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).
Fixed and Movable Windows
BODY SYSTEMS
S e c tion 04
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CHEVROLET CRUZE BODY REPAIR MANUAL 2010
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