Orlando

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 : Automatic

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. Ignition OFF, disconnect the X1 harness connector at the K8 Fan Motor Control Module, ignition ON.
2. Verify that a test lamp illuminates between the B+ circuit terminal 6 X1 at the K8 Fan Motor Control Module harness connector and earth.

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

2.1.	Ignition OFF.

2.2.	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

2.1.	Ignition OFF.

2.2.	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

2.3.	Disconnect the harness connector at the M8 Blower Motor and the X2 harness connector at the K8 Blower Motor Control Module.

2.4.	Test for infinite resistance between the B+ circuit terminal 1 X2 and earth.

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

⇓	If infinite resistance

2.5.	Connect the harness connector at the M8 Fan Motor.

2.6.	Install a 40 A fused jumper wire between the B+ circuit terminal 1 X2 and B+ and verify the fuse is good.

⇒	If the fuse is open, replace the M8 Fan Motor.

⇒	If the fuse is good, replace the K8 Fan Motor Control Module.

⇓	If the test lamp illuminates

3. Verify that a test lamp illuminates between the B+ circuit terminal 6 X1 and ground circuit terminal 5 X1.

⇒	If the test lamp does not illuminate

Repair the open/high resistance in the circuit.

⇓	If the test lamp illuminates

4. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module, ignition ON.
5. Test for less than 0.3 V between the control circuit terminal 3 X1 at the K8 Blower Motor Control Module harness connector and ground.

⇒	If greater than 0.3 V

Repair the short to voltage on the circuit.

⇓	If less than 0.3 V

6. Ignition OFF.
7. Test for infinite resistance between the control circuit terminal 3 X1 at the K8 Fan Motor Control Module harness connector and earth.

⇒	If less than infinite resistance

Repair the short to ground on the circuit.

⇓	If infinite resistance

8. Test for less than 5 Ω between the K33 HVAC Control Module control circuit terminal 15 X2 and control circuit terminal 3 X1 at the K8 Blower Motor Control Module harness connector.

⇒	If greater than 5 Ω

Repair the open/high resistance in the circuit.

⇓	If less than 5 Ω

9. Replace the K8 Fan Motor Control Module and verify the DTC does not reset.

⇒	If DTC resets

Replace the K33 HVAC Control Module.

⇓	If DTC does not reset

10. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.