2010 Cadillac Truck SRX FWD V6-3.0L Page 251

2010 Cadillac Truck SRX FWD V6-3.0L Page 251

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the K8A Blower Motor Control Module.

2. Test for less than 5 ohm between the ground circuit X1 terminal 4 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 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.

4. Connect a DMM between the control circuit X1 terminal 1 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 K8A Blower Motor Control Module and disconnect the harness connector at the M8A

Blower Motor.

7. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal B 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 K8A Blower Motor Control Module.

8. Connect a test lamp between the B+ circuit terminal B and the control circuit terminal A.

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 K8A Blower Motor Control Module.

10. If all circuits test normal, replace the M8A 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

B0223

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.

DTC Descriptor

DTC B0223 01

- Recirculate Position Command 1 Circuit Short to Battery

DTC B0223 06

- Recirculate Position Command 1 Circuit Low Voltage/Open

DTC B022A 01

- Recirculate Position Command 2 Circuit Short to Battery