DTC B0228, B0413, B0423, Or B3779
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1 2007 Chevrolet Silverado 1500 : Heating, Ventilation, & Air Conditioning > HVAC Systems - Manual > Diagnostic Information And Procedures > DTC B0228, B0413, B0423, Or B3779 DTC B0228, B0413, B0423, Or B3779 DTC B0228, B0413, B0423, OR B3779 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis (Refer To List 1) for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B : Recirculate Position Feedback Circuit Short to Ground (CJ3) DTC B : Recirculate Position Feedback Circuit Short to Battery or Open (CJ3) DTC B : Recirculate Position Circuit Actuator Stuck (CJ3) DTC B : Temperature Control 1 Feedback Circuit Short to Ground (CJ3) DTC B : Temperature Control 1 Feedback Circuit Short to Battery or Open (CJ3) DTC B : Temperature Control 1 Feedback Circuit Actuator Stuck Open (CJ3) DTC B : Temperature Control 2 Feedback Circuit Short to Ground (CJ3+C67) DTC B : Temperature Control 2 Feedback Circuit Short to Battery or Open (CJ3+C67) DTC B : Temperature Control 2 Circuit Actuator Stuck (CJ3+C67) DTC B : Air Flow Control 9 Feedback Circuit Short to Ground (CJ3) DTC B : Air Flow Control 9 Feedback Circuit Short to Battery or Open (CJ3) DTC B : Air Flow Control 9 Circuit Actuator Stuck (CJ3) Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Recirculation Door Control Circuit Recirculation Door Ignition 3 Voltage Recirculation Door Position Signal Recirculation 5-Volt Reference Circuit Short to Voltage Signal Performance B B B B B B B B B Recirculation Low Reference Circuit B B Control Circuit Ignition 3 Voltage Position Signal B B B B B B B B Driver Air Temperature 5-Volt B Reference Circuit 1/5
2 B Reference Circuit Driver Air Temperature Low Reference Circuit Door Control Circuit Door Ignition 3 Voltage Door Position Signal 5- Volt Reference Circuit Low Reference Circuit B B B B B B B B B B B B Mode Door Control Circuit B B B Mode Door Ignition 3 Voltage B B Mode Door Position Signal B B B Mode 5-Volt Reference Circuit B Mode Low Reference Circuit B B Circuit/System Description The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The control circuit uses either a 0, 2.5 or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions. B0228 This DTC is for the recirculate actuator. B0413 This DTC is for the drivers air temperature actuator. B0423 This DTC is for the passenger air temperature actuator. B3779 This DTC is for the mode actuator. Conditions for Running the DTC The ignition is ON. Ignition voltage is between 9-16 volts. The HVAC module is ON. Conditions for Setting the DTC The actual door position differs from the commanded door position by more than 4 counts or the HVAC control module detects the door position signal circuit is less than 6 counts or greater than 250 counts. Action Taken When the DTC Sets The control circuit is deactivated for the appropriate actuator. Conditions for Clearing the DTC The DTC becomes history when the HVAC control module no longer detects the condition that set the DTC. The history DTC will clear after 50 fault-free ignition cycles. The DTC can be cleared with a scan tool /5
3 Reference Information Schematic Reference HVAC Schematics Connector End View Reference HVAC Connector End Views Description and Operation Air Delivery Description and Operation Air Temperature Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Scan Tool Output Controls Scan Tool Data List Scan Tool Data Definitions Circuit/System Verification Ignition ON, operate the applicable actuator using the HVAC controls. The applicable scan tool parameter should transition from 6 counts to 250 counts. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the applicable actuator. 2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 7 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module. 3. Ignition ON, test for volts between the 5-volt reference circuit terminal 10 and ground. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. If less then specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module. 4. Verify the applicable scan tool parameter is less than 7 counts. If greater than the specified range, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the HVAC control module. 5. Install a 3A fused jumper wire between the signal circuit terminal /5
4 and the low reference circuit terminal 7. Verify the applicable scan tool parameter is greater than 250 counts. If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module. 6. Verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. 7. Test for 2.5 volts between the control circuit terminal 6 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. If less then specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module. 8. Install a DMM between the control circuit terminal 6 and ground. Command the actuator in each direction. Voltage on the control circuit should change from 0 volts when commanding the actuator in one direction to 5 volts in the other direction and return to 2.5 volts in the at rest state. If the voltage does not change as specified, replace the HVAC control module. 9. If all circuits test normal, test or replace the applicable actuator. Repair Instructions Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Temperature Valve Actuator Replacement - Right Side (Refer To List 2) Temperature Valve Actuator Replacement - Left Side (Refer To List 3) Mode Actuator Replacement Recirculation Actuator Replacement (Refer To List 4) REFER TO LIST: List 1 List 2 Diagnostic Overview, Starting Point, And Programming / Vehicle Diagnostic Information / Diagnostic Information And Procedures / Strategy Based Diagnosis General Information / General Information / Introduction / Strategy Based Diagnosis HVAC / HVAC - Automatic / Repair Instructions / Temperature Valve Actuator Replacement - Right Side /5
5 List 3 List 4 HVAC / HVAC - Manual / Repair Instructions / Temperature Valve Actuator Replacement - Right Side HVAC / HVAC - Automatic / Repair Instructions / Temperature Valve Actuator Replacement - Left Side HVAC / HVAC - Manual / Repair Instructions / Temperature Valve Actuator Replacement - Left Side HVAC / HVAC - Automatic / Repair Instructions / Air Inlet Valve Actuator Replacement HVAC / HVAC - Manual / Repair Instructions / Air Inlet Valve Actuator Replacement /5
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