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Contents Wiring diagrams Section: Mirrors All sections

Mirror System Buick LaCrosse II

Mirrors 9 illustrations ~7521 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Inside Rearview Mirror Fastener2 N.m18 lb in
Outside Rearview Mirror Motor Fastener5 N.m44 lb in
Outside Rearview Mirror Fastener10 N.m89 lb in

Fastener Tightening Specifications

Adhesives, Fluids, Lubricants, and Sealers

ApplicationType of MaterialGM Part Number
United StatesCanada
Inside Mirror Adhesive KitAdhesive8902132989020893

Adhesives, Fluids, Lubricants, and Sealers

Scheme 1

Scheme 1: Inside Rearview Mirror
Scheme 1: Inside Rearview Mirror

Scheme 2

Scheme 2: Driver Position (A45)
Scheme 2: Driver Position (A45)

Scheme 3

Scheme 3: Passenger Position (A45)
Scheme 3: Passenger Position (A45)

Scheme 4

Scheme 4: Driver And Passenger Position (Without A45)
Scheme 4: Driver And Passenger Position (Without A45)

Scheme 5

Scheme 5: Heated Mirrors And Automatic Day/Night Mirror (DLG)
Scheme 5: Heated Mirrors And Automatic Day/Night Mirror (DLG)

Diagnostic Code Index

DTCDescription
DTC B154A or B154BDTC B154A 39 Driver Mirror Internal Malfunction DTC B154B 39 Passenger Mirror Internal Malfunction

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B154A 39

The outside mirror switch has determined that a hardware or software error has occurred.

B154B 39

The passenger window switch has determined that a hardware or software error has occurred.

Action Taken When the DTC Sets

Power mirror functions are suspended as long as the fault is present.

Conditions for Clearing the DTC

  1. A current DTC will clear when the fault is no longer present.
  2. A history DTC will clear after 40 fault free ignition cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

If the DTC is set, replace the appropriate outside rearview mirror switch or the passenger window switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for outside rearview mirror switch or passenger window switch replacement, setup, and programming

Symptoms - Mirrors

Note. The following steps must be completed before using the symptom tables.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following system descriptions: «Automatic Day-Night Mirror Description and Operation»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) «OnStar Description and Operation»(/buick/lacrosse/ii-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation) «Outside Mirror Description and Operation (without A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) , «Outside Mirror Description and Operation (w/A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Automatic Day-Night Mirrors Malfunction»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  2. «Heated Mirrors Malfunction»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  3. «OnStar Button LED Malfunction»(/buick/lacrosse/ii-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  4. «OnStar Button Malfunction»(/buick/lacrosse/ii-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  5. «Power Mirror Malfunction (with A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) , «Power Mirror Malfunction (without A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Heated Mirror Element Control112
Ground1
1. Heated Mirror Inoperative 2. Heated Mirror Always On

The rear defogger relay supplies voltage to the outside rearview mirror heater elements based on the current state of the rear window defogger. The relay supplies B+ through the driver/passenger mirror heating element control circuit when a request is received.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running, press the rear window defogger switch.
  2. Verify the rear window defogger turns ON and the rear window becomes warm. If the rear window defogger does not turn on Refer to «Rear Window Defogger Malfunction»(/buick/lacrosse/ii-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows) . If the rear window defogger does turn on
  3. Verify both the left and right outside mirror glass become warm. If both the left and right outside mirror glass do not become warm Refer to Circuit/System Testing below. If both the left and right outside mirror glass become warm
  4. All OK.

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate A9 Outside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 4 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Connect a test lamp between the control circuit terminal 6 and ground.
  4. Engine running.
  5. Verify the test lamp turns ON and OFF when operating the rear window defogger switch ON and OFF. If the lamp is always ON Ignition OFF, disconnect the harness connector at X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, refer to «Rear Window Defogger Malfunction»(/buick/lacrosse/ii-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows) . If the lamp is always OFF Ignition OFF, disconnect the harness connector at X50A Fuse Block - Underhood, ignition ON. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms refer to «Rear Window Defogger Malfunction»(/buick/lacrosse/ii-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows) . If the lamp turns on and off
  6. Test or replace the E17 Outside Rearview Mirror glass.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition11
Automatic Day/Night Mirror Signal222
Backup Lamp Control1, 21, 21, 2
Automatic Day/Night Mirror Low Reference22
Ground1
1. Inside Electrochromic Mirror Malfunction 2. Outside Rearview Mirror Automatic Dimming Malfunction

The inside rearview mirror uses 2 photocell sensors. One sensor is the rear light sensor, located on the face side of the mirror, facing the rear of the vehicle. The rear light sensor is used to determine light conditions present at the mirror face. The other sensor is the front light sensor, located on the backside of the mirror, facing the front of the vehicle. The front light sensor is used to determine the exterior light conditions at the front of the vehicle. With a low exterior light condition detected by the front light sensor and a high light condition from the rear light sensor, the inside rearview mirror will automatically darken the face of the inside rearview mirror and the driver outside rearview mirror. The inside rearview mirror provides a signal circuit and a low reference circuit to the driver mirror face to darken the mirror when needed.

With the gear selector lever in the REVERSE position and the engine running, backup lamp control voltage is supplied as an input to the inside rearview mirror. The mirror monitors this input to disable the automatic day-night feature. This allows the driver to see objects in the mirror clearly when backing up, regardless of the rear light sensor status.

Schematic Reference

  1. «Inside Rearview Mirror Schematics»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  2. «Outside Rearview Mirror Schematics»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, headlamps ON, transmission not in R, cover the front light sensor with a towel or other suitable item.
  2. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face.
  3. Verify the inside rearview mirror face dims. If the inside rearview mirror does not dim Refer to Circuit/System Testing - Inside Rearview Mirror Dimming Malfunction below. If the inside rearview mirror dims
  4. Engine running, park brake applied, place the transmission in R.
  5. Verify the inside rearview mirror face transitions from dim to bright. If the mirror does not transition between bright and dim states Refer to Circuit/System Testing - Inside Rearview Mirror Dimming Malfunction below. If the mirror transitions between bright and dim states
  6. Transmission not in R, shine a flashlight at the rear light sensor while observing the driver outside rearview mirror face.
  7. Verify the outside rearview mirror face dims. If the outside rearview mirror does not dim Refer to Circuit/System Testing - Outside Rearview Mirror Dimming Malfunction below. If the outside rearview mirror dims
  8. Engine running, park brake applied, place the transmission in R.
  9. Verify the driver outside rearview mirror face transitions from dim to bright. If the mirror does not transition between bright and dim states Refer to Circuit/System Testing - Outside Rearview Mirror Dimming Malfunction below. If the mirror transitions between bright and dim states
  10. All OK.

Inside Rearview Mirror Dimming Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the A10 Inside Rearview Mirror. If the test lamp illuminates
  4. Connect a test lamp between the control circuit terminal 1 and ground, engine running, park brake applied.
  5. Verify that a test lamp turns ON and OFF when shifting the transmission in and out of R. If the test lamp is always off Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Ignition ON. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always on Ignition OFF, disconnect X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  6. Replace the A10 Inside Rearview Mirror.

Outside Rearview Mirror Dimming Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A9A Driver Outside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal 14 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the A10 Inside Rearview Mirror. If less than 10 ohms
  3. Ignition ON.
  4. Test for less than 1 V between the control circuit terminal 13 and ground. If 1 V or greater Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V replace the A10 Inside Rearview Mirror. If less than 1 V
  5. Ignition ON, headlamps ON, transmission not in R, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor.
  6. Test for greater than 1 V between the control circuit terminal 13 and ground. If 1 V or less Ignition OFF, disconnect the harness connector at the A10 Inside Rearview Mirror. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the A10 Inside Rearview Mirror. If greater than 1 V
  7. Test or replace E17 Outside Rearview Mirror Glass.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Inside Rearview Mirror Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  2. «Outside Rearview Mirror Glass Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  3. «Control Module References»(/buick/lacrosse/ii-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+11
Left/Right Mirror Horizontal Motor Control11
Left/Right Mirror Vertical Motor Control11
Left/Right Mirror Motor Common Control11
Ground1
1. Power Mirror Malfunction

The outside rearview mirror switch controls the outside rearview mirrors based on the position of the mirror selector switch and which movement position is selected. The outside rearview mirror switch has four positions: up, down, left, and right. B+ is applied to the switch from the power mirror fuse and when a movement position switch is selected, voltage is sent to the commanded mirror via a mirror control circuit. The opposite mirror control circuit acts as a ground circuit for the bi-directional mirror motor. Ground is the applied through the switch.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that both outside rearview mirrors operate while commanding the outside rearview mirrors UP/DOWN and LEFT/RIGHT with the outside mirror directional switch. If the outside rearview mirrors do not move up/down or left/right Refer to Circuit/System Testing below. If the outside rearview mirrors move up/down and left/right
  2. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between each of the control circuit terminals listed below and ground: Terminal 1 control circuit Terminal 2 control circuit Terminal 3 control circuit Terminal 7 control circuit Terminal 8 control circuit Terminal 9 control circuit If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S52 Outside Rearview Mirror Switch. If the test lamp illuminates
  4. Ignition OFF, connect the harness connector at the S52 Outside Rearview Mirror Switch and disconnect the harness connector at the appropriate A9 Outside Rearview Mirror.
  5. Connect a test lamp between the control circuit terminal 8 and the control circuit terminal 2.
  6. Verify the test lamp illuminates when commanding the UP/DOWN states with the S52 Outside Rearview Mirror Switch. If the test lamp does not illuminate during either of the commands Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for less than 1 V on each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace at the S52 Outside Rearview Mirror Switch. If the test lamp illuminates during each of the commands
  7. Connect a test lamp between the control circuit terminal 8 and the control circuit terminal 7.
  8. Verify the test lamp illuminates when commanding the LEFT/RIGHT states with the S52 Outside Rearview Mirror Switch. If the test lamp does not illuminate during either of the commands Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. Test for less than 1 V on each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace at the S52 Outside Rearview Mirror Switch. If the test lamp illuminates during each of the commands
  9. Test or replace the M77 Outside Rearview Mirror Motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Outside Rearview Mirror Motor Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  2. «Outside Remote Control Rearview Mirror Switch Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Position Sensor 5 V Reference111
Left/Right Mirror Horizontal Position Sensor Signal111
Left/Right Mirror Vertical Position Sensor Signal111
Left/Right Mirror Motor Horizontal Control111
Left/Right Mirror Motor Common Control111
Left/Right Mirror Motor Vertical Control111
Low Reference1
1. Power Mirror Malfunction

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Select Switch parameter changes between Left, Right, and None when cycling the S52 Outside Rearview Mirror Switch between the left, right, and none positions. If the parameter does not cycle between the specified values Test or replace S52 Outside Rearview Mirror Switch. If the parameter does cycle between the specified values
  3. Verify the scan tool Mirror Direction Command parameter changes between Up/Down and Right/Left while cycling the S52 Outside Rearview Mirror Switch Up/Down and Right/Left. If the parameter does not cycle between the specified values Test or replace S52 Outside Rearview Mirror Switch. If the parameter does cycle between the specified values
  4. Verify the scan tool Mirror Vertical and Horizontal Position parameters are between 0.2-4.8 V. If the parameters are not between 0.2-4.8 V Refer to Circuit/System Testing - Mirror Position Sensor Circuit Test below. If the parameters are between 0.2-4.8 V
  5. Verify the mirrors move in the commanded direction when commanding the UP/DOWN and RIGHT/LEFT states with a scan tool. If a mirror does not move in all the commanded directions Refer to Circuit/System Testing - Mirror Motor Circuit Test below. If both mirrors move in all commanded directions
  6. Verify the outside rearview mirrors adjust to the stored memory positions when operating the memory 1 and 2 recall switches. If a mirror does not adjust to the stored memory position Refer to «Memory Seat Feature Malfunction»(/buick/lacrosse/ii-2009-2013/remont/seats/#power-seat-system) If both mirrors adjust to the stored memory positions
  7. All OK.

Mirror Motor Circuit Test

  1. Ignition OFF, disconnect the harness connector at the appropriate A9 Outside Rearview Mirror, ignition ON.
  2. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 8.
  3. Verify the test lamp illuminates when commanding the UP/DOWN states with the scan tool. If the test lamp remains off during either of the commands Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for less than 1 V between each of control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate switch. If the test lamp illuminates during each of the commands
  4. Connect a test lamp between the control circuit terminal 7 and the control circuit terminal 8.
  5. Verify the test lamp illuminates when commanding the LEFT/RIGHT states with the scan tool. If the test lamp does not illuminate during either of the commands Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in each control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate switch. If the test lamp illuminates during each of the commands
  6. Test or replace the Outside Rearview Mirror Motor.

