Test F: Incorrect/Erratic Direction of Airflow From Outlet(s)

PINPOINT TEST F: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)

F1-F2:

F2-F3:

F3 Continued:

F3-F4:

F4-F5:

F5 Continued:

F5-F7:

F7-F9:

F9 Continued:

F9-F11:

F11-F12:

F12-F13:

F14:

Normal Operation
Under normal operation, to rotate the blend door actuator, the electronic manual temperature control (EMTC) or electronic automatic temperature control (EATC) module supplies voltage to the actuator motors through the door actuator clockwise circuits, and supplies ground through the door actuator counterclockwise circuits. To reverse the actuator rotation, the EMTC module or EATC module reverses the voltage and ground circuits.

The actuator feedback resistors are supplied a ground from the EMTC module or EATC module by the door actuator return circuits and a 5-volt reference voltage on the door actuator reference circuits. The EMTC module or EATC module reads the voltage on the blend door actuator feedback circuits to determine the door actuator position, by the position of the actuator feedback resistor wiper arm.

Door Actuator Clockwise Circuits
- (EMTC) Blend - CH233 (VT/BN)/(OG/BK)
- (EATC) LH Blend - CH238 (YE/OG)/(RD/YE)
- (EATC) RH Blend - CH213 (BN/GN)/(VT)
- Defrost/Panel/Floor - CH228 (YE/GN)/(GY/BK)

Door Actuator Counterclockwise Circuits
- (EMTC) Blend - CH234 (YE/GN)/(VT)
- (EATC) LH Blend - CH239 (BU/WH)/(WH)
- (EATC) RH Blend - CH212 (BU/OG)/(OG/BK)
- Defrost/Panel/Floor - CH229 (WH/BU)/(BU)

Door Actuator Return Circuits
- (EMTC) Blend - RH111 (GY/BU)/(BK)
- (EATC) LH Blend - RH111 (GY/BU)/(BK)
- (EATC) RH Blend - RH111 (GY/BU)/(BK)
- Defrost/Panel/Floor - RH111 (GY/BU)/(BK)

Door Actuator Reference Circuits
- (EMTC) Blend - LH111 (BN/WH)/(OG)
- (EATC) LH Blend - LH111 (BN/WH)/(OG)
- (EATC) RH Blend - LH111 (BN/WH)/(OG)
- Defrost/Panel/Floor - LH111 (BN/WH)/(OG)

Door Actuator Feedback Circuits
- (EMTC) Blend - VH439 (GY/VT)/(RD)
- (EATC) LH Blend - VH440 (BU/BN)/(YE)
- (EATC) RH Blend - VH441 (WH/BN)/(RD)
- Defrost/Panel/Floor - VH436 (YE/VT)/(BU/RD)

Possible Causes
- An open, short to voltage, ground or together in circuits CH212 (BU/OG)/(OG/BK), CH213 (BN/GN)/(VT), CH238 (YE/OG)/(RD/YE), CH239 (BU/WH)/(WH), CH228 (YE/GY)/(GY/BK), CH229 (WH/BU)/(BU), RH111 (GY/BU)/(BK), LH111 (BN/WH)/(OG), VH440 (BU/BN)/(YE), VH441 (WH/BN)/(RD) and VH436 (YE/VT)/(BU/RD)
- Defrost/panel/floor mode door actuator
- LH blend door actuator
- RH blend door actuator
- EATC module
- EMTC module
- Stuck or bound linkage or door