System Diagram
System Description
Fan speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload and air mix door position.
By pressing the AUTO switch, the blower motor starts to gradually increase airflow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flowing.
SYSTEM OPERATION
System Operation
Normal Automatic Airflow Control
Fan Speed Control Specification
Starting Airflow Control
Starting Fan Speed Control
Start-up from COLD SOAK Condition (Automatic mode) In cold start-up condition where the engine coolant temperature is below 56C (133F), the blower does not operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the ambient temperature and engine coolant temperature.
In the most extreme case (very low ambient temperature) the blower start delay is 150 seconds, as described above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above 56C (133F), and then the fan speed increases to the objective speed.
Start-up from usual or HOT SOAK Condition (Automatic mode) The blower will begin operation momentarily after the AUTO switch is pressed. The fan speed rises gradually to the objective speed over a time period of 3 seconds or less (actual time depends on the objective fan speed).
B2602 shift position
Description
BCM confirms the shift position with the following 2
signals.
CVT selector lever
Speed signal from meter
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC B2602 is displayed with DTC
U1000, first perform the trouble diagnosis for DTC U1000. Refer ...
Door switch
Description
Detects door open/close condition.
Component Function Check
1.CHECK FUNCTION
With CONSULT
Check door switches DOOR SW-DR, DOOR SW-AS in Data Monitor mode with CONSULT.
Diagnosis Procedure
1.CHECK DOOR SWITCH INPUT SIGNAL
Turn ignition switch OFF.
Check signal between BCM c ...
U1218 AV control unit
DTC Logic
U1219 AV CONTROL UNIT
DTC Logic
U121A AV CONTROL UNIT
DTC Logic
U121B AV CONTROL UNIT
DTC Logic
U121C AV CONTROL UNIT
DTC Logic
...