Ford Transit 2002 Owner's Manual page 1470

A10: CHECK THE CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER
RESISTOR
A11: CHECK THE CIRCUIT BETWEEN THE BLOWER RESISTOR AND THE BLOWER
SWITCH
A12: CHECK THE CIRCUIT BETWEEN THE BLOWER RESISTOR AND THE BLOWER
SWITCH
operation of the system.
No
GO to A10.
Ignition switch in position 0.
1
Disconnect connector C470 from blower resistor
2
assembly.
Ignition switch in position II.
3
Measure the voltage between the blower resistor,
4
connector C470, pin 1, circuit 31S-FA1 (BK/BU),
wiring harness side and ground.
Does the meter display battery voltage?
Yes
GO to A11.
No
LOCATE and REPAIR the break in circuit 31S-FA1
(BK/BU) between soldered connection S24 and the
blower resistor assembly using the Wiring
Diagrams. CHECK the operation of the system.
Ignition switch in position 0.
1
Measure the resistance between the blower resistor
2
assembly, connector C470, pin 4, circuit 31S-FA32
(BK/BU), wiring harness side and the blower switch,
connector C469, pin 5, circuit 31S-FA32 (BK/BU),
wiring harness side.
Is a resistance of less than 2 Ohm registered?
Yes
GO to A12.
No
LOCATE and REPAIR the break in circuit 31S-FA32
(BK/BU) between the blower resistor assembly and
the blower switch using the Wiring Diagrams.
CHECK the operation of the system.
Measure the resistance between the blower resistor
1
assembly, connector C470, pin 2, circuit 31S-FA31
(BK/YE), wiring harness side and the blower switch,
connector C469, pin 3, circuit 31S-FA31 (BK/YE),
wiring harness side.
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