6 .
  5. C5 CHECK CIRCUIT CPM16 (BN/BU) OR CPM20 (BN/WH) FOR AN OPEN Ignition OFF. Disconnect: Exterior Mirror Control Switch C527. LH exterior mirror: Measure the resistance between exterior mirror control switch C527-8, circuit CPM16 (BN/BU), harness side and LH exterior mirror C516-4, circuit CPM16 (BN/BU), harness side. RH exterior mirror: Measure the resistance between exterior mirror control switch C527-7, circuit CPM20 (BN/WH), harness side and RH exterior mirror C625-4, circuit CPM20 (BN/WH), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK CIRCUIT CPM17 (BU/GN) OR CPM21 (YE/VT) FOR AN OPEN Ignition OFF. Disconnect: Exterior Mirror Control Switch C527. LH exterior mirror: Measure the resistance between LH exterior mirror C516-1, circuit CPM17 (BU/GN), harness side and exterior mirror control switch C527-5, circuit CPM17 (BU/GN), harness side. RH exterior mirror: Measure the resistance between RH exterior mirror C625-1, circuit CPM21 (YE/VT), harness side and exterior mirror control switch C527-2, circuit CPM21 (YE/VT), harness side. Is the resistance less than 5 ohms? Yes: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.

Pinpoint Test D: The Heated Exterior Mirror is Inoperative

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 10

Scheme 10: PINPOINT TEST D: THE HEATED EXTERIOR MIRROR IS INOPERATIVE
Scheme 10: PINPOINT TEST D: THE HEATED EXTERIOR MIRROR IS INOPERATIVE

Scheme 11

Scheme 11
Scheme 11
  1. D1 CHECK FOR OPERATION OF THE HEATED EXTERIOR MIRROR GLASS Ignition ON. With the engine running, depress the rear window defrost switch to the ON position. Using a infrared temperature gun, measure the temperature of the exterior mirror glass for approximately 30 seconds noting changes in temperature. Does the temperature of the exterior glass rise? Yes: The system is operating correctly at this time. No: GO to D2 .
  2. D2 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM Using an infrared temperature gun, measure the temperature of the rear window for approximately 30 seconds noting changes in temperature. Does the temperature of the rear window rise? Yes: GO to D3 . No: Refer to «GLASS, FRAMES AND MECHANISMS»(ref-372821) to diagnose the rear window defrost system.
  3. D3 CHECK THE VOLTAGE TO THE EXTERIOR MIRRORS Ignition OFF. Disconnect: Exterior Mirror C516 (LH) and C625 (RH). Ignition ON. With the engine running, depress the heated rear window switch to ON. Measure the voltage between ground and exterior mirror: LH exterior mirror: C516-6, circuit CRD13 (GN/VT), harness side. RH exterior mirror: C625-6, circuit CRD13 (GN/VT), harness side. Is the voltage greater than 10 volts? Yes: GO to D4 . No: VERIFY that BJB fuse 49 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
  4. D4 CHECK THE EXTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN Ignition OFF. Measure the resistance between ground and exterior mirror: LH exterior mirror: C516-7, circuit GD133 (BK), harness side. RH exterior mirror: C625-7, circuit GD145 (BK/BU), harness side. 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 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror glass. REFER to «EXTERIOR MIRROR GLASS»(ref-372791-S17569002152010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.

Pinpoint Test E: The Memory Mirror is Inoperative

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 12

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Scheme 27
  1. E1 RETRIEVE THE DTCs FROM THE DSM Use the recorded DSM DTCs from the continuous and on-demand self tests. Are any DTCs retrieved? Yes: 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 E12 . If DTC B1669 or B1670 - If other DTCs are present, DIAGNOSE them first. If no other DTCs are present, INSPECT the exterior mirror motor for foreign material, damage or a binding condition. If no condition is found, GO to E14 . If DTC B1733, B1737, B1741 or B1745 - CARRY OUT the Exterior Mirror Control Switch Component Test. Refer to «COMPONENT TESTING»(ref-357210) for component testing. If the switch tests OK, GO to E16 . If DTC B2223, GO to E17 . If DTC B2224, GO to E19 . If DTC B2312, B2316, B2320 or B2324, GO to E21 . If DTC B2314, B2318, B2322 or B2326, GO to E23 . No: GO to E2 .
  2. E2 CHECK OPERATION OF THE MIRRORS FROM THE EXTERIOR MIRROR CONTROL SWITCH Operate the mirrors using the exterior mirror control switch. Do the LH or RH mirrors operate momentarily using the exterior mirror control switch? Yes: GO to E9 . No: GO to E3 .
  3. E3 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»(ref-357210) for component testing. Did the exterior mirror control switch pass the component test? Yes: GO to E4 . No: INSTALL a new exterior mirror control switch. REFER to «EXTERIOR MIRROR CONTROL SWITCH»(ref-372791-S10915967632010093000000) . TEST the system for normal operation.
  4. E4 CHECK CIRCUIT SBP13 (GY/RD) FOR VOLTAGE Disconnect: Exterior Mirror Control Switch C527. Measure the voltage between exterior mirror control switch C527-3, circuit SBP13 (GY/RD), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to E5 . No: VERIFY that Smart Junction Box (SJB) fuse 13 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
  5. E5 CHECK CIRCUIT GD133 (BK) FOR AN OPEN Measure the resistance between exterior mirror control switch C527-1, circuit GD133 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to E6 . No: REPAIR the circuit. TEST the system for normal operation.
  6. E6 CHECK CIRCUIT CPM23 (GY) FOR A SHORT TO VOLTAGE Ignition ON. Disconnect: DSM C341D. 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 E7 .
  7. E7 CHECK CIRCUIT CPM23 (GY) FOR A SHORT TO GROUND 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 E8 . No: REPAIR the circuit. TEST the system for normal operation.
  8. E8 CHECK CIRCUITS RPM11 (YE/OG) AND CPM23 (GY) FOR AN OPEN Measure the resistance between DSM C341D-16, circuit RPM11 (YE/OG), harness side and exterior mirror control switch C527-6, circuit CPM23 (GY), harness side. Is the resistance less than 5 ohms? Yes: GO to E24 . No: REPAIR the circuit. TEST system for normal operation.
  9. E9 CHECK CIRCUIT RPM30 (YE) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Exterior Mirror C516 and C625. Disconnect: DSM C341D. Ignition ON. Measure the voltage between DSM C341D-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 E10 .
  10. E10 CHECK CIRCUIT LPM30 (GY/VT) FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between DSM C341D-1, circuit LPM30 (GY/VT), harness side and ground. Is the resistance greater than 10,000 ohms? Yes: GO to E11 . No: REPAIR the circuit. TEST the system for normal operation.
  11. E11 CHECK CIRCUITS RPM30 (YE) AND LPM30 (GY/VT) FOR AN OPEN Measure the resistance between DSM C341D, harness side and exterior mirror C516 (LH)/625 (RH), harness side using the following chart: RESISTANCE REFERENCE CHART DSM Circuit Exterior Mirror C341D-1 LPM30 (GY/VT) C516-10 C341D-11 RPM30 (YE) C516-12 C341D-1 LPM30 (GY/VT) C625-10 C341D-11 RPM30 (YE) C625-12 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 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). TEST the system for normal operation.
  12. E12 CHECK THE LH EXTERIOR MIRROR FOR VOLTAGE FROM THE DSM Ignition OFF. Disconnect: LH Exterior Mirror C516. Ignition ON. Enter the following diagnostic mode on the scan tool: DataLogger - DSM . DTC B1667: Measure the voltage between ground and LH exterior mirror: C516-1, circuit CPM29 (GN), harness side while toggling the LH exterior mirror DSM PID DR_UP to On. C516-2, circuit CPM26 (WH), harness side while toggling the LH exterior mirror DSM PID DR_DOWN to On. DTC B1668: Measure the voltage between ground and LH exterior mirror: C516-2, circuit CPM26 (WH), harness side while toggling the LH exterior mirror DSM PID DR_LEFT to On. C516-4, circuit CPM28 (BU/BN), harness side while toggling the LH exterior mirror DSM 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 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»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new LH exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. REPEAT the self-test. No: GO to E13 .
  13. E13 CHECK CIRCUITS CPM26 (WH), CPM28 (BU/BN) AND CPM29 (GN) FOR AN OPEN Ignition OFF. Disconnect: DSM C341D. Measure the resistance between LH Exterior Mirror C516, harness side and DSM C341D, harness side using the following chart: RESISTANCE REFERENCE CHART DTC LH Exterior Mirror Circuit DSM B1667 C516-1 CPM29 (GN) C341D-4 B1667 and B1668 C516-2 CPM26 (WH) C341D-2 B1668 C516-4 CPM28 (BU/BN) C341D-5 Are the resistances less than 5 ohms? Yes: GO to E24 . No: REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.
