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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Rendezvous - FWD 🢒 Body Systems 🢒 Mirrors 🢒 Power Mirrors Inoperative

Power Mirrors Inoperative Rendezvous w/A43

Diagnostic Aids
    • An intermittent power mirrors inoperative fault may be caused by an open outside rearview mirror switch ground circuit. When the outside rearview mirror switch ground circuit is open, the switch may seek a ground path through the illumination ground circuit.
    • An intermittent driver outside rearview mirror malfunction may be caused by an open driver mirror motor left control circuit. When the driver mirror motor left control circuit is open, the driver mirror motor may seek an alternate circuit path through the passenger mirror motor.
    • An intermittent passenger outside rearview mirror malfunction may be caused by an open passenger mirror motor left control circuit. When the passenger mirror motor left control circuit is open, the passenger mirror motor may seek an alternate circuit path through the driver mirror motor.

Test Description

  1. This step tests for an open in the outside rearview mirror switch ground circuit. If the mirror switch ground circuit is open, turning on the headlamps will remove the alternate ground path through the illumination ground circuit.

    2.

  2. This step tests to see if the malfunction is on the switch side of the memory seat module (MSM), or the mirror motor side.

    3.

  3. This step tests for a short to ground in the mirror switch or motor control circuits.

    4.

  4. This step tests for an open or short to ground in the mirror switch supply voltage circuit.

    5.

  5. This step tests for an open or short to ground in the mirror motor.

    6.

  6. This step tests for an open or short to ground in the mirror motor assembly.

Step

Action

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

Connector End View Reference: Vehicle Access Connector End Views or Power Seat Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify the power mirrors inoperative fault is present.

Does the power mirrors system operate normally?

Go to Step 3

Go to Step 4

3

  1. Turn ON the headlamp switch.
  2. Verify the power mirrors inoperative fault is present.

Does the power mirrors system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 13

4

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the left and right mirrors Up, Down, Right and Left.

Do the mirrors move Up, Down, Right and Left as commanded?

Go to Step 5

Go to Step 9

5

Are both power mirrors inoperative?

Go to Step 7

Go to Step 6

6

Is the horizontal function the inoperative mirror function?

Go to Step 14

Go to Step 15

7

  1. With a scan tool, observe the mirror switch state in the memory seat module (MSM) data list.
  2. Activate the left and right mirrors to the Up, Down, Left and Right positions

Does the scan tool display Idle?

Go to Step 8

Go to Step 16

8

  1. Turn OFF the ignition.
  2. Disconnect the outside rearview mirror switch.
  3. Probe the mirror switch supply voltage circuit of the outside rearview mirror switch with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 17

Go to Step 18

9

Is the mirror operation intermittent?

Go to Step 19

Go to Step 10

10

  1. Turn OFF the ignition.
  2. Disconnect the appropriate outside rearview mirror motor.
  3. Connect a test lamp between the appropriate mirror motor control circuits of the outside rearview mirror motor harness connector.
  4. Activate the outside rearview mirror switch in both directions for the functions being tested.

Does the test lamp illuminate in both directions?

Go to Step 22

Go to Step 11

11

  1. Connect the appropriate outside rearview mirror motor.
  2. Disconnect the appropriate outside rearview mirror assembly.
  3. Connect a test lamp between the appropriate mirror motor control circuits of the outside rearview mirror motor assembly harness connector.
  4. Activate the outside rearview mirror switch in both directions for the functions being tested.

Does the test lamp illuminate in both directions?

Go to Step 23

Go to Step 12

12

Is the mirror inoperative in a single direction?

Go to Step 20

Go to Step 21

13

Test the ground circuit of the outside rearview mirror switch for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 24

14

Test the appropriate mirror switch right signal circuit of the outside rearview mirror switch for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 24

15

Test the appropriate mirror switch down signal circuit of the outside rearview mirror switch for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 24

16

Test the appropriate mirror switch signal circuit or mirror motor right/up control circuit of the outside rearview mirror switch for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 24

17

Test the mirror motor right/up control circuit of the outside rearview mirror switch for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 24

18

Test the mirror switch supply voltage circuit of the outside rearview mirror switch for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 25

19

Test the appropriate mirror motor left control circuit of the appropriate mirror motor for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 25

20

Test the appropriate mirror motor control circuit of the appropriate mirror motor for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 25

21

Test the appropriate mirror motor control circuit of the appropriate mirror motor for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 25

22

Inspect for poor connections at the harness connector of the appropriate outside rearview mirror motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 26

23

Inspect for poor connections at the harness connector of the appropriate outside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 27

24

Inspect for poor connections at the harness connector of the outside rearview mirror switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 28

25

Inspect for poor connections at the harness connector of the MSM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 30

Go to Step 29

26

Replace the outside rearview mirror motor. Refer to Outside Rearview Mirror Motor Replacement .

Did you complete the replacement?

Go to Step 30

--

27

Replace the outside rearview mirror assembly. Refer to Power Mirror Replacement .

Did you complete the replacement?

