Test N: The Blower Motor Does Not Operate Correctly - Manual Climate Control
PINPOINT TEST N: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - MANUAL CLIMATE CONTROLNormal 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 CH446 (BU/BN)/VH301 (YE/BU). The resistor gets a ground from circuit GD140 (BK/GN) in the lowest blower setting. In MED-LO and MED-HI, the resistor gets a ground through circuit CH428 (GN/WH) or CH429 (GY/BN), depending on selected speed. The blower switch receives its ground from circuit GD138 (BK/WH).
The high speed blower motor relay coil receives voltage through circuit CH402 (YE/GN) from the blower motor relay. The coil receives ground from the function selector switch through circuit CH430 (VT/OG) when the highest blower speed is selected. Ground for high blower speed is provided to the high speed blower relay through circuit GD140 (BK/GN) when the relay is energized. The high speed blower motor relay provides the blower motor ground through circuit VH301 (YE/BU).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Blower motor resistor
- Blower motor switch
- High speed blower motor relay
N1-N2:
N2-N4:
N5-N7:
N7-N9:
