Pinpoint Test D: B1086:07, B1086:11, B1086:12, B1086:13, B11E7:11, B11E7:15
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to Wiring Diagrams MANUAL CLIMATE CONTROL SYSTEM
for schematic and connector information.
Normal Operation and Fault Conditions
Air Handling, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the defrost vent door and the footwell vent/register door until the doors reach both internal stops in the HVAC case. If the defrost vent door or the footwell vent/register door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition HVAC B1086:07 Air Distribution Damper Motor: Mechanical Failures Module senses the air distribution door actuator motor control is awake, no actuator drive, stall before achieving target position within 15 seconds. HVAC B1086:11 Air Distribution Damper Motor: Circuit Short To Ground Module senses a short to ground on air distribution door actuator circuits when motor movement is commanded. HVAC B1086:12 Air Distribution Damper Motor: Circuit Short To Battery Module senses a short to voltage on air distribution door actuator circuits when motor movement is commanded. HVAC B1086:13 Air Distribution Damper Motor: Circuit Open Module senses an open on air distribution door actuator circuits when motor movement is commanded. HVAC B11E7:11 Air Distribution Damper Position Sensor: Circuit Short To Ground Module senses a short to ground on air distribution door actuator circuits when motor movement is commanded. HVAC B11E7:15 Air Distribution Damper Position Sensor: Circuit Short To Battery Or Open Module senses a short to voltage or an open on air distribution door actuator circuits when motor movement is commanded. Possible Sources
- Wiring, terminals or connectors
- Actuator doors binding, stuck or slipping
- Air distribution door actuator
- HVAC control module
- NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- D1 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect HVAC control module C228A and C228B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C228A-20 Ground C228A-2 Ground C228A-3 Ground C228A-22 Ground C228A-21 Ground
Is there any voltage present?
Yes REPAIR the circuit. No GO to D2 - D2 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C228A-20 Ground C228A-2 Ground C228A-3 Ground C228A-22 Ground C228A-21 Ground
Are the resistances greater than 10, 000 ohms?
Yes GO to D3 No REPAIR the circuit. - D3 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect Air distribution door actuator C236.
- Measure:
Positive Lead Measurement / Action Negative Lead C228A-20 C236-1 C228A-2 C236-2 C228A-3 C236-3 C228A-22 C236-4 C228A-21 C236-6
Are the resistances less than 3 ohms?
Yes GO to D4 No REPAIR the circuit. - D4 CHECK FOR CORRECT ACTUATOR OPERATION
- Ignition OFF.
- Disconnect and inspect the air distribution door actuator connector (if not previously disconnected).
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes INSTALL a new air distribution door actuator. REFER to: Air Distribution Door Actuator . CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. TEST the system for normal operation. If the concern is still present, GO to D5 No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. - D5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
- Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.