Test F: Incorrect/Erratic Direction Of Airflow From Outlet(s)
PINPOINT TEST F: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)Normal Operation
Under normal operation, to rotate the blend door actuator, the HVAC module - electronic manual temperature control (EMTC) or HVAC module - dual automatic temperature control (DATC) 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 HVAC module - EMTC or HVAC module - DATC reverses the voltage and ground circuits.
The actuator feedback resistors are supplied a ground from the HVAC module - EMTC or HVAC module - DATC by the door actuator return circuits and a 5-volt reference voltage on the door actuator reference circuits. The HVAC module - EMTC or HVAC module - DATC 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
- (HVAC module - EMTC) Blend - CH233 (VT/BN)/(OG/BK)
- (HVAC module - DATC) LH Blend - CH238 (YE/OG)/(RD/YE)
- (HVAC module - DATC) RH Blend - CH213 (BN/GN)/(VT)
- Defrost/Panel/Floor - CH228 (YE/GN)/(GY/BK)
Door Actuator Counterclockwise Circuits
- (HVAC module - EMTC) Blend - CH234 (YE/GN)/(VT)
- (HVAC module - DATC) LH Blend - CH239 (BU/WH)/(WH)
- (HVAC module - DATC) RH Blend - CH212 (BU/OG)/(OG/BK)
- Defrost/Panel/Floor - CH229 (WH/BU)/(BU)
Door Actuator Return Circuits
- (HVAC module - EMTC) Blend - RH111 (GY/BU)/(BK)
- (HVAC module - DATC) LH Blend - RH111 (GY/BU)/(BK)
- (HVAC module - DATC) RH Blend - RH111 (GY/BU)/(BK)
- Defrost/Panel/Floor - RH111 (GY/BU)/(BK)
Door Actuator Reference Circuits
- (HVAC module - EMTC) Blend - LH111 (BN/WH)/(OG)
- (HVAC module - DATC) LH Blend - LH111 (BN/WH)/(OG)
- (HVAC module - DATC) RH Blend - LH111 (BN/WH)/(OG)
- Defrost/Panel/Floor - LH111 (BN/WH)/(OG)
Door Actuator Feedback Circuits
- (HVAC module - EMTC) Blend - VH439 (GY/VT)/(RD)
- (HVAC module - DATC) LH Blend - VH440 (BU/BN)/(YE)
- (HVAC module - DATC) RH Blend - VH441 (WH/BN)/(RD)
- Defrost/Panel/Floor - VH436 (YE/VT)/(BU/RD)
B226C-B295F:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Defrost/panel/floor mode door actuator
- LH blend door actuator
- RH blend door actuator
- HVAC module - DATC
- HVAC module - EMTC
- Stuck or bound linkage or door
F1-F2:
F2 Continued:
F2-F3:
F3-F4:
F4 Continued:
F4-F5:
F5 Continued:
F5 Continued:
F6-F7:
F7-F8:
F8-F9:
F9 Continued:
F9-F10:
F10-F11:
F12-F13:
