Toyota Tundra. Manual — part 2645

Perform the inspection using parts from a normal vehicle when possible.

3. 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 ).

4. 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 B1796: SLEEP OPERATION FAILURE OF OCCUPANT CLASSIFICATION ECU

DESCRIPTION

During sleep mode, the occupant classification ECU monitors 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
set.

DTC TROUBLE DETECTION CONDITION TABLE

HINT:



When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform
troubleshooting for DTC B1796 of the occupant classification system.



Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be
read.

INSPECTION PROCEDURE

1. CHECK FOR DTC

a. Turn the ignition switch ON, and wait for at least 60 seconds.

DTC Code

DTC Detection Condition

Trouble Area

B1796

Occupant classification ECU malfunction

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

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 B1796 is not output.

HINT:

DTCs other than DTC 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 DIAGNOSIS SYSTEM )

2. 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.

3. 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 ).

4. PERFORM SENSITIVITY CHECK

a. Using the Techstream, perform the sensitivity check (see INITIALIZATION ).

Standard range:

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

27 to 33 kg (59.5 to 72.8 lb)

NEXT: END

TROUBLE IN PASSENGER AIRBAG ON/OFF INDICATOR

DESCRIPTION

The passenger airbag ON/OFF indicator consists of the center airbag sensor assembly, occupant classification
ECU, hazard warning switch assembly, and 4 occupant classification sensors. This system controls the
passenger airbag deployment according to the occupancy condition of the front passenger seat, and also displays
those detected conditions.

WIRING DIAGRAM

Fig. 227: Identifying Trouble In Passenger Airbag ON/OFF Indicator - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

INSPECTION PROCEDURE

1. CHECK VEHICLE TYPE

a. Proceed to the appropriate step according to the table below.

Result

RESULT TABLE

B: Go to step 13

A: Go to next step

2. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT

a. Turn the ignition switch OFF.

b. Loosen the 4 installation bolts of the front seat RH.

c. Tighten the 4 installation bolts of the front seat RH to the specified torque.



for Manual Seat (see INSTALLATION )



for Power Seat (see INSTALLATION )

Torque: 37 N*m (377 kgf*cm, 27 ft.*lbf)

3. PERFORM ZERO POINT CALIBRATION

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON, and wait for at least 60 seconds.

c. Using the Techstream, perform the zero point calibration (see INITIALIZATION ).

OK: Zero point calibration is completed using tester.

NG: Go to step 4

OK: END

4. READ VALUE USING TECHSTREAM (PASSENGER SIDE BUCKLE SWITCH)

a. Turn the ignition switch ON, and wait for at least 60 seconds.

b. Using the Techstream, read the "Data List" (see DTC CHECK/CLEAR ).

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.

Result

Proceed to

w/o Passenger airbag cut-off switch

A

w/ Passenger airbag cut-off switch

B

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra