Cruze |
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• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Blower Motor Control Module B+ | B0193 06 | B0193 06 | -- | -- |
Blower Motor B+ | 1 | 1 | -- | -- |
Blower Motor Control Module Control | B0193 06 | B0193 06 | B0193 01 | -- |
Blower Motor Control | 2 | 1 | 1 | -- |
Blower Motor Control Module Ground | -- | B0193 06 | -- | -- |
1. Blower Motor Inoperative 2. Blower Motor Always ON |
The blower motor control module is an interface between the HVAC control module and the blower motor. The blower motor speed control input 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, varying between 2-13 V, linear to the frequency of the PWM signal.
Check the following mechanical fault sources:
• | Air distribution box |
• | Air distribution hoses/air distribution ducts |
Manual HVAC Description and Operation
Control Module References for scan tool information
If the M8 Blower Motor is ON
Refer to Circuit/System Testing below.
If the M8 Blower Motor is OFF
If the M8 Blower Motor does not operate and changes speed as selected
Refer to Circuit/System Testing below.
If the M8 Blower Motor does operate and changes speed as selected
If the scan tool reading does not reflect the selected speed
Replace the A26 HVAC Controls.
If the scan tool reading matches the selected speed
Note: It may take up to 2 minutes for all vehicle systems to power down.
If 1 V or greater
Repair the short to voltage in the circuit.
If less than 1 V
If 5 Ω or greater
4.1. | Ignition OFF. |
4.2. | 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 5 Ω
If the test lamp does not illuminate and the circuit fuse is good
5.1. | Ignition OFF. |
5.2. | 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
5.1. | Ignition OFF. |
5.2. | Test for infinite resistance between the B+ circuit connector terminal 6 X1 and ground. |
If less than infinite resistance, repair the short to ground in the circuit.
If infinite resistance
5.3. | Disconnect the harness connector at the M8 Blower Motor. |
5.4. | Test for infinite resistance between the B+ circuit connector terminal A and ground. |
If less than infinite resistance, repair the short to ground in the circuit.
If infinite resistance, replace K8 Blower Motor Control Module.
If the test lamp does illuminate
Note: If test step 7 and 8 are to be repeated for any reason, the ignition must be turned OFF for at least 2 minutes before repeating test.
[ARW-LISTFAIL]If the test lamp is always OFF
8.1. | Ignition OFF. Disconnect the harness connector X2 at the K8 Blower Motor Control Module. |
8.2. | Ignition ON Test for less than 1 V between the control circuit terminal B and ground. |
If 1 V or greater
Repair the short to voltage in the circuit.
If less than 1 V
8.3. | Ignition OFF. |
8.4. | Test for infinite resistance between the control circuit terminal B and ground. |
If less than infinite resistance, repair the short to ground in the circuit.
If infinite resistance
8.5. | Test for less than 2 Ω in the control circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K8 Blower Motor Control Module.
If the test lamp is always ON
If less than infinite resistance, repair the short to ground in the circuit.
If infinite resistance, replace the K8 Blower Motor Control Module.
If the test lamp does illuminate increasingly
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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