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DTC B0208

DTC B0208

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 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


• Ignition ON.

• The HVAC control module is ON.


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


• 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


1. Ignition OFF, disconnect the X1 harness connector at the K8A Blower Motor Control Module.

2. Test for less than 5 Ω between the ground circuit X1 terminal 4 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the B+ circuit X1 terminal 2 and ground.

5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

6. Connect a DMM between the control circuit X1 terminal 1 and B+.

7. Cycle the blower motor from OFF to HIGH. The voltage should increase while changing between the commanded states.

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.

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.

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.

11. Ignition OFF, connect the X1 harness connector at the K8A Blower Motor Control Module and disconnect the harness connector at the M8A Blower Motor.

12. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal B and ground.

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.

14. Connect a test lamp between the B+ circuit terminal B and the control circuit terminal A.

15. 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.

16. 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.

17. If all circuits test normal, replace the M8A Blower Motor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• HVAC Component Replacement Reference

• Control Module References for HVAC control module replacement, setup, and programming