Chevrolet Cruze Repair Manual: Rear Window Defogger Description and Operation

Chevrolet Cruze Repair Manual / Body systems / Fixed and Movable Windows / Rear Window Defogger Description and Operation

Rear Window Defogger System Components

The rear window defogger system consists of the following components:

HVAC Control Module
HVAC Control Head
Rear Window Defogger Relay
Rear Defogger Grid
F28UA 40A Fuse

Rear Window Defogger Operation

The rear defog control system utilizes a single zone backlight design, driven with a single relay configuration. Additionally, up to two outside rear view mirrors can be heated if required. A switch for the customer to control the system is provided within the HVAC control head. Also included in the HVAC control head is an indicator to inform the customer with the current state of the system. The system is only operational when engine is running or during remote start.

Pressing the heated rear window switch on the HVAC control face plate causes the HVAC control head to send a serial data message to the HVAC control module requesting rear window defog operation. The HVAC control module upon receipt of the serial data message will provide voltage to the coil side of the rear window defogger relay, this will energize the relay causing the relay switch contacts to close allowing B+ voltage to flow through the rear defogger grid control circuit to the rear defogger grid.

When the rear heated window switch is pressed and the engine is running, the rear defog control system will remain active for 10 minutes.

After the initial cycle has lapsed, pressing the switch again will continue rear window defogger operation, but the cycle will only last 5 minutes. The rear defog control system will function continuously if the vehicle speed is greater than 70 kilometers per hour (45 mph).

Stationary Window Description

Most stationary windows, specifically windshields, are retained to the body with urethane adhesive which adheres the window to the body.

This increases structural integrity. The reinstallation of windows with urethane adhesive requires complete replacement of the urethane adhesive bead: The extended method (also known as long method, full strip or full cut) is the only recommended procedure for General Motors Vehicle.

Special Tools and Equipment

Horns

Power Windows Description and Operation

Power Windows System Components The power window system consists of the following components: Driver window switch Passenger window switch Left rear window switch Right rear window switch ...

Horns

Specifications Horn Replacement Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement. Horn Nut Caution: Refer to Fastener Caution in the ...

Other materials:

Engine Oil
To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: • Always use engine oil approved to the proper specification and of the proper viscosity grade. See “Selecting the Ri ...

Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the Preface section. Warning: Refer to Collision Sectioning Warning in the Preface section. Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section. Disable the SIR System. Refer to SIR Disabling ...

Front Side Door Check Replacement
Prliminary Procedure Remove front side door trim panel. Refer to Front Side Door Trim Replacement Remove the front side door water deflector. Refer to Front Side Door Water Deflector Replacement Front Side Door Check Link Bolt Caution: Refer to Fastener Caution in the ...