Toyota Tundra. Manual — part 2633

Fig. 214: Identifying Front Seat Wire RH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

i. Disconnect the service wires from connector C.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection

Condition Specified Condition

Y1-6 (SVC4) - Y1-4 (SGD4)

Always

Below 1 ohms

Y1-10 (SIG4) - Y1-4 (SGD4)

Tester Connection

Condition Specified Condition

Y1-6 (SVC4) - Y1-4 (SGD4)

Always

1 Mohms or higher

Y1-10 (SIG4) - Y1-4 (SGD4)

Y1-6 (SVC4) - Y1-10 (SIG4)

Y1-4 (SGD4) - Body ground
Y1-6 (SVC4) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

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 rear occupant detection sensor

RH.

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 B1783 is not output.

HINT:

DTCs other than DTC B1783 may be output at this time, but they are not related to this check.

NG: Go to step 66

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.

Y1-10 (SIG4) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

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 ).

NG: Go to step 10

OK: Go to next step

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)

NG: Go to step 10

OK: Go to next step

9. 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.

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 B1783 is not output.

HINT:

DTCs other than DTC B1783 may be output at this time, but they are not related to this check.

NG: Go to step 10

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

OK: END

10. REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH

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 front seat frame with adjuster RH (see FRONT POWER SEAT MOTOR

ASSEMBLY (FOR POWER SEAT) ).

HINT:

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

11. 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 ).

12. 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 B1785: FRONT OCCUPANT CLASSIFICATION SENSOR LH COLLISION DETECTION

DESCRIPTION

DTC B1785 is set when the occupant classification ECU receives a collision detection signal, which is sent by
the front occupant detection sensor LH when an accident occurs.

DTC B1785 is also set when the front seat frame with adjuster RH is subjected to a strong impact, even if an
actual accident has not occurred.

However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in
a collision, DTC B1785 can be cleared by conducting the zero point calibration and sensitivity check.

Therefore, if DTC B1785 is set, first perform the zero point calibration and sensitivity check.

DTC TROUBLE DETECTION CONDITION TABLE

DTC

Code

DTC Detection Condition

Trouble Area

Either of following conditions is met:

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra