194002540 - 5040DF SEQUENTIAL PROCEDURE FOR CHECKING AIR CONDITIONING FAN OPERATION

Disconnect the electrical connector for the climate control fan    See H081 CLIMATE CONTROL FAN CONTROLPlace the fan speed knob at 0 and check that:

  • There is electrical continuity between pins 4 and 3.
  • There is an open circuit between pins 4 and 2.
  • There is an open circuit between pins 4 and 1.
Place the fan speed knob at 1 and check that:

  • There is electrical continuity between pins 4 and 3.
  • There is an open circuit between pins 4 and 2.
  • There is an open circuit between pins 4 and 1.
Place the fan speed knob at 2 and check that:

  • There is electrical continuity between pins 4 and 2.
  • There is an open circuit between pins 4 and 3.
  • There is an open circuit between pins 4 and 1.
Place the fan speed knob at 3 and check that:

  • There is electrical continuity between pins 4 and 1.
  • There is an open circuit between pins 4 and 3.
  • There is an open circuit between pins 4 and 2.
Place the fan speed knob at 4 and check that:

  • There is electrical continuity between pins 4 and 1.
  • There is an open circuit between pins 4 and 3.
  • There is an open circuit between pins 4 and 2.
Reconnect the electrical connector for the control.    See H081 CLIMATE CONTROL FAN CONTROLDisconnect the electrical connector for the climate control system control unit    See M70 CLIMATE CONTROL SYSTEM CONTROL UNITPlace the fan speed knob in position 1 and check that the voltage between pins 19 and 32 is between 9.6 and 14.4 V.Place the fan speed knob in position 4 and check that the voltage between pins 19 and 31 is between 9.6 and 14.4 V.