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The HVAC control module monitors the voltage level on the supply voltage circuit of the rear Conditions for Running the DTC Battery voltage must be between 9-16 volts. Conditions for Setting the DTC The HVAC control module detects a short to ground or open/high resistance in the rear defog Action Taken When the DTC Sets The HVAC control module stores the DTC to memory. The rear window defogger will not operate. 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 Connector End View Reference Component Connector End Views Description and Operation Rear Window Defogger Description and Operation Electrical Information Reference Circuit Testing
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification Ignition ON, observe the operation of the defogger grid while pressing and depressing the rear Circuit/System Testing 1. Ignition OFF, disconnect the REAR DEFOG relay. 2. Test for less than 1.0 ohm between the ground circuit terminal 85 and ground. If greater than the specified range, test the relay coil ground circuit for an open/high 3. Connect a test lamp between the control circuit terminal 86 and ground. 4. Ignition ON, command the defogger grid ON and OFF by pressing and depressing the rear defogger switch. The test lamp should turn ON and OFF when changing between the If the test lamp is always ON, test the control circuit for a short to voltage. If the If the test lamp is always OFF, test the control circuit for a short to ground or an 5. If all circuits test normal, test or replace the REAR DEFOG relay. Component Testing 1. Ignition OFF, disconnect the REAR DEFOG relay. 2. Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay. 3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
30 and 85 85 and 87 If not the specified value, replace the relay. 4. Install a 25-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 If greater than the specified range, replace the relay. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Control Module References for HVAC control module replacement, setup and DTC B3205 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. DTC Descriptors DTC B3205 00 Window Inactive Over Current Fault DTC B3205 0B Window Motor Fast Over Current Fault Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Driver Door Switch B+ 1, 3 1 - -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The driver door switch (DDS) and passenger door switch (PDS) control the power window Conditions for Running the DTC Battery voltage must be between 9-16 volts. LR Window Switch B+ 1, 3 3 - - Passenger Door Switch B+ 2, 4 2 - - RR Window Switch B+ 2, 4 4 - - Power Window Switch Right B3823 00 B3823 00 B3823 00 - Power Window Switch Right B3822 00 B3822 00 B3822 00 - Power Window Switch Left B3820 00 B3820 00 B3820 00 - Power Window Switch Left B3819 00 B3819 00 B3819 00 - Power Window Lockout Left B3821 00 B3821 00 B3821 00 - Power Window Lockout Right B3824 00 B3824 00 B3824 00 - LR Window Motor Control 3 3 3 - Passenger Window Motor B3205 00 B3205 0B B3205 00 - RR Window Motor Control 4 4 4 - Driver Window Motor B3205 00 B3205 0B B3205 00 - LR Window Switch Ground - 3 3 - RR Window Switch Ground - 4 4 - 1. Driver Window Malfunction
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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