Test A: DTC B2266 or DTC B2267 - Blend Door Failure or Short

PINPOINT TEST A: DTC B2266 OR DTC B2267 - BLEND DOOR FAILURE OR SHORT

A1:

A1 Continued:

A2-A3:

A3-A5:

A5-A7:

A7-A8:

A8-A9:

A10-A11:

A11-A12:

A12-A13:

A13-A14:

A14-A15:

A16-A17:

A18-A19:

A20-A21:

A21-A22:

A22 Continued:

Normal Operation
Under normal operation, the driver side (LH) and passenger side (RH) temperature blend door actuator motors are supplied voltage or ground on circuit 291 (BK) (LH) or circuit 299 (DG) (RH), depending on desired actuator rotation, by the dual automatic temperature control (DATC) module. The DATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit 290 (GY) (LH) or circuit 300 (OG) (RH).

The driver side (LH) and passenger side (RH) temperature blend door actuator feedback resistors are supplied a ground from the DATC module by circuit 780 (DB) and a 5 volt reference voltage on circuit 292 (BN). The DATC module reads the voltage on circuit 114 (LB/YE) (LH) or circuit 115 (LG/BK) (RH) to determine the actuator position by the position of the actuator feedback resistor wiper arm.

Possible Causes
- An open, short to voltage, ground or together in circuits 291 (BK), 290 (GY), 299 (DG), 300 (OG), 780 (DB), 292 (BN), 114 (LB/YE) or 115 (LG/BK).
- Driver side (LH) or passenger side (RH) temperature blend door actuator.
- DATC module.
- Stuck or bound linkage or door.