Mirror Position Sensor Circuit Test

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate A9 Outside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal 18 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate switch. If less than 10 ohms
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate switch. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the appropriate switch. If between 4.8 - 5.2 V
  5. Install a 3 A fused jumper wire at the signal circuit terminal 1.
  6. Verify the scan tool Mirror Vertical Position parameter changes between less than 0.2 V and greater than 4.8 V when moving the jumper wire between the low reference circuit terminal 18 and the 5 V reference circuit terminal 3. If the Mirror Vertical Position parameter does not change Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). If the Mirror Vertical Position parameter changes
  7. Install a 3 A fused jumper wire at the signal circuit terminal 5.
  8. Verify the scan tool Mirror Horizontal Position parameter changes between less than 0.2 V and greater than 4.8 V when moving the jumper wire between the low reference circuit terminal 18 and the 5 V reference circuit terminal 3. If the Mirror Horizontal Position parameter does not change Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror), ignition ON. Test for less than 1 V between the signal circuit terminal 5 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S52 Outside Rearview Mirror Switch (driver mirror) or S79P Window Switch - Passenger (passenger mirror). If the Mirror Horizontal Position parameter changes
  9. Test or replace the Outside Rearview Mirror Motor

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Outside Rearview Mirror Motor Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  2. «Outside Remote Control Rearview Mirror Switch Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/lacrosse/ii-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.

Diagnostic Aids

Not all vehicles have the Park Tilt Mirror feature, verify that the Park Tilt Mirrors option is available in the DIC Vehicle Customization Feature Setting Menu before attempting diagnosis.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the park assist option is activated in the driver information center (DIC).
  3. Select the driver outside mirror on S52 Outside Rearview Mirror Switch.
  4. Verify mirror functions properly when operating the S52 Outside Rearview Mirror Switch in UP/DOWN and LEFT/RIGHT positions. If the mirror does not function properly Refer to «Power Mirror Malfunction (with A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) , «Power Mirror Malfunction (without A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) . If the mirror functions properly
  5. Select the passenger outside mirror on S52 Outside Rearview Mirror Switch.
  6. Verify mirror functions properly when operating the S52 Outside Rearview Mirror Switch in UP/DOWN and LEFT/RIGHT positions.. If the mirror does not function properly Refer to «Power Mirror Malfunction (with A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) , «Power Mirror Malfunction (without A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) . If the mirror functions properly
  7. Operate the memory 1 and 2 recall switches on S47D Seat Memory Switch - Driver.
  8. Verify the outside rearview mirrors adjust to the stored memory positions. If the mirrors do not adjust to the stored positions Refer to «Power Mirror Malfunction (with A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) , «Power Mirror Malfunction (without A45)»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) . If the mirrors adjust to the stored positions
  9. Park brake on, vehicle running, shift the vehicle in REVERSE.
  10. Verify that the outside rearview mirrors tilt. If the driver outside mirror does not tilt Ignition OFF. Replace the S52 Outside Rearview Mirror Switch. Park brake on, vehicle running, shift the vehicle in REVERSE. Verify the driver mirror tilts. If the mirror does not tilt, replace the K40 Memory Seat Module. If the mirror tilts All OK. If the passenger outside mirror does not tilt Ignition OFF. Replace the S79P Passenger Window Switch. Park brake on, vehicle running, shift the vehicle in REVERSE. Verify the driver mirror tilts. If the mirror does not tilt, replace the K40 Memory Seat Control Module. If the mirror tilts All OK. If the mirrors tilt
  11. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Front Side Door Window and Multifunction Switch Replacement»(/buick/lacrosse/ii-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows)
  2. «Front Side Door Window Switch Replacement»(/buick/lacrosse/ii-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows)
  3. «Driver or Passenger Seat Adjuster Memory Module Replacement»(/buick/lacrosse/ii-2009-2013/remont/seats/#power-seat-system)

Scheme 6

Scheme 6: Outside Rearview Mirror Replacement
Scheme 6: Outside Rearview Mirror Replacement
CalloutComponent Name
Preliminary Procedure Remove the front side door garnish molding. Refer to Front Side Door Garnish Molding Replacement .
1Outside Rearview Mirror Fastener (Qty: 3) CAUTION: Refer to Fastener Caution . Procedure Disconnect the electrical connector. Tighten 10 N.m (89 lb in)
2Outside Rearview Mirror Procedure Inspect the mirror for proper operation.
CAUTION
Refer to Fastener Caution .

