2010 Cadillac CTS Sedan AWD V6-3.6L Page 207

2010 Cadillac CTS Sedan AWD V6-3.6L Page 207

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC B0283 02

- Electric Rear Defrost Circuit Short to Ground

DTC B0283 05

- Electric Rear Defrost Circuit Short to Battery or Open

Diagnostic Fault Information

Circuit/System Description

When the rear window defogger switch is activated, the radio/HVAC control panel sends a serial data message to the HVAC control module

requesting the rear defogger be activated. The HVAC control module responds by energizing the rear defog relay by applying voltage to the rear

defog relay control circuit. When the rear defog relay coil is energized, the switch contacts of the rear defog relay close allowing battery voltage to

flow from the REAR DEFOG fuse through the closed switch contacts and out the relay switched output to the rear window defogger grid.

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

B0283 02

The HVAC control module detects a short to ground in the rear defog relay control circuit for 1 second or greater.

B0283 05

The HVAC control module detects a short to voltage or an open/high resistance in the rear defog relay control circuit or an open/high resistance it

the rear defog relay ground circuit for greater than 1 second.

Action Taken When the DTC Sets

B0283 02

The rear window defogger will be inoperative.

B0283 05

The rear window defogger will be inoperative or will operate continuously.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Defogger Schematics (See: Windows and Glass/Heated Glass Element/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Rear Window Defogger Description and Operation (See: Windows and Glass/Windows/Description and Operation/Rear Window Defogger