Ford F-150 1999 Workshop Manual page 19

1999 F-150/250 Workshop Manual
Fuse Junction Panel C242
D4 CHECK THE VOLTAGE TO THE A/C ELECTRONIC BLEND DOOR ACTUATOR MOTOR
A/C Electronic Blend Door Actuator Motor C229
D5 CHECK CIRCUITS 436 (R/LG), 437 (Y/LG) AND 438 (R/W)
Blend Door Actuator Control C220
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Measure the resistance between fuse junction panel C242-15, Circuit 295 (LB/PK), and ground.
Is the resistance greater than 10,000 ohms?
Yes
REPLACE the fuse junction panel. TEST the system for normal operation.
No
REPAIR Circuit 295 (LB/PK). TEST the system for normal operation.
Measure the voltage between the A/C electronic blend door actuator motor C229-7, Circuit 295 (LB/PK), and
ground.
Is the voltage greater than 10 volts?
Yes
GO to D5.
No
REPAIR Circuit 295 (LB/PK). TEST the system for normal operation.
Measure the resistance between the following pins:
Blend Door Actuator Control C220 A/C Electronic Blend Door Actuator Motor C229
Pin 3
Pin 2
Pin 1
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Circuit
Pin 4 436 (R/LG)
Pin 3 437 (Y/LG)
Pin 6 438 (R/W)
8/16/2010