Diagnostic Routine E

Diagnostic Routine E

Diagnostic Overview

The Heated Mirror Is Inoperative

Refer to Wiring Diagram Set 124 for schematic and connector information Electrical Diagrams.

Refer to Wiring Diagram Set 56 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Rear View Mirrors - Exterior, Heated .

Visual Inspection and Diagnostic Pre-checks

- Inspect BJB (Battery Junction Box) fuse 47 (7.5A)

- Inspect the exterior mirror glass

- Inspect the exterior mirror

Pinpoint Test

1. CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM

1. Ignition ON.

2. With the engine running, activate the rear window defrost.

3. Using a infrared temperature gun or equivalent measure the temperature of the rear window glass for approximately 30 seconds noting changes in temperature.

Does the temperature of the rear window glass rise?






2. CHECK THE OPERATION OF THE HEATED EXTERIOR REAR VIEW MIRRORS

1. With the rear window defrost ON, using a infrared temperature gun or equivalent measure the temperature of the LH (Left Hand) and RH (Right Hand) exterior rear view mirror glass for approximately 30 seconds noting changes in temperature.

Does at least one heated mirror glass operate correctly?






3. CHECK THE VOLTAGE TO THE LH (Left Hand) HEATED EXTERIOR REAR VIEW MIRROR GLASS

1. Ignition OFF.

2. Disconnect: LH (Left Hand) Exterior Mirror C521.

3. Ignition ON.

4. With the engine running, activate the rear window defrost.

5. Measure:





Is the voltage greater than 11 volts?






4. CHECK THE LH (Left Hand) EXTERIOR REAR VIEW MIRROR GROUND CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Measure:





Is the resistance less than 3 ohms?






5. CHECK THE VOLTAGE TO THE RH (Right Hand) HEATED EXTERIOR REAR VIEW MIRROR GLASS

1. Disconnect: RH (Right Hand) Exterior Mirror C626.

2. Ignition ON.

3. With the engine running, activate the rear window defrost.

4. Measure:





Is the voltage greater than 11 volts?






6. CHECK THE RH (Right Hand) EXTERIOR REAR VIEW MIRROR GROUND CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Measure:





Is the resistance less than 3 ohms?