Component Location
General Description

The mode control actuator mounted on heater unit adjusts position of mode door by operating Direction Motor based on signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent→ B/L → floor → mix.

DTC Description

The ECM sets DTC B1250 if there is a short to power in the DR Direction actuator signal harness.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Voltage check

● Open circuit in harness

● Short circuit in harness

Threshold value

●＞4.9V

Detecting time

● 0.3sec

FAIL SAFE

● Setting mode : VENT

Fix at VENT position

● Setting mode : Except VENT

Fix at DEF position

Schematic Diagram
note
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Signal Waveform

※ Voltage value of Direction potentiometer as a function of position of mode switch.

Door position

Voltage

Error Detecting Condition

VENT

0.3±0.15V

Undervoltage : 0.10V or less

DEF

4.7±0.15V

Overvoltage : 4.92V or more

Яндекс.Метрика