  14. E14 CHECK THE RH EXTERIOR MIRROR FOR VOLTAGE FROM THE DSM Ignition OFF. Disconnect: RH Exterior Mirror C625. Ignition ON. Enter the following diagnostic mode on the scan tool: DataLogger - DSM . DTC B1669: Measure the voltage between ground and RH exterior mirror: C625-1, circuit CPM34 (WH/BN), harness side while toggling the RH exterior mirror DSM PID PR_UP to On. C625-2, circuit CPM31 (YE/GY), harness side while toggling the RH exterior mirror DSM PID PR_DOWN to On. DTC B1670: Measure the voltage between ground and RH exterior mirror: C625-2, circuit CPM31 (YE/GY), harness side while toggling the RH exterior mirror DSM PID PR_LEFT to On. C625-4, circuit CPM33 (WH/VT), harness side 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 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»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new RH exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. REPEAT the self-test. No: GO to E15 .
  15. E15 CHECK CIRCUITS CPM31 (YE/GY), CPM33 (WH/VT) AND CPM34 (WH/BN) FOR AN OPEN Ignition OFF. Disconnect: DSM C341D. Measure the resistance between RH exterior mirror C625, harness side and DSM C341D, harness side using the following chart: RESISTANCE REFERENCE CHART DTC RH Exterior Mirror Circuit DSM B1669 C625-1 CPM34 (WH/BN) C341D-7 B1669 and B1670 C625-2 CPM31 (YE/GY) C341D-8 B1670 C625-4 CPM33 (WH/VT) C341D-6 Are the resistances less than 5 ohms? Yes: GO to E24 . No: REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.
  16. E16 CHECK CIRCUITS CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH) AND CPM21 (YE/VT) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: Exterior Mirror Control Switch C527. Disconnect: DSM C341D. 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. C527-7, 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 E24 .
  17. E17 CHECK CIRCUITS CPM26 (WH), CPM28 (BU/BN) AND CPM29 (GN) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: LH Exterior Mirror C516. Disconnect: DSM C341D. Ignition ON. Measure the voltage between ground and DSM : C341D-2, circuit CPM26 (WH), harness side. C341D-4, circuit CPM29 (GN), harness side. C341D-5, circuit CPM28 (BU/BN), harness side. Is any voltage present? Yes: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation. No: GO to E18 .
  18. E18 CHECK CIRCUITS CPM26 (WH), CPM28 (BU/BN) AND CPM29 (GN) FOR A SHORT TO GROUND Ignition OFF. Measure the resistance between ground and DSM : C341D-2, circuit CPM26 (WH), harness side. C341D-4, circuit CPM29 (GN), harness side. C341D-5, circuit CPM28 (BU/BN), 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 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
  19. E19 CHECK CIRCUITS CPM31 (YE/GY), CPM33 (WH/VT) AND CPM34 (WH/BN) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: RH Exterior Mirror C625. Disconnect: DSM C341D. Ignition ON. Measure the voltage between ground and DSM : C341D-6, circuit CPM33 (WH/VT), harness side. C341D-7, circuit CPM34 (WH/BN), harness side. C341D-8, circuit CPM31 (YE/GY), harness side. Is any voltage present? Yes: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation. No: GO to E20 .
  20. E20 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 : C341D-6, circuit CPM33 (WH/VT), harness side. C341D-7, circuit CPM34 (WH/BN), harness side. C341D-8, circuit CPM31 (YE/GY), 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 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
  21. E21 CHECK CIRCUITS VPM35 (YE/BU), VPM36 (BN/YE), VPM37 (BU/OG) AND VPM38 (BN/GN) FOR AN OPEN Ignition OFF. Disconnect: DTC B2320 or B2324: Exterior Mirror C516. Disconnect: DTC B2312 or B2316: Exterior Mirror C625. Disconnect: DSM C341D. Measure the resistance between DSM C3299D, harness side and exterior mirror C516 (LH)/C625 (RH), harness side using the following chart: RESISTANCE REFERENCE CHART DTC DSM Circuit Exterior Mirror DTC B2312 C341D-15 VPM37 (BU/OG) C625-11 DTC B2316 C341D-14 VPM38 (BN/GN) C625-9 DTC B2320 C341D-12 VPM36 (BN/YE) C516-9 DTC B2324 C341D-13 VPM35 (YE/BU) C516-11 Are the resistances less than 5 ohms? Yes: GO to E22 . No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
  22. E22 CHECK CIRCUITS VPM35 (YE/BU), VPM36 (BN/YE), VPM37 (BU/OG) AND VPM38 (BN/GN) FOR A SHORT TO GROUND Measure the resistance between ground and DSM : DTC B2312: C341D-15, circuit VPM37 (BU/OG), harness side. DTC B2316: C341D-14, circuit VPM38 (BN/GN), harness side. DTC B2320: C341D-13, circuit VPM35 (YE/BU), harness side. DTC B2324: C341D-12, circuit VPM36 (BN/YE), harness side. Are the resistances greater than 10,000 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. TEST the system for normal operation. No: REPAIR the circuit(s). CLEAR the DTCs. TEST the system for normal operation.
  23. E23 CHECK CIRCUITS VPM35 (YE/BU), VPM36 (BN/YE), VPM37 (BU/OG) AND VPM38 (BN/GN) FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: DTC B2322 or B2326: Exterior Mirror C516. Disconnect: DTC B2314 or B2318: Exterior Mirror C625. Disconnect: DSM C341D. Ignition ON. Measure the voltage between ground and DSM : DTC B2314: C341D-15, circuit VPM37 (BU/OG), harness side. DTC B2318: C341D-14, circuit VPM38 (BN/GN), harness side. DTC B2322: C341D-13, circuit VPM35 (YE/BU), harness side. DTC B2326: C341D-12, 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 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 exterior mirror. REFER to «EXTERIOR MIRROR»(ref-372791-S38923091632010093000000) . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to «EXTERIOR MIRROR MOTOR»(ref-372791-S09163423582010093000000) . CLEAR the DTCs. TEST the system for normal operation.
  24. E24 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 «MULTIFUNCTION ELECTRONIC MODULES»(ref-372773) . 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.