Outside Rearview Mirror Replacement

Scheme 7

Scheme 7: Outside Remote Control Rearview Mirror Switch Replacement
Scheme 7: Outside Remote Control Rearview Mirror Switch Replacement
CalloutComponent Name
Preliminary Procedure Remove the front side door trim panel. Refer to Front Side Door Trim Panel Replacement .
1Outside Remote Control Rearview Mirror Switch Retainer (Qty: 3) TIP: Use a small flat-bladed tool to release the outside remote control rearview mirror switch.
2Outside Remote Control Rearview Mirror Switch

Outside Remote Control Rearview Mirror Switch Replacement

Removal Procedure

  1. Remove the mirror face (1). Refer to «Outside Rearview Mirror Glass Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) .
  2. Remove the screws from the mirror motor (2).
  3. Disconnect the electrical connector from the edge of the mirror motor. Note the position of the plugs on the mirror motor when removing.
  4. Remove the motor.

Installation Procedure

  1. Position the motor to the mirror housing.
  2. Connect the electrical connector to the edge of the mirror motor.
  3. Install the screw to the mirror motor (2) and tighten to 2 N.m (18 lb in).
  4. Install the mirror face to the mirror housing. Refer to «Outside Rearview Mirror Glass Replacement»(/buick/lacrosse/ii-2009-2013/remont/mirrors/#mirror-system) .
  5. Inspect the mirror for proper operation.
  1. Carefully push the mirror face toward the front of the car and downward on the inner edge, near the front door window glass, to allow access.
  2. Grasp the mirror face back and firmly pull it away from the mirror motor and housing. It will be necessary to use a sharp jerking motion to release it from the housing.
  3. Lift the mirror back up and out to release the lower tabs.
  4. Disconnect the heated mirror wires, if equipped.
  1. Connect the heated mirror wires, if equipped.
  2. Using the palm of your gloved hand, press firmly on the center of the glass until the case seats onto the motor. The mirror will make a snapping noise when properly seated.
  3. Inspect the mirror for proper operation.

Scheme 8

Scheme 8: Inside Rearview Mirror Replacement
Scheme 8: Inside Rearview Mirror Replacement
CalloutComponent Name
1Inside Rearview Mirror Fastener CAUTION: Refer to Fastener Caution . Procedure Remove the inside rearview mirror cover, if equipped Disconnect the electrical connector, if equipped. Adjust the mirror to the full upward position. Loosen the set screw located at the base of the mirror. Slide the mirror upward off of the rearview mirror button. Refer to Control Module References for programming and setup information. Tighten 2 N.m (18 lb in)
CAUTION
Refer to Fastener Caution .

Inside Rearview Mirror Replacement

Scheme 9

Scheme 9: Inside Rearview Mirror Bracket Installation
Scheme 9: Inside Rearview Mirror Bracket Installation
  1. Determine the location of the mirror mounting base by marking the outside of the windshield with a marking pencil where the base was previously located. If it is not clear where the base was mounted, use the following steps to determine where the base should be installed: Using a measuring tape, measure the distance between the windshield pillars from the base of the shade line. Using a marking pencil, halfway between the windshield pillars, draw a centerline (1) on the windshield from the roof panel to the windshield base. Draw a perpendicular line intersecting the centerline (2) at that location. The top center of the mirror mounting base will be at the intersection of these lines.
  2. Scrape the inside windshield glass thoroughly with a safety razor or utility knife in order to remove all old adhesive.
  3. If reinstalling the original mounting base, place the mirror mounting base in a suitable holding device, such as a vice.
  4. Scrape the mirror mounting base thoroughly with a safety razor or utility knife in order to remove all old adhesive.
  5. Clean the inside windshield glass and the mounting surface of the mirror mounting base thoroughly with a clean cloth saturated with naphtha or a 50/50 mixture (by volume) of clean water and isopropyl alcohol.
  6. Using the Inside Mirror Adhesive Kit, or equivalent to apply a small amount of activator to the mounting surface of the mirror mounting base.
  7. Apply a small amount of activator to the windshield where the mounting base is to be installed.
  8. Allow the activator to dry 5 minutes.
  9. Apply 1 drop of adhesive to the center of the mirror mounting base.
  10. Immediately apply the mounting base to the windshield, ensuring that the mounting base aligns correctly to the marks made on the outside of the windshield.
  11. Hold the mounting base firmly in place for 1 minute.
  12. Allow the adhesive to set for 15 minutes.
  13. Install the mirror to the mirror mounting base and fasten, if necessary.
  14. Connect the electrical connector and install the wire cover, if equipped.

