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

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 (VT/GY) (LH) or circuit CH211 (YE) (RH), depending on desired actuator rotation, by the HVAC module - electronic automatic temperature control (EATC). The HVAC module - EATC 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 HVAC module - EATC by circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module - EATC 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.

- DTC B2266 Left Side Blend Door Circuit Failure - The module senses no voltage drop on the sensor reference voltage circuit, indicating an open circuit.
- DTC B2267 Right Side Blend Door Circuit Failure - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Driver side (LH) or passenger side (RH) temperature blend door actuator
- HVAC module - EATC
- Stuck or bound linkage or door

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A7 Continued:

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A12 Continued:

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