Ford F-150 1999 Workshop Manual page 24

1999 F-150/250 Workshop Manual
E11 CHECK THE VOLTAGE TO THE A/C BLOWER MOTOR RELAY
E12 CHECK THE VOLTAGE TO THE FUNCTION SELECTOR SWITCH
Function Selector Switch C217
E13 CHECK CIRCUIT 181 (BR/O)
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Is the voltage 10 volts or greater?
Yes
GO to E11.
No
REPAIR Circuit 364 (BK/LG) for an open. TEST the system for normal operation.
Measure the voltage between A/C blower motor relay connector Pin 86, Circuit 181 (BR/O), and ground while
selecting each mode on the function selector switch.
Is the voltage 10 volts or greater in all positions except OFF?
Yes
GO to E14.
No
GO to E12.
Measure the voltage between function selector switch C217-2, Circuit 296 (W/P), and ground.
Is the voltage 10 volts or greater?
Yes
GO to E13.
No
REPAIR Circuit 296 (W/P) for an open. TEST the system for normal operation.
Page 24 of 30
8/16/2010