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DTC B0193

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0193 01: Front Blower Motor Speed Circuit Short to Battery

DTC B0193 06: Front Blower Motor Speed Circuit Low Voltage/Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Blower Motor Control Module B+

1

1

--

--

Blower Motor Speed Control

B0193 06

B0193 06

B0193 01

--

Blower Motor Control Module Ground

--

1

1

--

1. Blower Motor inoperative

Circuit/System Description

The blower motor control module is an interface between the HVAC control module and the blower motor. The blower motor speed control signal 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 interprets the PWM signal into a corresponding blower motor voltage. The voltage varies between 2-13 V, linear to the frequency of the PWM signal.

Conditions for Running the DTC
    • Ignition ON
    • The blower motor is switched ON.

Conditions for Setting the DTC

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.

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

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic HVAC Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

    Note: It may take up to 2 minutes for all vehicle systems to power down.

  1. Ignition OFF. Disconnect the harness connector X2 at the K33 HVAC Control Module.
  2. Test for less than 5 Ω between the ground circuit connector terminal 8 and ground.
    3. [ARW-LISTFAIL]

  3. If 5 Ω or greater

    4. [/ARW-LISTFAIL]
    2.1. Ignition OFF.
    2.2. Test for less than 2 Ω in the ground circuit end to end.
    [ARW-LISTFAIL]

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

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

    6. [/ARW-LISTFAIL] [ARW-LISTPASS]

  6. If less than 5 Ω

    7. [/ARW-LISTPASS]
  7. Ignition ON Test for 4.8-5.2 V between the signal circuit connector terminal 15 and ground.
    8. [ARW-LISTFAIL]

  8. If less than 4.8 V

    9. [/ARW-LISTFAIL]
    3.1. Ignition OFF. Disconnect the harness connector X1 at the K8 Blower Motor Control Module.
    3.2. Test for infinite resistance between the signal circuit and ground.
    [ARW-LISTFAIL]

  9. If less than infinite resistance, repair the short to ground in the circuit.

    10. [/ARW-LISTFAIL][ARW-LISTPASS]

  10. If infinite resistance

    11. [/ARW-LISTPASS]
    3.3. Test for less than 2 Ω in the signal circuit end to end.
    [ARW-LISTFAIL]

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

  12. If less than 2 Ω, refer to Blower Motor Malfunction .

    13. [/ARW-LISTFAIL] [ARW-LISTFAIL]

  13. If greater than 5.2 V

    14. [/ARW-LISTFAIL]
    3.1. Ignition OFF. Disconnect the harness connector X1 at the K8 Blower Motor Control Module.
    3.2. Ignition ON Test for less than 1 V between the signal circuit connector terminal 15 and ground.
    [ARW-LISTFAIL]

  14. If 1 V or greater, repair the short to voltage in the circuit.

    15. [/ARW-LISTFAIL][ARW-LISTFAIL]

  15. If less than 1 V, replace the K8 Blower Motor Control Module.

    16. [/ARW-LISTFAIL] [ARW-LISTPASS]

  16. If between 4.8-5.2 V

    17. [/ARW-LISTPASS]
  17. Replace the K33 HVAC Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Heater and Blower and Air Conditioning Control Module Replacement
    •  Control Module References
   


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