Pinpoint Test E

E2 Visual Inspection Chart
  1. Visual Inspection Chart
  2. VISUAL INSPECTION CHART Mechanical Electrical Interior rear view mirror Smart Junction Box (SJB) fuse 41 (15A) Circuitry Interior auto-dimming rear view mirror Loose or corroded connections

Symptom Chart - Interior Mirror

ConditionPossible SourcesAction
The interior mirror is blemishedInterior mirror glass/housing is dirty The interior mirror is damagedNOTE: Do not clean the housing or glass of any mirror with harsh abrasives, fuel or other petroleum-based cleaning products. CLEAN the affected interior mirror surface. INSPECT the interior mirror damage. If needed, REPLACE the interior mirror. REFER to the REAR VIEW MIRRORS - INTERIOR or AUTO-DIMMING INTERIOR MIRROR .
The auto-dimming mirror does not operate correctlyObstructed rearward-facing sensor: stickers, window decals, tags non-OEM window tinting Obstructed forward-facing sensor: stickers, window decals, tags non-OEM window tinting Light source near or inside of vehicle Vehicle inside garage or tunnel Fuse Circuitry Interior auto-dimming mirrorIf possible, REMOVE the obstruction. If the obstruction cannot be removed, GO to PINPOINT TEST F to test the auto-dimming mirror for correct function. None. Any light source the rearward-facing sensor is exposed to can be considered glare. None. Ambient conditions are similar to nighttime conditions. GO to PINPOINT TEST F .
Interior mirror microphone concernsGO to INFORMATION AND ENTERTAINMENT SYSTEMS .
Interior mirror compass concernsGO to ELECTRONIC COMPASS .
NOTE
Do not clean the housing or glass of any mirror with harsh abrasives, fuel or other petroleum-based cleaning products.

SYMPTOM CHART - INTERIOR MIRROR

Note. NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, Refer to NOISE, VIBRATION AND HARSHNESS . Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, refer back to NOISE, VIBRATION AND HARSHNESS for the next likely system and continue diagnosis.

ConditionPossible SourcesAction
The interior mirror vibrates/looseInterior mirror mounting looseREMOVE the interior mirror. REFER to AUTO-DIMMING INTERIOR MIRROR . INSPECT the interior mirror mount for damage. INSTALL the interior mirror, making sure that it is fully seated.

SYMPTOM CHART - NVH

Pinpoint Test F: The Auto-Dimming Mirror Does Not Operate Correctly

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Note. Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. If the Transmission Range (TR) sensor is malfunctioning and the backup lamps are on all the time or do not turn on, the interior auto-dimming mirror will not darken or return to normal view.

Scheme 28

Scheme 28: PINPOINT TEST F: THE AUTO-DIMMING MIRROR DOES NOT OPERATE CORRECTLY
Scheme 28: PINPOINT TEST F: THE AUTO-DIMMING MIRROR DOES NOT OPERATE CORRECTLY

