PRE-RELEASE
DTC B0208
| DTC B0208 |
| 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 Descriptor |
DTC B0208 01
Rear Blower Motor Speed Circuit Short to Battery
DTC B0208 06
Rear Blower Motor Speed Circuit Low Voltage/Open
| Circuit/System Description |
The blower motor control module - auxiliary 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 - auxiliary to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the blower motor control module - extra in order to command the blower motor speed. The blower motor control module - auxiliary 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 |
B0208 01
The voltage at the HVAC control module output to the blower motor control module - auxiliary is always high.B0208 06
The voltage at the HVAC control module output to the blower motor control module - auxiliary 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 X1 harness connector at the K8A Blower Motor Control Module.
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| 2. |
Test for less than 5 Ω between the ground circuit X1 terminal 4 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit X1 terminal 2 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. |
Connect a DMM between the control circuit X1 terminal 1 and B+.
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| 7. |
Cycle the blower motor from OFF to HIGH. The voltage should increase while changing between the commanded states.
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| 8. |
If voltage remains greater than 11.5 V while changing between the commanded states, test the control circuit for a short to voltage. If the circuit test normal, replace the K33 HVAC Control Module.
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| 9. |
If voltage remains less than 1.0 V while changing between the commanded states, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
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| 10. |
If voltage is between 1.0-11.5 V and does not increase when changing between the commanded states, replace the K33 HVAC Control Module.
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Ignition OFF, connect the X1 harness connector at the K8A Blower Motor Control Module and disconnect the harness connector at the M8A Blower Motor.
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| 12. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal B and ground.
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| 13. |
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K8A Blower Motor Control Module.
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Connect a test lamp between the B+ circuit terminal B and the control circuit terminal A.
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Turn the blower motor on high speed then to low speed. The test lamp intensity should be bright when in high speed and very dim or off when the blower is on low speed.
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If the test lamp intensity does not vary, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K8A Blower Motor Control Module.
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| 17. |
If all circuits test normal, replace the M8A Blower Motor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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HVAC Component Replacement Reference
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Control Module References
for HVAC control module replacement, setup, and programming
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