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                                                                                                          DI-625
                                           DIAGNOSTICS   -   AIR CONDITIONING SYSTEM
                                                                                                           DI3WB-08




 Back Up Power Source Circuit

CIRCUIT DESCRIPTION
This is the back-up power source for the A/C control assembly. Power is supplied even when the ignition
switch is off and is used for DTC memory, etc..
WIRING DIAGRAM
                    Driver Side J/B                                                       A/C Amplifier

                2       ECU-B         4                                                13
                                                             L-R
               1K                     1B                                               A31 B


     W-R

                Engine Room R/B                Battery
                     J/B
              2               2            W
                   2      1




                                                                                                            I21903




2002 4RUNNER (RM887U)

                                                                   Author :            Date :              801
DI-626
                                    DIAGNOSTICS   -   AIR CONDITIONING SYSTEM

INSPECTION PROCEDURE

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

                                         PREPARATION:
                      (-)
                                         Remove A/C control assembly with connectors still connected
                                         (See page AC-84 ).
                                         CHECK:
             B+ (+)
                                         Measure voltage between terminal B+ of A/C control assembly
                                         connector and body ground.
                                         OK:
                                              Voltage : 10 - 14 V
                                I00352

                                           OK         Proceed to next circuit inspection shown on
                                                      problem symptoms table (See page DI-586 ).


  NG



   2     Check ECU-B fuse.

                                         PREPARATION:
 No. 1 J/B
                                         Remove ECU-B fuse from No. 1 J/B.
                                         CHECK:
                            ECU-B
                            Fuse         Check continuity of ECU-B fuse.
                                         OK:
                                             No continuity exists.




                                           NG         Check for short in all the harness and compo-
                                                      nents connected to the ECU-B fuse (See at-
                                                      tached wiring diagram).
                                I09233




  OK



  Check and repair harness and connector between A/C control assembly and battery.




2002 4RUNNER (RM887U)

                                                             Author :           Date :          802

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