Test O: The Blower Motor Does Not Operate Correctly - DATC
PINPOINT TEST O: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - DATCNormal Operation
Under normal operation, the blower motor relay coil receives a ground from the HVAC module - dual automatic temperature control (DATC) through circuit CH123 (VT/GN). The coil receives ignition voltage through circuit CBP45 (YE). Voltage is supplied to the relay switch contact through circuit CH402 (YE/GN)/(BK). When the relay coil is energized, voltage is delivered to the blower motor speed control through circuit CH402 (YE/GN)/(BK). Ground for the blower motor speed control is provided by circuit GD116 (BK/VT)/(BK/RD). The HVAC module - DATC provides a blower target speed signal to the blower motor speed control through circuit VH101 (WH/VT)/(RD) to control the blower speed. The actual blower speed signal is provided to the HVAC module - DATC through circuit CH102 (YE/BU)/(BN) from the blower motor speed control. Ground for the motor is provided through circuit (BU) from the blower motor speed control.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Blower motor speed control
- Blower motor relay
- HVAC module - DATC
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