Pinpoint Test P: No Operation In High Blower Setting - Manual Climate Control

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

P1 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN CIRCUIT
- Key in OFF position.
- Disconnect: Blower Motor Switch C294c.
- Key in ON position.
- Turn the function selector switch to the FLOOR position.
- Measure the voltage between blower motor switch connector C294c, circuit 261 (OG/BK) and ground.
  
  Fig 1: Checking Circuit 261 (OG/BK) For Open Circuit
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new blower motor switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
- No : REPAIR circuit 261 (OG/BK) for an open circuit. TEST the system for normal operation.