Ford Transit 2002 Owner's Manual page 1469

A8: CHECK THE CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH
A9: CHECK THE HEATER BLOWER SWITCH
Is a resistance of less than 2 Ohm registered?
Yes
INSTALL A NEW blower switch. CHECK the
operation of the system.
No
LOCATE and RECTIFY the break in circuit 31-FA25
(BK) between the blower switch and ground
connection G14 using the Wiring Diagrams. CHECK
the operation of the system.
Ignition switch in position 0.
1
Disconnect connector C469 of heater blower
2
switch.
Disconnect connector C789 from blower motor.
3
Measure the resistance between the blower motor,
4
connector C789, pin 2, circuit 31S-FA18 (BK/RD),
wiring harness side and the blower switch,
connector C469, pin 6, circuit 31S-FA33 (BK/OG),
wiring harness side.
Is a resistance of less than 2 Ohm registered?
Yes
INSTALL A NEW blower switch. CHECK the
operation of the system.
No
LOCATE and REPAIR the break in circuit 31S-FA33
(BK/OG) between the blower switch and soldered
connection S24 using the Wiring Diagrams. CHECK
the operation of the system.
Ignition switch in position 0.
1
Disconnect connector C469 of heater blower
2
switch.
Ignition switch in position II.
3
Measure the voltage between the blower switch,
4
connector C469, pin 5, circuit 31S-FA32 (BK/BU),
wiring harness side and ground.
Measure the voltage between the blower switch,
5
connector C469, pin 3, circuit 31S-FA31 (BK/YE),
wiring harness side and ground.
Measure the voltage between the blower switch,
6
connector C469, pin 1, circuit 31S-FA30 (BK/WH),
wiring harness side and ground.
Is battery voltage measured in all cases?
Yes
INSTALL A NEW blower switch. CHECK the
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