Thursday, June 3, 2021

2010 Cadillac Truck SRX FWD V6-3.0L Page 376

2010 Cadillac Truck SRX FWD V6-3.0L Page 376



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



1. Verify that DTC B023A 02 is not present.



瀚慖f DTC is present, refer to Actuator Power Supply Malfunction.



2. Verify that DTC B0223, B022A, B0233, B0408 or B0418 is not set.



瀚慖f DTC is present, refer to Actuator Malfunction.



Circuit/System Testing



Actuator Power Supply Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate actuator.



2. Ignition ON, verify that a test lamp illuminates between the 12 volt referance circuit terminal 2 and ground.



瀚慖f the test lamp does not illuminate, test the 12 volt referance circuit for a short to ground or an open/high resistance. If the circuit tests



normal test or replace the K33 HVAC control module.



Actuator Malfunction



1. Ignition OFF, disconnect the X3 and X4 harness connector at the K33 HVAC Control Module.



2. Ignition ON, test for 80-200 ohm between the 12 V reference voltage circuit terminal 15 X3 and each control circuit terminal of the



appropriate actuator.



瀚慖f less than the specified range, test for the 12 V reference voltage circuit and the control circuit for a short circuit. If the circuits test



normal, replace the appropriate actuator.



瀚慖f greater than the specified range, test the 12 V reference voltage circuit and the control circuit for an open/high resistance. If the circuits



test normal, replace the appropriate actuator.



3. If all circuits test normal, replace the K33 HVAC Control Module



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and



programming



B0428



DTC B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.

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