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 Descriptor
DTC B0193 01: Front Blower Motor Speed Circuit Short to BatteryDTC B0193 06: Front Blower Motor Speed Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Blower Motor Control Module B+ | B0193 06 | B0193 06 | -- | -- |
Blower Motor Control Module Control | B0193 06 | B0193 06 | B0193 01 | -- |
Blower Motor Control Module Ground | -- | B0193 06 | -- | -- |
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
| • | Ignition ON. |
| • | The HVAC control module is 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
Connector End View Reference
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module and the X2 harness connector at the K8 Blower Motor Control Module.
- 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.
- Verify that a test lamp illuminates between the B+ circuit terminal 6 (X2) and ground circuit terminal 5 (X2).
- Test for less than 0.3 V between the control circuit terminal 15 (X2) at the K33 HVAC Control Module harness connector and ground.
- Ignition OFF, test for infinite resistance between the control circuit terminal 15 (X2) at the K33 HVAC Control Module harness connector and ground.
- 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.
- If all circuits test normal, replace the K8 Blower Motor Control Module and verify the DTC does not reset.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage. |
| ⇒ | If less than the specified range, test the control circuit for a short to ground. |
| ⇒ | If greater than the specified value, test the control circuit for an open/high resistance. |
| ⇒ | If the DTC resets, replace the K33 HVAC Control Module. |
Repair Instructions
Perform the Diagnostic Repair Verification