Inside Rearview Mirror with the Automatic Day-Night Feature System Operation

The inside rearview mirror uses 2 photocell sensors. One sensor is the headlight sensor, located on the face side of the mirror. The headlight sensor is used to determine light conditions present at the mirror face. The other sensor is the ambient light sensor, located on the rear of the mirror or windshield side. The ambient light sensor is used to determine the exterior light conditions. With a low exterior light condition detected, and a high light condition from behind the car, at the headlight sensor, the inside rearview mirror will automatically darken the face of the mirror.

In the daytime, the mirror is in a normal state because of the high exterior light condition that is indicated by the ambient light sensor. With the gear selector lever in the REVERSE position and the engine running, backup lamp supply voltage is supplied as an input to the inside rearview mirror. The mirror monitors this input to disable the automatic day-night feature. This allows the driver to see objects in the mirror clearly when backing up, even during the night.

Driver Outside Rearview Mirror with Automatic Day-Night System Operation (If Equipped)

The automatic day-night feature of the driver outside rearview mirror is controlled by the inside rearview mirror. The inside rearview mirror supplies control and low reference to the driver outside rearview mirror. At night, with the automatic day-night feature enabled, the driver outside rearview mirror will automatically darken with the inside rearview mirror to reduce glare from headlamps behind the vehicle.

The power mirror system consists of the following components

  1. Memory Seat Module
  2. Outside Mirror Switch
  3. Passenger Window Switch
  4. Left Outside Rearview Mirror
  5. Right Outside Rearview Mirror

The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rear view mirrors through bi-directional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.

Heated Mirrors

The heated mirrors are controlled through the rear defog relay. Whenever the rear window defogger is turned on battery voltage is supplied to the mirror heater elements through the left and right mirror heater element control circuits.

The power mirror system consists of the following components

  1. Mirror direction switch - Controls the left, right, up and down movements of the mirrors
  2. Mirror select switch - Allows the operator to select the mirror to be moved
  3. Left outside mirror - Contains both the horizontal and vertical mirror motors
  4. Right outside mirror - Contains both the horizontal and vertical mirror motors

Each of the outside power mirrors contains 2 motors. The up-down motor operates the vertical directions and the left-right motor operates the horizontal directions. Each of the power mirror motors are internally circuit breaker protected.

The outside mirror switch incorporates a mirror select switch and a 4 position mirror direction switch.

The mirror select switch allows the driver to select the mirror to be moved by turning the switch to L position enabling the left outside mirror or turning the switch to R position enabling the right outside mirror.

The mirror direction switch is a 4 position switch that allows the operator to move the selected mirror up, down, left or right.

The outside mirror switch receives power through the battery positive voltage circuit from the underhood fuse block. The outside mirror switch also receives a constant ground.

The 4 positions of the direction switch have multiple switch contacts. When not in use, the directional contacts are isolated from any circuit. Each of the contacts are connected to opposing sides of the appropriate mirror motors through the selector switch. The selector switch interrupts or completes these circuits depending on the position of the selector switch, L or R.

If the mirror select switch is placed in the L position and the up switch is pressed, battery voltage will be supplied to the driver outside mirror vertical motor through the driver mirror motor up control circuit and return to the mirror switch through the driver mirror motor left/down control circuit, then to ground and the mirror will move up. If the down switch is pressed, the driver mirror motor left/down control circuit supplies battery voltage and the driver mirror motor up control circuit completes the path to the mirror switch, then to ground and the mirror will move down.

The remainder of the mirror functions operate in the same manner as described above. Placing the mirror control switch in opposing positions, left/right or up/down, will reverse the voltage polarity to the mirror motor, utilizing the same circuits and the mirror will move accordingly.

The heated mirrors are controlled through the rear defog relay. Whenever the rear window defogger is turned ON, battery voltage is supplied to the mirror heater elements through the left and right mirror heater element control circuits.