Pinpoint Test C: The Climate Control Panel Illumination Is Inoperative

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

C1 CHECK FOR VOLTAGE ON CIRCUIT 19 (LB/RD)
- Key in OFF position.
- Disconnect: Climate Control Assembly C294c.
- Place the headlamp switch in the PARK position.
- Move the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the climate control assembly C294c-2, circuit 19 (LB/RD), harness side and ground.
  
  Fig 1: Checking For Voltage On Circuit 19 (LB/RD)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to C2.

No : REPAIR the circuit. TEST the system for normal operation.
C2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the climate control assembly C294c-1, circuit 57 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 57 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : INSTALL a new climate control assembly. REFER to CLIMATE CONTROL . TEST the system for normal operation.

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