DTC B0193
| DTC B0193 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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| • |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 |
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Blower Motor Control Module B+
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B0193 06
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B0193 06
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-
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-
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Blower Motor B+
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1
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1
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-
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-
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Blower Motor Control Module Control
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B0193 06
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B0193 06
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B0193 01
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-
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Blower Motor Controls
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2
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1
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1
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-
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Blower Motor Control Module Ground
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-
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1
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-
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-
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1. Blower Motor Inoperative
2. Blower Motor Always On |
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| 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 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.
| Conditions for Running the DTC |
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Ignition ON
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The HVAC control module is ON.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the X2 harness connector at the K8 Blower Motor Control Module.
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| 2. |
Verify that a test lamp illuminates between the B+ and ground circuit terminal 5 X2.
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| 3. |
If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
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| 4. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 X2 at the K8 Blower Motor Control Module harness connector and ground.
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| 5. |
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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| 6. |
Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
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| 7. |
Ignition ON, test for less than 0.3 V between the control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector and ground.
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| 8. |
If greater than the specified range, test the control circuit for a short to voltage.
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| 9. |
Ignition OFF, test for infinite resistance between the control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector and ground.
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| 10. |
If less than the specified range, test the control circuit for a short to ground.
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| 11. |
Test for less than 5 Ω between the K33 HVAC Control Module control circuit terminal 15 X2 and control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector.
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| 12. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 13. |
If all circuits test normal, replace the K8 Blower Motor Control Module and verify the DTC does not reset.
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| 14. |
If the DTC resets, replace the K33 HVAC Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Control Module References
for HVAC control module replacement, setup, and programming
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Heater and Blower and Air Conditioning Control Module Replacement
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