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Test D: Incorrect/Erratic Direction Of Airflow From Outlet(s)
PINPOINT TEST D: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)Normal Operation
Under normal operation, to rotate the mode door actuator clockwise, the HVAC module - electronic manual temperature control (EMTC) or HVAC module - electronic automatic temperature control (EATC) supplies voltage to the blend and defrost/panel/floor mode door actuator motors through the door actuator feed B circuits, and supplies ground through the door actuator feed A circuits. To rotate the mode door actuator counterclockwise, the HVAC module - EMTC or HVAC module - EATC reverses the voltage and ground circuits.
The mode door actuator feedback resistors are supplied a ground from the HVAC module - EMTC or HVAC module - EATC by the mode door actuator return circuits and a 5-volt reference voltage on the mode door actuator reference circuits. The HVAC module - EMTC or HVAC module - EATC reads the voltage on the mode door actuator feedback circuits to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.
Door actuator feed B circuits
- Blend - 250 (OG)
- Defrost/panel/floor - 1993 (BN/YE)
Door actuator feed A circuits
- Blend - 249 (DB/LG)
- Defrost/panel/floor - 1992 (YE/LB)
Door actuator return circuits
- Blend - 247 (WH/YE)
- Defrost/panel/floor - 247 (WH/YE)
Door actuator reference circuits
- Blend - 243 (LG/OG)
- Defrost/panel/floor - 243 (LG/OG)
Door actuator feedback circuits
- Blend - 246 (VT)
- Defrost/panel/floor - 1989 (OG/LB)
- DTC B1263 Servo Motor Vent Circuit Failure -The module senses an open or short in any of the motor circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Blend, air inlet or defrost/panel/floor mode door actuator motor
- HVAC module - EATC
- HVAC module - EMTC
- Stuck or bound linkage or door
D1-D2:
D3-D5:
D5-D7:
D7-D9:
D9-D11:
D11-D12:
D13:
D14-D15:
D15 Continued:
D16-D17:
D17-D18:
