For 1990-2009 cars

## Power Mirrors Inoperative w/DNP

### 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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Position Sensor 5-Volt Reference | B1580, B1590 | B1580, B1590 | B1580, B1590 | --
Driver/Passenger Mirror Horizontal Position Sensor Signal | B1580 | 1 | B1580 | --
Driver/Passenger Mirror Vertical Position Sensor Signal | B1590 | 1 | B1590 | --
Left/Right Mirror Motor Horizontal Control | B1544 04, B1605 02 | B1544 04, B1605 04 | B1605 01 | --
Left/Right Mirror Motor Common Control | B1544 04, B1600 04, B1605 04, B1544 02 | B1544 04, B1600 04, B1605 04 | B1544 01 | --
Left/Right Mirror Motor Vertical Control | B1544 04, B1600 02 | B1544 04, B1600 04 | B1600 01 | --
Low Reference | -- | B1580, B1590 | -- | --
1. Memory Recall Malfunction

### Circuit/System Description

The Driver Door Switch (DDS) or Passenger Door Switch (PDS) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. When the mirror is commanded up and down, voltage or ground is supplied to the mirror vertical motor through the mirror motor up/down control circuit and voltage or ground is supplied through the mirror motor common circuit.

Horizontal controls operate in the same manner with the mirror motor left/right control circuit supplying voltage or ground and the mirror motor common circuit suppling voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.

The Driver Door Switch (DDS) and Passenger Door Switch (PDS) determine the position of the outside rearview mirrors based on inputs from two mirror position sensors, one for vertical position, the other for horizontal position. 5 volts is applied to each sensor through a shared 5-volt reference circuit and a shared low reference circuit supplies ground. Each sensor has an individual signal circuit which provides position voltage to the DDS/PDS.

### Reference Information

#### Schematic Reference

Outside Rearview Mirror Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Outside Mirror Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Idle, Right, and Left.

⇒ | If the parameter does not cycle between the specified values, replace the DDS.

2. Observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right.

⇒ | If the parameter does not cycle between the specified values, replace the DDS.

3. Using the mirror directional switch operate the left and right outside mirrors to move up, down, left and right. The mirrors should move in the commanded directions.

⇒ | If a mirror does not move in all the commanded directions refer to, Mirror Motor Circuit Test.

4. Operate the memory 1 and 2 recall switches. The outside rearview mirrors should adjust to the stored memory settings.

⇒ | If a mirror does not adjust to the stored memory setting refer to, Mirror Position Sensor Circuit Test.

### Circuit/System Testing

#### Mirror Position Sensor Circuit Test

1. Ignition OFF, disconnect the harness connector X1 at the appropriate outside rearview mirror.
2. Wait 1 minute, test for less than 1.0 ohm between the low reference circuit terminal 10 and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the appropriate door switch.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 7 and ground.

⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the door switch.

⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

4. Install a 3A fused jumper wire between the signal circuit terminal 4 and the 5-volt reference circuit terminal 7. Verify the scan tool Mirror Vertical Position parameter is greater than 4.8 volts.

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

5. Install a 3A fused jumper wire between the signal circuit terminal 5 and the 5-volt reference circuit terminal 7. Verify the scan tool Mirror Horizontal Position parameter is greater than 4.8 volts.

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

6. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 10. Verify the scan tool Mirror Vertical Position parameter is less than 0.2 volt.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door switch.

7. Install a 3A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 10. Verify the scan tool Mirror Horizontal Position parameter is less than 0.2 volt.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door switch.

8. If all circuits test normal, test or replace the appropriate outside rearview mirror motor.

#### Mirror Motor Circuit Test

1. Ignition OFF, disconnect the X1 (RPO DS3) or X2 (RPO W49) harness connector at the outside rearview mirror.
2. Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 6.
3. Command the mirror left and right using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded to the left and right.

⇒ | If the test lamp is always ON, test the control circuits for a short to voltage. If the circuit tests normal, replace the appropriate door switch.

