B10EB-12

B10EB-12-BLOWER MOTOR CONTROL - CIRCUIT SHORT TO BATTERY





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The A/C Heater Control constantly monitors the Blower Control circuit to the Blower Motor Power Module for proper operation. If the voltage or the Pulse Width Modulation (PWM) on that circuit drops below or rises above a predetermined value, a DTC will set. For further information .

- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater control detects the Blower Motor Control circuit Pulse Width Modulation (PWM) is less than 0% and or greater than 100% or PWM equals 0% for the period of 30 seconds.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. .

Diagnostic Test

1. CHECK IF DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTCs.

NOTE: It can take up to 30 seconds or more for this DTC to mature.

Is this DTC active?

Yes
- Go To 2

No
- Go To 4

2. CHECK THE (C56) BLOWER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the Blower Motor Power Module C1 harness connector.
3. Disconnect the A/C Heater Control C1 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C56) Blower Control circuit.

Is there and voltage present?

Yes
- Repair the (C56) Blower Control circuit for a short to voltage.
- Perform the HVAC VERIFICATION TEST. .

No
- Go To 3

3. CHECK THE BLOWER MOTOR POWER MODULE
1. Turn the ignition off to the lock position.
2. Replace the Blower Motor Power Module. .
3. Perform the HVAC VERIFICATION TEST. .

Did the DTC reset during or after the HVAC Verification Test?

Yes
- Replace and program the A/C Heater Control. Perform the HVAC VERIFICATION TEST. .

No
- Test complete.

4. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes
- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. .

No
- Test complete.