2010 Cadillac Truck SRX AWD V6-3.0L Page 372

2010 Cadillac Truck SRX AWD V6-3.0L Page 372

* 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

DTC B022A 06

- Recirculate Position Command 2 Circuit Low Voltage/Open

DTC B0233 01

- Air Flow Control Circuit Short to Battery

DTC B0233 06

- Air Flow Control Circuit Low Voltage/Open

DTC B023A 02

- HVAC Actuators Supply Voltage Short to Ground

DTC B0408 01

- Main Temperature Control Circuit Short to Battery

DTC B0408 06

- Main Temperature Control Circuit Low Voltage/Open

DTC B0418 01

- Right Temperature Control Circuit Short to Battery

DTC B0418 06

- Right Temperature Control Circuit Low Voltage/Open

DTC B0428 01

- Rear Temperature Control Circuit Short to Battery

DTC B0428 06

- Rear Temperature Control Circuit Low Voltage/Open

DTC B3531 01

- Rear Air Flow Control Circuit Short to Battery

DTC B3531 06

- Rear Air Flow Control Circuit Low Voltage/Open

Circuit/System Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control.

With the appropriate switches at the Radio/HVAC control, the desired air temperature door position, air distribution door position and recirculation

door position can be put in. The selected values are passed to the HVAC control module via the LIN-Bus. The HVAC control module supplies a 12

V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors put the

appropriate door into the calculated position, in order to reach the put in temperature/position.

Conditions for Running the DTC

* Ignition ON.

* The HVAC control module is ON.

Conditions for Setting the DTC