⇒ | If the test lamp is always OFF, test the control circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

4. Install a test lamp between the control circuit terminal 1 and the control circuit terminal 6.
5. Command the mirror up and down using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded up and down.

⇒ | If the test lamp is always ON, test the control circuits for a short to voltage. If the circuit tests normal, replace the door switch.

⇒ | If the test lamp is always OFF, test the control circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

6. If all circuits test normal, test or replace the outside rearview mirror motor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Outside Rearview Mirror Motor Replacement

• | Control Module References for DDS or PDS replacement, setup, and programming

## Power Mirrors Inoperative w/W49

### 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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Left/Right Mirror Motor Horizontal Control | B1544 04, B1605 02 | B1544 04, B1605 04 | B1605 01 | --
Left/Right Mirror Motor Common Control | B1544 04, B1600 04, B1605 04, B1544 02 | B1544 04, B1600 04, B1605 04 | B1544 01 | --
Left/Right Mirror Motor Vertical Control | B1544 04, B1600 02 | B1544 04, B1600 04 | B1600 01 | --

### Circuit/System Description

The Driver Door Switch (DDS) or Passenger Door Switch (PDS) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. When the mirror is commanded up and down, voltage or ground is supplied to the mirror vertical motor through the mirror motor up/down control circuit and voltage or ground is supplied through the mirror motor common circuit.

Horizontal controls operate in the same manner with the mirror motor left/right control circuit supplying voltage or ground and the mirror motor common circuit suppling voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.

### Reference Information

#### Schematic Reference

Outside Rearview Mirror Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Outside Mirror Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Idle, Right, and Left.

⇒ | If the parameter does not cycle between the specified values, replace the DDS.

2. Observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right.

⇒ | If the parameter does not cycle between the specified values, replace the DDS.

3. Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the commanded direction.

### Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the outside rearview mirror.
2. Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 6.
3. Command the mirror left and right using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded to the left and right.

⇒ | If the test lamp is always ON, test both control circuits for a short to voltage. If the circuit tests normal, replace the appropriate door switch.

⇒ | If the test lamp is always OFF, test both control circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

4. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 6.
5. Command the mirror up and down using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded up and down.

⇒ | If the test lamp is always ON, test both control circuits for a short to voltage. If the circuit tests normal, replace the door switch.

⇒ | If the test lamp is always OFF, test both control circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the door switch.

6. If all circuits test normal, test or replace the outside rearview mirror motor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Outside Rearview Mirror Motor Replacement

• | Control Module References for DDS or PDS replacement, setup, and programming

## Power Mirrors Inoperative w/DS3

### 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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Left/Right Mirror Motor Horizontal Control | 1 | 1 | -- | --
Left/Right Mirror Motor Vertical Control | 1 | 1 | -- | --
Left/Right Mirror Motor Common Control | 1 | 1 | -- | --
1. 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 PWR/MIR fuse in the IP fuse block and when a movement position switch is selected, voltage is sent to the commanded mirror via a mirror control control. 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 Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Outside Mirror Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Ignition ON, with the mirror selector switch in the DRIVER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The driver mirror should move in the commanded direction.
2. With the mirror selector switch in the PASSENGER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The passenger mirror should move in the commanded direction.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the outside rearview mirror switch.
2. Test for less than 10 ohms between the ground circuit terminal G and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal B and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, connect the harness connector at the outside rearview mirror switch.
5. Disconnect the harness connector at the appropriate outside rearview mirror.
6. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 6.
7. Operate the vertical switch UP and DOWN. The test lamp should turn ON when commanding the UP and DOWN states.

⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on the control circuits. If the circuits test normal, replace the power mirror switch.

8. Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 6.
9. Operate the horizontal switch LEFT and RIGHT. The test lamp should turn ON when commanding the LEFT and RIGHT states.

⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on the control circuits. If the circuits test normal, replace the power mirror switch.

10. If all circuits test normal, test or replace the outside rearview mirror motor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Outside Rearview Mirror Motor Replacement

• | Control Module References for DDS or PDS replacement, setup and programming