Test N: The Blower Motor Is Inoperative - EATC
PINPOINT TEST N: THE BLOWER MOTOR IS INOPERATIVE - 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 through circuit SBB35 (BU/RD). 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 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 relay
- Blower motor control module
- EATC module
- Blower motor
N1-N4:
N4-N6:
N7-N9:
N9-N12:
N12-N14:
