Mirror System: Other Buick LaCrosse II facelift

Reference Information

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Outside Mirror Description and Operation (With A45) , Outside Mirror Description and Operation (Without A45)

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify the A9A Outside Rearview Mirror-Driver moves when commanding the Driver Mirror Horizontal Movement Right/Left and Driver Mirror Vertical Movement Up/Down with a scan tool. If the A9A Outside Rearview Mirror-Driver does not move RIGHT or LEFT or UP or DOWN Replace the M77D Outside Rearview Mirror Motor-Driver. If the A9A Outside Rearview Mirror-Driver moves RIGHT, LEFT, UP and DOWN
3. Verify the A9B Outside Rearview Mirror-Passenger moves when commanding the Passenger Mirror Horizontal Movement Right/Left and Passenger Mirror Vertical Movement Up/Down with a scan tool. If the A9B Outside Rearview Mirror-Passenger does not move RIGHT or LEFT or UP or DOWN Replace the M77P Outside Rearview Mirror Motor-Passenger. If the A9B Outside Rearview Mirror-Passenger moves RIGHT, LEFT, UP and DOWN
4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Outside Rearview Mirror Motor Replacement .

Symptoms - Mirrors

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

1. Perform the «Diagnostic System Check - Vehicle»(ref-621960-S18230123002014061000000) 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»(ref-622011-S06822705802014061000000) «OnStar Description and Operation»(ref-621974-S34702468882014061000000) «Outside Mirror Description and Operation (With A45)»(ref-622011-S04080159212014061000000) , «Outside Mirror Description and Operation (Without A45)»(ref-622011-S00870155682014061000000)

Intermittent

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

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Outside Mirror Description and Operation (With A45) , Outside Mirror Description and Operation (Without A45)

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

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»(ref-622009-S02033008112014061000000) . 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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Outside Rearview Mirror Glass Replacement

Schematic Reference

1. «Inside Rearview Mirror Schematics»(ref-622011-S39644366402014061000000)
2. «Outside Rearview Mirror Schematics»(ref-622011-S20930564232014061000000)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Automatic Day-Night Mirror Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Cover the windshield with a blanket or other suitable item.
3. Verify the A10 Inside Rearview Mirror face dims when shining a bright light into the rear light sensor If the A10 Inside Rearview Mirror does not dim Refer to «Circuit/System Testing - Inside Review Mirror Dimming Inoperative»(ref-622011-S17799855862014061000000) If the A10 Inside Rearview Mirror dims
4. Verify the A10 Inside Rearview Mirror face transitions from dim to bright while commanding the Backup Lamps Active and Inactive with a scan tool. If the A10 Inside Rearview Mirror does not transition between dim and bright. Refer to «Circuit/System Testing - Day-Night Disable Malfunction»(ref-622011-S17799855862014061000000) If the A10 Inside Rearview Mirror transitions between bright and dim states
5. Verify the A9A Outside Rearview Mirror-Driver face dims when shining a bright light into the rear light sensor. If the A9A Outside Rearview Mirror-Driver does not dim Refer to «Outside Rearview Mirror Dimming Malfunction»(ref-622011-S17799855862014061000000) . If the A9A Outside Rearview Mirror-Driver dims
6. Verify the A9A Outside Rearview Mirror-Driver face transitions from dim to bright while commanding the Backup Lamps Active and Inactive with a scan tool. If the A9A Outside Rearview Mirror-Driver does not transition between bright and dim states Refer to «Outside Rearview Mirror Dimming Malfunction»(ref-622011-S17799855862014061000000) . If the A9A Outside Rearview Mirror-Driver transitions between bright and dim states
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Inside Rearview Mirror Replacement»(ref-622011-S06437469882014061000000)
2. «Outside Rearview Mirror Glass Replacement»(ref-622011-S26893651032014061000000)

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Outside Mirror Description and Operation (With A45) , Outside Mirror Description and Operation (Without A45)

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

1. Verify the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger move UP, DOWN, LEFT and RIGHT with the S52 Outside Rearview Mirror Switch. If both outside mirror glasses do not move Refer to «Circuit/System Testing - Both Outside Rearview Mirrors Inoperative»(ref-622011-S22122468552014061000000) . If the driver outside mirror glass does not move UP, DOWN, LEFT or RIGHT Refer to «Circuit/System Testing - Driver Outside Mirror Movement Malfunction»(ref-622011-S22122468552014061000000) . If the passenger outside mirror glass does not move UP, DOWN, LEFT or RIGHT Refer to «Circuit/System Testing - Passenger Outside Mirror Movement Malfunction»(ref-622011-S22122468552014061000000) . If the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger move UP, DOWN, LEFT and RIGHT
2. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Outside Rearview Mirror Motor Replacement»(ref-622011-S18225430992014061000000)
2. «Outside Rearview Mirror Remote Control Switch Replacement»(ref-622011-S24930440882014061000000)

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Outside Mirror Description and Operation (With A45) , Outside Mirror Description and Operation (Without A45)

