Test R: The Auxiliary Blower Motor Is Inoperative

PINPOINT TEST R: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE

R1:

R1-R2:

R3-R5:

R6-R7:

R7-R8:

Normal Operation
Under normal operation, the auxiliary blower motor relay 1 coil receives ignition voltage through circuit CBP46 (WH/BU). The coil receives ground from the electronic automatic temperature control (EATC) module or electronic manual temperature control (EMTC) module through circuit CH112 (VT/WH) if any auxiliary blower speed but OFF is selected. Voltage is supplied to the relay switch contact through circuit SBB11 (BU/RD). When the relay coil is energized, voltage is delivered to the blower motor through circuit CHA05 (BN/WH). Ground for the blower motor is provided through circuit CHA06 (YE/VT) from the blower motor resistor. The blower resistor is grounded through circuit GD151 (BK/GN).

Possible Causes
- Fuse(s)
- An open in circuit SBB11 (BU/RD), CH112 (VT/WH), GD151 (BK/GN), CHA05 (BN/WH), CHA06 (YE/VT) or CBP46 (WH/BU).
- Auxiliary blower motor
- Auxiliary blower motor relay 1
- Auxiliary blower motor resistor
- EATC module
- EMTC module