Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b1796

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                                                                                                               05-1099
                                              DIAGNOSTICS       -   SUPPLEMENTAL RESTRAINT SYSTEM                05IX1-03




    DTC             B1796               SLEEP OPERATION FAILURE OF
                                        OCCUPANT CLASSIFICATION ECU

CIRCUIT DESCRIPTION
During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition
switch is off. In this mode, if the occupant classification ECU detects an internal malfunction, DTC B1796
is output.
    DTC No.                    DTC Detecting Condition                                          Trouble Area
       B1796   S Occupant classification ECU malfunction                 S Occupant classification ECU
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, per-
form troubleshooting for the DTC B1796 of the occupant classification system.
INSPECTION PROCEDURE
   1       CHECK DTC

(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(c) Turn the ignition switch to the LOCK position, and wait for at least 10 seconds.
(d) Turn the ignition switch to the ON position.
(e) Using the hand-held tester, check the DTCs (see page 05-777 ).
       OK:
       DTC B1796 is not output.
HINT:
Codes other than code B1796 may be output at this time, but they are not related to this check.
                                                           NG       Go to step 2

   OK

  USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )




2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                          Author :                   Date :      1282
05-1 100
                                           DIAGNOSTICS   -   SUPPLEMENTAL RESTRAINT SYSTEM

      2      REPLACE OCCUPANT CLASSIFICATION ECU

(a)       Turn the ignition switch to the LOCK position.
(b)       Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c)       Replace the occupant classification ECU (see page 60-67 ).
 NEXT

      3      PERFORM ZERO POINT CALIBRATION

(a)       Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
          OK:
          The "COMPLETED" is displayed.
 NEXT

      4      PERFORM SENSITIVITY CHECK

(a)       Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
          Standard value: 27 to 33 kg (59.52 to 72.75 lb)
 NEXT

  END




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                   Author :             Date :             1283

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