Pinpoint Test B: The Auxiliary Climate Control Illumination Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK CIRCUIT 2086 (RD/LB) FOR AN OPEN
- Key in OFF position.
- Disconnect: Auxiliary Climate Control C990.
- Key in ON position.
- Measure the voltage between the auxiliary climate control C990-6, circuit 2086 (RD/LB), harness side and ground.
  
  Fig 1: Measuring Voltage Between Auxiliary Climate Control C990-6, Circuit 2086 (RD/LB), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to B2.

No: VERIFY the smart junction box (SJB) fuse 15 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
B2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the auxiliary climate control C990-5, circuit 1205 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between Auxiliary Climate Control C990-5, Circuit 1205 (BK), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: INSTALL a new auxiliary climate control. TEST the system for normal operation.

No: REPAIR the circuit. TEST the system for normal operation.