Test N: The Blower Motor Is Inoperative - DATC
PINPOINT TEST N: THE BLOWER MOTOR IS INOPERATIVE - 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). When the relay coil is energized, voltage is delivered to the blower motor control module 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:
- Fuse(s)
- Wiring, terminals or connectors
- Blower motor relay
- Blower motor speed control
- HVAC module - DATC
- Blower motor
N1-N3:
N3-N5:
N5 Continued:
N6-N7:
N7-N8:
N8-N9:
N10-N12:
N12-N13:
