Test S: The Auxiliary Blower Motor Does Not Operate Correctly
PINPOINT TEST S: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLYNormal Operation
Under normal operation, 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). The blower motor relay coils are supplied through circuit CBP46 (WH/BU). Blower motor speed is received by the HVAC module - dual automatic temperature control (DATC) or electronic manual temperature control (EMTC) module from the rear auxiliary control through circuit VHA17 (VT/GN). The blower speed selector resistor is provided reference voltage by the EMTC or HVAC module - DATC through circuit LH111 (BN/WH) and ground through circuit RH111 (GY/BU). The auxiliary blower motor relay 1 coil receives ground from the EMTC or HVAC module - DATC through circuit CH112 (VT/WH) if any blower speed but OFF is selected.
In LO, ground for the blower motor is provided through the blower motor resistor.
In MED-LO, blower motor relay 2 is grounded by the EMTC or HVAC module - DATC through circuit CH114 (GN/WH). Blower motor ground circuit CHA06 (YE/VT) is connected through one half of the blower motor resistor to circuit CHA08 (GN/OG). Circuit CHA08 (GN/OG) is connected through blower motor speed relay 2 to the blower motor resistor through circuit CHA07 (BU/GY). The blower resistor is grounded through circuit GD151 (BK/GN).
In MED-HI, blower motor relay 3 is grounded by the EMTC or HVAC module - DATC through circuit CH113 (VT/GY). Blower motor ground circuit CHA06 (YE/VT) is connected through blower motor relay 3 to circuit CHA08 (GN/OG). Circuit CHA08 (GN/OG) is connected through one half of the blower motor resistor to the blower motor resistor to ground circuit GD151 (BK/GN).
In HI, blower motor relays 2 and 3 are grounded by the EMTC or HVAC module - DATC through circuit CH114 (GN/WH) and CH113 (VT/GY). Blower motor ground circuit CHA06 (YE/VT) is connected through blower motor speed relay 3 to circuit CHA08 (GN/OG). Circuit CHA08 (GN/OG) is connected through blower motor relay 2 to the blower motor resistor ground circuit GD151 (BK/GN) by circuit CHA07 (BU/GY).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Auxiliary blower motor relay 1
- Auxiliary blower motor relay 3
- Auxiliary blower motor relay 2
- Auxiliary blower motor resistor
- HVAC module - DATC
- HVAC module - EMTC
S1-S2:
S2-S5:
S5-S8:
S8-S10:
S10 Continued:
S11-S12:
