2010 Cadillac Truck SRX AWD V6-3.0L Page 663

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2010 Cadillac Truck SRX AWD V6-3.0L Page 663



- 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



B023A 02



The stepper motors supply output is shorted to ground.



B0223 01, B022A 01, B0233 01, B0408 01, B0418 01, B0428 01 or B3531 01



At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to voltage when motor starts moving. Faults are not



detected when motor is already running or target position is already reached.



B0223 06, B022A 06, B0233 06, B0408 06, B0418 06, B0428 06 or B3531 06



At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to ground or open when motor starts moving.



Faults are not detected when motor is already running or target position is already reached.



Action Taken When the DTC Sets



B023A 02



* The affected output will be switched off for hardware protection.



* All stepper motors are deactivated.



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



* The affected output will be switched off for hardware protection.

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