Volt

DTC B0193

The blower motor control module 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 to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the blower motor control module in order to command the blower motor speed. The blower motor control module 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.

B0193 01

The voltage at the HVAC control module output to the blower motor control module is always high.

B0193 06

The voltage at the HVAC control module output to the blower motor control module is always low or floating.

The blower motor is inoperative.

The condition for setting the DTC is no longer present.

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic HVAC Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K8 blower motor control module. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

⇒	If 10 Ω or greater

2.1.	Vehicle OFF.

2.2.	Test for less than 2 Ω in the ground circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, repair the open/high resistance in the ground connection.

⇓	If less than 10 Ω

3. Vehicle in Service Mode, verify a test lamp illuminates between B+ circuit terminal 6 and ground.

⇒	If the test lamp does not illuminate and the circuit fuse is good

3.1.	Vehicle OFF.

3.2.	Test for less than 2 Ω in the B+ circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

⇒	If the test lamp does not illuminate and the circuit fuse is open

3.1.	Vehicle OFF.

3.2.	Test for infinite resistance between the B+ circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇒	If infinite resistance, replace the K8 blower motor control module.

⇓	If the test lamp illuminates

4. Connect a DMM between the control circuit X1 terminal 3 and the B+ circuit terminal 6.
5. Verify the proper voltages when changing the blower speed positions, with the HVAC in Comfort Mode.

•	OFF 12.0 V-11.0 V

•	Low 11.0 V-9.0 V

•	Med 1 9.0 V-7.0 V

•	Med 2 7.0 V-6.0 V

•	Med 3 6.0 V-5.0 V

•	Med 4 5.0 V-3.0 V

•	HI 2.0 V-1.0 V

⇒	If not within the specified range

5.1.	Vehicle OFF, disconnect the harness connector at the K33 HVAC control module.

5.2.	Test for less than 1 V between the control circuit and ground.

⇒	If 1 V or greater, repair the short to voltage on the circuit.

⇓	If less than 1 V

5.3.	Test for infinite resistance between the control circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇒	If infinite resistance, replace the K33 HVAC control module.

⇓	If within the specified range

6. Connect the X1 harness connector at the K8 blower motor control module. Disconnect the harness connector at the M8 blower motor..
7. Connect a DMM between the control circuit terminal B and B+.
8. Verify the proper voltages when changing the blower speed positions, with the HVAC in Comfort Mode.

•

OFF 0 V

•	Low 2.0 V-3.0 V

•	Med 1 3.0 V-4.5 V

•	Med 2 4.5 V-6.5 V

•	Med 3 6.5 V-8.5 V

•	Med 4 8.5 V-10.0 V

•	HI 10.0 V-12.0 V

⇒	If not within the specified range

8.1.	Vehicle OFF, disconnect the harness connector X2 at the K8 blower motor control module.

8.2.	Test for less than 1 V between the control circuit and ground.

⇒	If 1 V or greater, repair the short to voltage on the circuit.

⇓	If less than 1 V

8.3.	Test for infinite resistance between the control circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇒	If infinite resistance, replace the K8 blower motor control module.

⇓	If within the specified range

9. Verify a test lamp illuminates between B+ circuit terminal A and ground.

⇒	If the test lamp does not illuminate

9.1.	Vehicle OFF.

9.2.	Test for less than 2 Ω in the B+ circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇓	If less than 2 Ω.

9.3.	Test for infinite resistance between the B+ circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇒	If infinite resistance, replace the M8 blower motor.

⇓	If the test lamp illuminates

10. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.