Go to Step 30

--

28

Replace the outside rearview mirror switch. Refer to Power Mirror Switch Replacement .

Did you complete the replacement?

Go to Step 30

--

29

Replace the MSM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 30

--

30

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Power Mirrors Inoperative Rendezvous w/o A43

Diagnostic Aids
    • If the power mirror system fuse is open and a short to ground in the battery positive voltage circuit is not detected, the fault could be a short to ground in one of the power mirror control circuits. This would open the power mirror system fuse when the mirror switch is pressed.
    • If both power mirrors are inoperative on one or more axis, the most probable cause is a power mirror switch failure. However the fault could be an open circuit on two or more of the power mirror control circuits.
    • The power mirror assembly is equipped with a pigtail harness that is not serviceable. If an open or short circuit is detected in the power mirror assembly pigtail harness, replace the power mirror assembly.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the integrity of both the mirror control circuits to the power mirror motor and the power mirror switch. If both power mirror motors are inoperative on one or more axis, begin testing by disconnecting one of the power mirror motors, if an open circuit is detected and repaired for that power mirror motor, repeat step 5 for the other power mirror motor.

    2.

  2. This step tests the integrity of both the mirror control circuits to the power mirror assembly and the power mirror switch. If both power mirror assemblies are inoperative on one or more axis, begin testing by disconnecting one of the power mirror assemblies, if an open circuit is detected and repaired for that power mirror assembly, repeat step 7 for the other power mirror assembly.

    3.

  3. This step tests the integrity of the battery positive voltage circuit not the fuse.

Step

Action

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

Connector End View Reference: Mirror Connector End Views and Vehicle Access Connector End Views .

1

Did you review the Outside Mirror Description and Operation?

Go to Step 2

Go to Symptoms - Vehicle Access

2
  1. Place the mirror selector switch in the LEFT mirror position.
  2. Activate the mirror position switch in the UP, DOWN, LEFT and RIGHT directions and note the operation.
  3. Place the mirror selector switch in the RIGHT mirror position.
  4. Activate the mirror position switch in the UP, DOWN, LEFT and RIGHT directions and note the operation.

Do both power mirrors operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Are both the left and right power mirrors completely inoperative?

Go to Step 4

Go to Step 5

4
  1. Disconnect the power mirror switch.
  2. Probe the battery positive voltage circuit of the power mirror switch harness connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

5

  1. Disconnect the appropriate power mirror motor.
  2. Connect a test lamp between the appropriate mirror motor control circuits of the power mirror motor harness connector.
  3. Place the mirror selector switch to the mirror to be tested.
  4. Activate the power mirror switch in both directions for the functions being tested.

Does the test lamp illuminate in both directions?

Go to Step 12

Go to Step 7

6

Connect a test lamp between the battery positive voltage circuit of the power mirror switch harness connector and the ground circuit of the power mirror switch harness connector.

Does the test lamp illuminate?

Go to Step 10

Go to Step 17

7

  1. Connect the appropriate power mirror motor.
  2. Disconnect the appropriate power mirror assembly.
  3. Connect a test lamp between the appropriate mirror motor control circuits of the power mirror assembly harness connector.
  4. Place the mirror selector switch to the mirror to be tested.
  5. Activate the power mirror switch in both directions for the functions being tested.

Does the test lamp illuminate in both directions?

Go to Step 13

Go to Step 9

8

Test the battery positive voltage circuit of the power mirror switch for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 10

9

Test the mirror motor control circuits for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 10

10
  1. If the power mirror was previously disconnected, connect the power mirror.
  2. If the power mirror switch was not previously disconnected, disconnect the power mirror switch.
  3. Probe each of the power mirror motor control circuits of the power mirror switch harness connector with a test lamp that is connected to battery positive voltage.

Did the test lamp illuminate at any of the power mirror motor control circuits?

Go to Step 15

Go to Step 11

11

Probe each of the power mirror motor control circuits of the power mirror switch harness connector with a test lamp that is connected to a good ground.

Did the test lamp illuminate at any of the power mirror motor control circuits?

Go to Step 16

Go to Step 14

12

Inspect for poor connections at the harness connector of the power mirror motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 18

13

Inspect for poor connections at the harness connector of the power mirror assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 19

14

Inspect for poor connections at the harness connector of the power mirror switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 20

15

Repair the short to ground in the power mirror motor control circuit(s). Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 21

--

16

Repair the short to voltage in the power mirror motor control circuit(s). Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 21

--

17

Repair the open in the power mirror switch ground circuit. Refer Wiring Repairs .

Did you complete the repair?

Go to Step 21

--

18

Replace the power mirror motor. Refer to Outside Rearview Mirror Motor Replacement .

Did you complete the replacement?

Go to Step 21

--

19

Replace the power mirror assembly. Refer to Power Mirror Replacement .

Did you complete the replacement?

Go to Step 21

--

20

Replace the power mirror switch. Refer to Power Mirror Switch Replacement .

Did you complete the replacement?

Go to Step 21

--

21

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2