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Mirror 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 Replace the 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, Right and Left while cycling the S52 Outside Rearview Mirror Switch UP, DOWN, RIGHT and LEFT. If the parameter does not cycle between the specified values Replace the S52 Outside Rearview Mirror Switch. If the parameter does cycle between the specified values
4. Verify the A9A Outside Rearview Mirror-Driver moves when commanding the Driver Mirror Horizontal Movement Right/Left and Driver Mirror Vertical Movement Up/Down with a scan tool. If the A9A Outside Rearview Mirror-Driver does not move RIGHT or LEFT or UP or DOWN Refer to «Circuit/System Testing - Driver Outside Mirror Movement Malfunction»(ref-622011-S05533330142014061000000) . If the A9A Outside Rearview Mirror-Driver moves RIGHT, LEFT, UP and DOWN
5. Verify the scan tool Driver Mirror Vertical Position parameters are between 0.2-4.8 V and change when commanding the Driver Mirror Vertical Movement Up/Down with a scan tool. If not between 0.2-4.8 V or does not change Refer to «Circuit/System Testing - Driver Mirror Position Sensor Circuit Test»(ref-622011-S05533330142014061000000) . If between 0.2-4.8 V and changes
6. Verify the scan tool Driver Mirror Horizontal Position parameters are between 0.2-4.8 V and change when commanding the Driver Mirror Horizontal Movement Right/Left with a scan tool. If not between 0.2-4.8 V or does not change Refer to «Circuit/System Testing - Driver Mirror Position Sensor Circuit Test»(ref-622011-S05533330142014061000000) . If between 0.2-4.8 V and changes
7. Verify the A9B Outside Rearview Mirror-Passenger moves when commanding the Passenger Mirror Horizontal Movement Right/Left and Passenger Mirror Vertical Movement Up/Down with a scan tool. If the A9B Outside Rearview Mirror-Passenger does not move RIGHT or LEFT or UP or DOWN Refer to «Circuit/System Testing - Passenger Outside Mirror Movement Malfunction»(ref-622011-S05533330142014061000000) . If the A9B Outside Rearview Mirror-Passenger moves RIGHT, LEFT, UP and DOWN
8. Verify the scan tool Passenger Mirror Vertical Position parameters are between 0.2-4.8 V and change while commanding the Passenger Mirror Horizontal Movement Right/Left with a scan tool. If not between 0.2-4.8 V or does not change Refer to «Circuit/System Testing - Passenger Mirror Position Sensor Circuit Test»(ref-622011-S05533330142014061000000) . If between 0.2-4.8 V and changes
9. Verify the scan tool Passenger Mirror Horizontal Position parameters are between 0.2-4.8 V and change while commanding the Passenger Mirror Vertical Movement Up/Down with a scan tool. If not between 0.2-4.8 V or does not change Refer to «Circuit/System Testing - Passenger Mirror Position Sensor Circuit Test»(ref-622011-S05533330142014061000000) . If between 0.2-4.8 V and changes
10. Verify the A9A Outside Rearview Mirror-Driver and A9B Outside Rearview Mirror-Passenger adjust to the stored memory positions when operating the S47D Driver Seat Memory Switch. If a A9 Outside Rearview Mirror does not adjust to the stored memory position Refer to «Memory Seat Feature Malfunction»(ref-622023-S38473493602014061000000) . If the A9A Outside Rearview Mirror-Driver and A9B Outside Rearview Mirror-Passenger adjust to the stored memory positions
11. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Outside Rearview Mirror Motor Replacement»(ref-622011-S18225430992014061000000)
2. «Outside Rearview Mirror Remote Control Switch Replacement»(ref-622011-S24930440882014061000000)
3. «Front Side Door Window Switch Replacement»(ref-622009-S30203751762014061000000)

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Outside Mirror Description and Operation (With A45) , Outside Mirror Description and Operation (Without A45)

Electrical Information Reference

1. «Circuit Testing»(ref-621979-S25489769122014061000000)
2. «Connector Repairs»(ref-621979-S38632404432014061000000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-621979-S12070404672014061000000)
4. «Wiring Repairs»(ref-621979-S02064091202014061000000)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the A9A Outside Rearview Mirror-Driver moves when commanding the Driver Mirror Horizontal Movement Right/Left and Driver Mirror Vertical Movement Up/Down with a scan tool. If the A9A Outside Rearview Mirror-Driver does not move RIGHT or LEFT or UP or DOWN Refer to «Power Mirror Malfunction (Without A45)»(ref-622011-S16920019382014061000000) , «Power Mirror Malfunction (With A45)»(ref-622011-S28178727962014061000000) . If the A9A Outside Rearview Mirror-Driver moves RIGHT, LEFT, UP and DOWN
3. Verify the A9B Outside Rearview Mirror-Passenger moves when commanding the Passenger Mirror Horizontal Movement Right/Left and Passenger Mirror Vertical Movement Up/Down with a scan tool. If the A9B Outside Rearview Mirror-Passenger does not move RIGHT or LEFT or UP or DOWN Refer to «Power Mirror Malfunction (Without A45)»(ref-622011-S16920019382014061000000) , «Power Mirror Malfunction (With A45)»(ref-622011-S28178727962014061000000) . If the A9B Outside Rearview Mirror-Passenger moves RIGHT, LEFT, UP and DOWN
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for the seat memory control module replacement, programming and setup

Scheme 12

Outside Rearview Mirror Replacement

Scheme 13

Outside Rearview Mirror Remote Control Switch Replacement

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.

Scheme 14

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.