Test O: The Blower Motor Does Not Operate Correctly - EATC
PINPOINT TEST O: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EATCNormal Operation
Under normal operation, the blower motor relay coil receives a ground from the electronic automatic temperature control (EATC) module through circuit CH123 (VT/GN). The coil receives ignition voltage through circuit CBP45 (YE). Voltage is supplied to the relay switch contact. When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit CH402 (YE/GN). Ground for the motor is provided through circuit VH301 (YE/BU) from the blower control module. Ground for the blower control module is provided by circuit GD111 (BK/BU). The EATC module sends a pulse width modulated (PWM) signal to the blower control module through circuit VH101 (WH/VT) to control the blower speed.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Blower motor control module
- EATC module
O1-O3:
O3-O5:
O5-O7:
