Pinpoint Test B: The Auxiliary Climate Control Illumination Is Inoperative: Testing

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-R, circuit 2086 (RD/LB), harness side and ground.
  
  Fig 1: Measuring Voltage Between Auxiliary Climate Control C990-R And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to B2.
- No : 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 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new auxiliary climate control. REFER to AUXILIARY CLIMATE CONTROL . TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.