Ford F-150 1999 Workshop Manual page 21

1999 F-150/250 Workshop Manual
E2 CHECK CIRCUIT 181 (BR/O) FOR A SHORT TO GROUND
A/C Blower Motor Relay
Function Selector Switch C217
E3 CHECK FUSE 23 (40A)
Fuse 23 (40A)
E4 CHECK THE BLOWER MOTOR SUPPLY FOR A SHORT TO GROUND
A/C Blower Motor C190
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Yes
GO to E3.
No
GO to E2.
Measure the resistance between function selector switch C217-1, Circuit 181 (BR/O), and ground.
Is the resistance greater than 10,000 ohms?
Yes
REPAIR Circuit 296 (W/P) for a short. TEST the system for normal operation.
No
REPAIR Circuit 181 (BR/O) for a short. TEST the system for normal operation.
Is the fuse OK?
Yes
GO to E7.
No
GO to E4.
Measure the resistance between the A/C blower motor C190-2, Circuit 399 (BR/Y) and ground while selecting
each mode on the function selector switch.
Is the resistance greater than 10,000 ohms in all function selector switch positions except OFF?
Yes
REPLACE the A/C blower motor. TEST the system for normal operation.
No
GO to E5.
Page 21 of 30
8/16/2010