Buick Regal: Power Mirror Malfunction (without A45)
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category
Diagnostic Fault Information
1. Both Outside Power Mirrors Inoperative
2. Driver Outside Power Mirror Malfunction
3. Passenger Outside Power Mirror Malfunction
Circuit/System Description
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.
Reference Information
Schematic Reference
Outside Rearview Mirror Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Outside Mirror Description and Operation (Without A45)
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Circuit/System Verification
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 S146 Outside
Rearview Mirror Switch.
- If both outside mirror glasses do not move
Refer to Circuit/System Testing - Both Outside Rearview Mirrors
Inoperative.
- If the driver outside mirror glass does not move UP, DOWN, LEFT or
RIGHT
Refer to Circuit/System Testing - Driver Outside Mirror Movement
Malfunction.
- If the passenger outside mirror glass does not move UP, DOWN, LEFT or
RIGHT
Refer to Circuit/System Testing - Passenger Outside Mirror Movement
Malfunction.
- Go to next step: 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.
Circuit/System Testing
Both Outside Rearview Mirrors Inoperative
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector
at the S146 Outside
Rearview Mirror Switch. It may take up to 2 minutes for all vehicle systems to
power down.
2. Test for less than 10 Ω between the ground circuit terminal 24 and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 10 Ω
3. Verify a test lamp illuminates between the B+ circuit terminal 23 and
ground.
- If the test lamp does not illuminate and the circuit fuse is good
- Ignition OFF.
- Test for less than 2 Ω in the B+ circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, 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.
- Go to next step: If infinite resistance
- Test for infinite resistance between each of the control circuit
terminals listed below and
ground:
- Control circuit terminal 2
- Control circuit terminal 3
- Control circuit terminal 4
- Control circuit terminal 6
- Control circuit terminal 7
- Control circuit terminal 8
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the appropriate M77 Outside Rearview
Mirror Motor.
- Go to next step: If the test lamp illuminates
4. Test or replace the S146 Outside Rearview Mirror Switch.
Driver Outside Mirror Movement Malfunction
1. Ignition OFF, disconnect the X510 inline harness connector at the A9A
Outside Rearview Mirror-
Driver. Ignition ON
2. Connect a test lamp between the control circuit terminal 9 and control
circuit terminal 12.
3. Verify the test lamp turns ON when commanding the UP and DOWN states with the
S146 Outside
Rearview Mirror Switch.
- If the test lamp remains OFF during either of the commands
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch.
- Test for infinite resistance between each control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in each control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the S146 Outside Rearview Mirror
Switch.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch, ignition ON.
- 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 or replace the S146 Outside Rearview Mirror
Switch
- Go to next step: If the test lamp turns ON during each of the
commands
4. Connect a test lamp between the control circuit terminal 10 and control
circuit terminal 12.
5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with
the S146
Outside Rearview Mirror Switch.
- If the test lamp remains OFF during either of the commands
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch.
- Test for infinite resistance between each control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in each control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the S146 Outside Rearview Mirror
Switch.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch, ignition ON.
- 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 or replace the S146 Outside Rearview Mirror
Switch
- Go to next step: If the test lamp turns ON during each of the
commands
6. Test or replace the M77D Outside Rearview Mirror Motor-Driver.
Passenger Outside Mirror Movement Malfunction
1. Ignition OFF, disconnect the X610 inline harness connector at the A9B
Outside Rearview Mirror-
Passenger. Ignition ON
2. Connect a test lamp between the control circuit terminal 9 and control
circuit terminal 12.
3. Verify the test lamp turns ON when commanding the UP and DOWN states with the
S146 Outside
Rearview Mirror Switch.
- If the test lamp remains OFF during either of the commands
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch.
- Test for infinite resistance between each control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in each control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the S146 Outside Rearview Mirror
Switch.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch, ignition ON.
- 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 or replace the S146 Outside Rearview Mirror
Switch
- Go to next step: If the test lamp turns ON during each of the
commands
4. Connect a test lamp between the control circuit terminal 10 and control
circuit terminal 12.
5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with
the S146
Outside Rearview Mirror Switch.
- If the test lamp remains OFF during either of the commands
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch.
- Test for infinite resistance between each control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in each control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the S146 Outside Rearview Mirror
Switch.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the S146 Outside
Rearview Mirror Switch, ignition ON.
- 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 or replace the S146 Outside Rearview Mirror
Switch
- Go to next step: If the test lamp turns ON during each of the
commands
6. Test or replace the M77P Outside Rearview Mirror Motor-Passenger.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Outside Rearview Mirror Actuator Replacement
- Front Side Door Window Switch Replacement
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Outside Rearview Mirror Replacement
Preliminary Procedures
Front Side Door Window Garnish Molding Replacement.
Outside Rearview Mirror Bolt [3x]
CAUTION:
Fastener Caution.
Tighten
9 N.m (80 lb
AUTOMATIC DAY-NIGHT MIRROR DESCRIPTION AND OPERATION
Inside Rearview Mirror with the Automatic Day-Night Feature System
Operation
The inside rearview mirror uses 2 photocell sensors. One sensor is th
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
Keys can be programmed in various ways using the procedures outlined below.
Using the Replacing
Keys procedures will first erase all the known keys from the vehicle. Any
existing keys and any new
keys will then be programmed. This procedure should be used any time a key is
required to be unlearne