2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 255
* 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 Testing
1. Ignition OFF, disconnect the X1 harness connector at the K8 Blower Motor Control Module.
2. Test for less than 5 ohm between the ground circuit X1 terminal 5 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit X1 terminal 6 and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Connect a DMM between the control circuit X1 terminal 3 and B+.
5. Cycle the blower motor from OFF to HIGH. The voltage should increase while changing between the commanded states.
瀚慖f voltage remains greater than 11.5 V while changing between the commanded states, test the control circuit for a short to voltage. If the
circuit test normal, replace the K33 HVAC Control Module.
瀚慖f voltage remains less than 1.0 V while changing between the commanded states, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
瀚慖f voltage is between 1.0-11.5 V and does not increase when changing between the commanded states, replace the K33 HVAC Control
Module.
6. Ignition OFF, connect the X1 harness connector at the K8 Blower Motor Control Module and disconnect the harness connector at the M8
Blower Motor.
7. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K8 Blower Motor Control Module.
8. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.
9. Turn the blower motor on high speed then to low speed. The test lamp intensity should be bright when in high speed and very dim or off
when the blower is on low speed.
瀚慖f the test lamp intensity does not vary, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the
circuit tests normal, replace the K8 Blower Motor Control Module.
10. If all circuits test normal, replace the M8 Blower Motor.
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
B0233
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
