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DI-768
                                            DIAGNOSTICS   -       AIR CONDITIONING SYSTEM
                                                                                                              DI8AF-01




 Blower Motor Circuit (Rear Heater)

CIRCUIT DESCRIPTION
This is the power source for blower motor.

WIRING DIAGRAM




                                        B19                                                 A/C control assembly
                         B12
                                        Blower Resistor Transistor
                         Blower Motor                                         18              15
                   L-R              L-W                         P-B                   Y-G
                                                 BLWR                         II2            A24 BLWH
                         1        2       4 B              2


         2   II4                                                              17              14
                                                                     P                  P
                                                                              II2            A24 VMH
                                                    BMC 3
         From Rear
         A/C Relay
             II4                                                  W-B
                                                    GND
                                                              1



                                                                         BO




                                                                                                                I21131




2001 SIENNA (RM787U)

                                                                          Author :          Date :              922
                                                                                                    DI-769
                                       DIAGNOSTICS   -   AIR CONDITIONING SYSTEM

INSPECTION PROCEDURE

  1     Check voltage between terminal RLWH of A/C control assembly connector and
        body ground.

                                             PREPARATION:
             ON              RLWH
                                             Remove the A/C control assembly with connector still con-
                                             nected.
                                             CHECK:
                                             (a) Turn ignition switch to ON.
                                             (b) Operate blower motor.
                                             (c) Measure voltage between terminal RLWH of A/C control
                       (+)   (-)                  assembly and body ground.
                                    I20998   OK:
                                                  Voltage: 1 

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