Test O
PINPOINT TEST O: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY- MANUAL CLIMATE CONTROLTest O1-O2:
Test O3-O5:
Test O5-O7:
Test O8-O10:
Test O11-O12:
Normal Operation
Under normal operation, when the high speed blower relay is not energized, the blower motor is provided a ground from the resistor through circuit 261 (OG/BK). The resistor gets a ground from circuit 1205 (BK) in the lowest blower setting. In MED-LO and MED-HI the resistor gets a ground through circuit 754 (LG/WH) or 752 (YE/RD) depending on selected speed. The blower switch receives its ground from circuit 1205 (BK).
The high speed blower motor relay coil receives voltage through circuit 371 (PK/WH) from the blower motor relay. The coil receives ground from the function selector switch through circuit 260 (RD/OG) when the highest blower speed is selected. Ground for high blower speed is provided to the high speed blower relay through circuit 1205 (BK) when the relay is energized. The high speed blower motor relay provides the blower motor ground through circuit 536 (BK/LG).
Possible Causes
- An open in circuit 1205 (BK), 260 (RD/OG), 371 (PK/WH), 754 (LG/WH) or 752 (YE/RD).
- A short to ground in circuit 260 (RD/OG), 261 (OG/BK), 754 (LG/WH) or 752 (YE/RD).
- A short together circuits 261(OG/BK), 754 (LG/WH) or 752 (YE/RD).
- Blower motor resistor.
- Blower motor switch.
- High speed blower motor relay.