Toyota Tundra. Manual — part 2643
TESTER CONNECTION SPECIFIED CONDITION TABLE
f. Turn the ignition switch OFF.
g. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
h. Measure the resistance according the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION TABLE
NG: REPLACE FRONT SEAT WIRE RH
OK: Go to next step
5. CHECK FOR DTC
a. Connect the connectors to the occupant classification ECU and the 4 occupant detection sensors.
b. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
c. Turn the ignition switch ON, and wait for at least 60 seconds.
d. Clear any DTCs stored in the memory (see DTC CHECK/CLEAR ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the center airbag
sensor.
Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the
DTCs cannot be cleared.
e. Turn the ignition switch OFF.
f. Turn the ignition switch ON, and wait for at least 60 seconds.
Tester Connection
Switch Condition Specified Condition
Y1-11 (SVC1) - Body ground
Ignition switch ON
Below 1 ohms
Y1-12 (SVC2) - Body ground
Y1-5 (SVC3) - Body ground
Y1-6 (SVC4) - Body ground
Tester Connection
Condition Specified Condition
Y1-11 (SVC1) - Body ground
Always
1 Mohms or higher
Y1-12 (SVC2) - Body ground
Y1-5 (SVC3) - Body ground
Y1-6 (SVC4) - Body ground
Y1-11 (SVC1) - Y1-12 (SVC2)
Y1-12 (SVC2) - Y1-5 (SVC3)
Y1-12 (SVC2) - Y1-6 (SVC4)
Y1-11 (SVC1) - Y1-5 (SVC3)
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
g. Using the Techstream, check for DTCs of the occupant classification ECU (see DTC
CHECK/CLEAR ).
OK: DTC B1793 is not output.
HINT:
DTCs other than DTC B1793 may be output at this time, but they are not related to this check.
NG: Go to step 6
OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )
6. REPLACE OCCUPANT CLASSIFICATION ECU
a. Turn the ignition switch OFF.
b. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
c. Replace the occupant classification ECU.
for Manual Seat (see FRONT SEAT ASSEMBLY (FOR FOLD DOWN SEAT TYPE) )
for Power Seat (see FRONT SEAT ASSEMBLY (FOR POWER SEAT) )
HINT:
Perform the inspection using parts from a normal vehicle when possible.
7. PERFORM ZERO POINT CALIBRATION
a. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
b. Connect the Techstream to the DLC3.
c. Turn the ignition switch ON, and wait for at least 60 seconds.
d. Using the Techstream, perform the zero point calibration (see INITIALIZATION ).
8. PERFORM SENSITIVITY CHECK
a. Using the Techstream, perform the sensitivity check (see INITIALIZATION ).
Standard range:
27 to 33 kg (59.5 to 72.8 lb)
NEXT: END
DTC B1794: OPEN IN OCCUPANT CLASSIFICATION ECU BATTERY POSITIVE LINE
DESCRIPTION
DTC B1794 is set when a malfunction is detected in the occupant classification ECU.
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
DTC TROUBLE DETECTION CONDITION TABLE
HINT:
When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform
troubleshooting for DTC B1794 of the occupant classification system.
Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be
read.
WIRING DIAGRAM
Fig. 225: Identifying Open In Occupant Classification ECU Battery Positive Line - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
DTC
Code
DTC Detection Condition
Trouble Area
B1794
One of following conditions is met:
Occupant classification ECU circuit malfunction
Occupant classification ECU malfunction
Occupant classification ECU receives short circuit to ground
signal in passenger side buckle switch circuit for 2 seconds
Harness or
connector
Occupant
classification ECU
NOTE:
After the ignition switch is turned OFF, the navigation system requires
approximately 90 seconds to record various types of memory and settings. As a
result, after turning the ignition switch OFF, wait 90 seconds or more before
disconnecting the cable from the negative (-) battery terminal.
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
1. CHECK FOR DTC
a. Turn the ignition switch ON, and wait for at least 60 seconds.
b. Clear any DTCs stored in the memory (see DTC CHECK/CLEAR ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the center airbag
sensor.
Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the
DTCs cannot be cleared.
c. Turn the ignition switch OFF, and wait for at least 10 seconds.
d. Turn the ignition switch ON, and wait for at least 60 seconds.
e. Using the Techstream, check for DTCs of the occupant classification ECU (see DTC
CHECK/CLEAR ).
OK: DTC B1794 is not output.
HINT:
DTCs other than DTC B1794 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 DIAGNOSIS SYSTEM )
2. CHECK CONNECTION OF CONNECTOR
a. Turn the ignition switch OFF.
b. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
c. Check that the connectors are properly connected to the center airbag sensor, occupant detection
sensors and occupant classification ECU.
OK: Connectors are properly connected.
NG: CONNECT CONNECTOR
OK: Go to next step
3. CHECK CONNECTOR
a. Check that the connectors (on the occupant classification ECU side) are not damaged (see
ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
OK: Connectors are not deformed or damaged.
NG: REPLACE HARNESS OR CONNECTOR
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
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