Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2003 >> Explorer AWD V6-4.0L VIN E >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Pinpoint Tests >> Test R
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Test R

PINPOINT TEST R: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE


Test R1-R2:






Test R3-R4:






Test R5-R7:






Test R7-R8:






Normal Operation
Under normal operation, the auxiliary blower motor relay coil receives a ground through circuit 1205 (BK). The coil receives voltage from circuit 575 (YE/BK) when the ignition switch is ON. Voltage is supplied to the relay contacts from circuit 181 (BN/OG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 371 (PK/WH). Ground for the motor is provided through circuit 515 (OG/RD) from the resistor and switches. Ground for the resistor and switches are provided by circuit 1205 (BK).

Possible Causes
- An open in circuit 1205 (BK), 575 (YE/BK), 181 (BN/OG), 371 (PK/WH) or circuit 515 (OG/RD).
- Auxiliary blower motor.
- Auxiliary blower motor relay.
- Front auxiliary climate control assembly.
- Rear auxiliary climate control assembly.
pro multis · About Operation CHARM