Toyota Tundra. Manual — part 2640

NG: Go to step 10

OK: Go to next step

5. CHECK FOR DTC

a. Connect the connectors to the occupant classification ECU and the center airbag sensor.

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 any 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.

g. Using the Techstream, check for DTCs of the occupant classification ECU (see DTC

CHECK/CLEAR ).

OK: DTC B1790 is not output.

HINT:

DTCs other than DTC B1790 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 (see FRONT POWER SEAT MOTOR 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.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

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)

9. CHECK FOR DTC

a. Connect the connector to the occupant classification ECU.

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.

g. Using the Techstream, check for DTCs of the occupant classification ECU (see DTC

CHECK/CLEAR ).

OK: DTC B1790 is not output.

HINT:

DTCs other than DTC B1790 may be output at this time, but they are not related to this check.

Result

RESULT TABLE

B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Column Shift Type) )

Result

Proceed to

DTC B1790 is not output

A

DTC B1790 is output (for Column Shift Type)

B

DTC B1790 is output (for Floor Shift Type)

C

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

C: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Floor Shift Type) )

A: END

10. CHECK FRONT SEAT WIRE RH

a. Disconnect the front seat wire RH connector from the No. 2 floor wire.

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. Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

e. Turn the ignition switch OFF.

f. Disconnect the connector from the occupant classification ECU.

g. Using a service wire, connect terminals 8 (FSR+) and 4 (FSR-) of connector E.

Tester Connection

Switch Condition Specified Condition

QY1-8 (FSR+) - Body ground

Ignition switch ON

Below 1 V

QY1-9 (FSR-) - Body ground

NOTE:

Do not forcibly insert the service wire into the terminals of connector.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 221: Identifying Front Seat Wire RH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

h. Measure the resistance according to the value(s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

i. Disconnect the service wire from connector E.

j. Measure the resistance according to the value(s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

NG: REPLACE FRONT SEAT WIRE RH

Tester Connection

Condition Specified Condition

QY1-8 (FSR+) - QY1-6 (FSR-) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

QY1-8 (FSR+) - QY1-6 (FSR-)

Always

1 Mohms or higher

QY1-8 (FSR+) - Body ground

QY1-9 (FSR-) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra