Pinpoint Test V: The Panel/Floor Control Is Inoperative Using The Front Auxiliary Climate Controls

WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

V1 CHECK THE FLOOR MODE OUTPUT
- Disconnect: Air Distribution Door Actuator C3044.
- Key in ON position.
- Vehicles with manual climate control, place the function selector switch in FLOOR.
- Place the front auxiliary blower motor switch in HI and set the front auxiliary climate control assembly to FLOOR.
- Measure the voltage between the air distribution door actuator C3044-8, circuit 1131 (LG) and C3044-7, circuit 1137 (YE/LG).
  
  Fig 1: Checking Floor Mode Output
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to V2.
- No : GO to V3.
V2 CHECK THE PANEL MODE OUTPUT
- Set the front auxiliary climate control assembly to PANEL.
- Measure the voltage between the air distribution door actuator C3044-7, circuit 1137 (YE/LG) and C3044-8, circuit 1131 (LG).
  
  Fig 2: Checking Panel Mode Output
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new air distribution door actuator. TEST the system for normal operation.
- No : GO to V3.
V3 CHECK THE AIR DISTRIBUTION DOOR CIRCUITS
- Key in OFF position.
- Disconnect: Front Auxiliary Climate Control Assembly C989b.
- Measure the resistance between the front auxiliary climate control assembly C989b-2, circuit 1131 (LG) and the air distribution door actuator C3044-7, circuit 1131 (LG) and between the front auxiliary climate control assembly C989b-4, circuit 1137 (YE/LG) and the air distribution door actuator C3044-8, circuit 1137 (YE/LG).
  
  Fig 3: Checking Air Distribution Door Circuits
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to V4.
- No : REPAIR the affected circuit. TEST the system for normal operation.
V4 CHECK CIRCUIT 1131 (LG) AND CIRCUIT 1137 (YE/LG) FOR A SHORT TO GROUND
- Measure the resistance between ground and the front auxiliary climate control assembly:
  - C989b-2, circuit 1131 (LG).
  - C989b-4, circuit 1137 (YE/LG).
  Fig 4: Checking Circuit 1131 (LG) And Circuit 1137 (YE/LG) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to V5.
- No : REPAIR the affected circuit. TEST the system for normal operation.
V5 CHECK CIRCUIT 1131 (LG) AND CIRCUIT 1137 (YE/LG) FOR A SHORT TO VOLTAGE
- Key in ON position.
- Measure the voltage between ground and the front auxiliary climate control assembly:
  - C989b-2, circuit 1131 (LG).
  - C989b-4, circuit 1137 (YE/LG).
  Fig 5: Checking Circuit 1131 (LG) And Circuit 1137 (YE/LG) For Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is voltage present?
- Yes : GO to V6.
- No : REPAIR the affected circuit. TEST the system for normal operation.
V6 CHECK CIRCUIT 1137 (YE/LG) FOR A SHORT TO CIRCUIT 1131 (LG)
- Key in OFF position.
- Measure the resistance between the front auxiliary climate control assembly C989a-8, circuit 1137 (YE/LG) and C989a-7, circuit 1131 (LG).
  
  Fig 6: Checking Circuit 1137 (YE/LG) For Short To Circuit 1131 (LG)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new front auxiliary climate control assembly. TEST the system for normal operation.
- No : REPAIR the affected circuit. TEST the system for normal operation.