2010 Cadillac Truck SRX AWD V6-3.0L Page 250
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 B0208 01
- Rear Blower Motor Speed Circuit Short to Battery
DTC B0208 06
- Rear Blower Motor Speed Circuit Low Voltage/Open
Circuit/System Description
The blower motor control module - auxiliary is an interface between the HVAC control module and the blower motor. The blower motor speed
control from the HVAC control module, battery positive and ground circuits enable the blower motor control module - auxiliary to operate. The
HVAC control module provides a pulse width modulation (PWM) signal to the blower motor control module - auxiliary in order to command the
blower motor speed. The blower motor control module - auxiliary transfers the PWM signal into a corresponding blower motor voltage. The
voltage resides between 2-13 V and changes linear to the height of the PWM signal.
Conditions for Running the DTC
* Ignition ON.
* The HVAC control module is ON.
Conditions for Setting the DTC
B0208 01
The voltage at the HVAC control module output to the blower motor control module - auxiliary is always high.
B0208 06
The voltage at the HVAC control module output to the blower motor control module - auxiliary is always low or floating.
Action Taken When the DTC Sets
The blower motor is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation)
Electrical Information Reference
* 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
