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:

A14-A15:

A16-A17:

A18-A20:

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 CH237 (VY/GY) (LH) or circuit CH211 (YE) (RH), depending on desired actuator rotation, by the electronic automatic temperature control (EATC) module. The EATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit CH239 (BU/WH) (LH) or circuit CH213 (BN/GN) (RH).

The driver side (LH) and passenger side (RH) temperature blend door actuator feedback resistors are supplied a ground from the EATC module by circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The EATC module reads the voltage on circuit VH440 (BU/BN) (LH) or circuit VH441 (WH/BN) (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 CH237 (VY/GY), CH239 (BU/WH), CH211 (YE), CH213 (BN/GN), RH111 (GY/BU), LH111 (BN/WH), VH440 (BU/BN) or VH441 (WH/BN)
- Driver side (LH) or passenger side (RH) temperature blend door actuator
- EATC module
- Stuck or bound linkage or door