Scheme 29

Scheme 29
Scheme 29

Scheme 30

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Scheme 31

Scheme 31
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Scheme 32

Scheme 32
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Scheme 33

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Scheme 34

Scheme 34
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Scheme 35

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Scheme 36

Scheme 36
Scheme 36
  1. F1 CHECK OPERATION OF THE BACKUP LAMPS Ignition ON. Move the shift control selector through the entire range. Do the backup lamps illuminate only in REVERSE? Yes: GO to F2 . No: Refer to «EXTERIOR LIGHTING»(ref-372775) to diagnose the backup lamps.
  2. F2 VERIFY THE FORWARD AND REARWARD FACING SENSORS ARE NOT BLOCKED Visually verify the forward and rearward facing sensors are not blocked. Sources of blockage can include: stickers, window decals or tags. fold-down screens for TVs or DVD players. non-OEM window tinting. Were either of the sensors blocked? Yes: If possible, REMOVE the blockage. TEST the system for normal operation. If it is not possible to remove the blockage, REVIEW the operation of the interior auto-dimming mirror with the customer. No: GO to F3 .
  3. F3 CHECK OPERATION OF THE AUTO-DIMMING INTERIOR MIRROR - DAYLIGHT CONDITIONS Ignition ON. Use a bright lamp to illuminate the forward facing sensor and the rearward facing sensor. The mirror should adjust to a high reflectance mode (mirror will be clear). Did the mirror adjust to the high reflectance (clear) mode? Yes: GO to F4 . No: INSTALL a new interior auto-dimming mirror. REFER to «AUTO-DIMMING INTERIOR MIRROR»(ref-372791-S08660169652010093000000) . TEST the system for normal operation.
  4. F4 CHECK THE OPERATION OF THE AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITHOUT GLARE Ignition ON. NOTE: Covering the sensor with a finger or hand is not adequate. Simulate nighttime conditions without glare: cover the forward sensor with black electrical tape or other dark material. cover the rearward facing sensor. The mirror should adjust to the high reflectance mode. Did the mirror adjust to the high reflectance (clear) mode? Yes: GO to F5 . No: GO to F7 .
  5. F5 CHECK THE OPERATION OF THE AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITH GLARE Ignition ON. NOTE: Covering the sensor with a finger or hand is not adequate. Simulate nighttime conditions with glare: cover the forward sensor with black electrical tape or other dark material. illuminate the rearward facing sensor. The mirror should darken to a lower reflectance mode. Did the mirror darken to a lower reflectance (darker) mode? Yes: GO to F6 . No: GO to F7 .
  6. F6 CHECK THE OPERATION OF THE AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITH THE VEHICLE IN REVERSE Ignition ON. NOTE: Covering the sensor with a finger or hand is not adequate. Simulate nighttime conditions with glare: cover the forward sensor with black electrical tape or other dark material. illuminate the rearward facing sensor. Select REVERSE. Did the mirror adjust to a high reflectance (clear) mode? Yes: The system is operating correctly at this time. REVIEW the operation of the interior auto-dimming interior mirror with the customer. No: GO to F7 .
  7. F7 CHECK CIRCUIT CBP41 (BU) FOR VOLTAGE Ignition OFF. Disconnect: Interior Auto-Dimming Mirror C911 (without microphone). Disconnect: Interior Auto-Dimming Mirror C9012 (with microphone). Ignition ON. Without microphone: Measure the voltage between interior auto-dimming mirror C911-1, circuit CBP41 (BU), harness side and ground. With microphone: Measure the voltage between interior auto-dimming mirror C9012-1, circuit CBP41 (BU), harness side and ground. Is the voltage greater than 10 volts? Yes: GO to F8 . No: VERIFY that Smart Junction Box (SJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the «SYSTEM WIRING DIAGRAMS»(ref-360982) to identify the possible causes of the circuit short. TEST the system for normal operation.
  8. F8 CHECK CIRCUIT GD133 (BK) FOR AN OPEN Ignition OFF. Without microphone: Measure the resistance between interior auto-dimming mirror C911-3, circuit GD133 (BK), harness side and ground. With microphone: Measure the resistance between interior auto-dimming mirror C9012-10, circuit GD133 (BK), harness side and ground. Is the resistance less than 5 ohms? Yes: GO to F9 . No: REPAIR the circuit. TEST the system for normal operation.
  9. F9 CHECK CIRCUIT CLS10 (GN/BN) FOR VOLTAGE Ignition ON. Select REVERSE. Without microphone: Measure the voltage between interior auto-dimming mirror C911-2, circuit CLS10 (GN/BN), harness side and ground. With microphone: Measure the voltage between interior auto-dimming mirror C9012-3, circuit CLS10 (GN/BN), harness side and ground. Is the voltage greater than 10 volts? Yes: INSTALL a new interior auto-dimming mirror. REFER to «AUTO-DIMMING INTERIOR MIRROR»(ref-372791-S08660169652010093000000) . TEST the system for normal operation. No: REPAIR the circuit. TEST the system for normal operation.

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