Toyota Tundra. Manual — part 2588

Codes other than DTC B1653 maybe output at this time. but they are not related to this check.

Fig. 107: Identifying Center Airbag Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

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

C: END (SEAT INNER BELT ASSEMBLY LH IS DEFECTIVE)

DTC B1655/37: DRIVER SIDE SEAT BELT BUCKLE SWITCH CIRCUIT MALFUNCTION

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor and the front seat inner belt LH. DTC
B1655/37 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.

DTC TROUBLE DETECTION CONDITION TABLE

WIRING DIAGRAM

DTC

Code

Detection Condition

Trouble Area

B1655/37

When all conditions below are met:



The center airbag sensor receives a line short circuit
signal, an open circuit signal, a short circuit to ground
signal or a short circuit to B+ signal in the seat belt buckle
switch LH circuit for 2 seconds.



Front seat inner belt LH malfunction



Center airbag sensor malfunction



Floor wire



Front seat inner belt
assembly LH (Seat
belt buckle switch LH)



Center airbag sensor
assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 108: Identifying Driver Side Seat Belt Buckle Switch Circuit Malfunction - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FOR DTC

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

b. Clear the DTCs (see DTC CHECK/CLEAR ).

c. Turn the ignition switch OFF.

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

e. Check for DTCs (see DTC CHECK/CLEAR ).

OK: DTC B1655 is not output.

HINT:

NOTE:



When disconnecting the cable from the negative (-) battery terminal while
performing repairs, some systems need to be initialized after the cable is
reconnected (see INITIALIZATION ).



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

Codes other than DTC B1655 maybe output at this time, but they are not related to this check.

Fig. 109: Identifying Center Airbag Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 2

OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )

2. CHECK CONNECTION OF CONNECTORS

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 and front seat inner

belt LH.

OK: The connectors are properly connected.

NG: CONNECT CONNECTORS PROPERLY

OK: Go to next step

3. CHECK CONNECTORS

a. Disconnect the connectors from the center airbag sensor and the front seat inner belt LH.

b. Check that the connectors (on the center airbag sensor side and front seat inner belt LH side) are

not damaged.

OK: The connectors are not deformed or damaged.

NG: REPLACE FLOOR WIRE

OK: Go to next step

4. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH)

a. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

b. Turn the ignition switch ON.

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

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

d. Turn the ignition switch OFF.

e. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

f. Using a service wire, connect terminals 11 (DBE+) and 12 (DBE-) of connector B.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

h. Disconnect the service wire from connector B.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 110: Identifying Floor Wire (Center Airbag Sensor - Front Seat Inner Belt LH)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Switch Condition Specified Condition

P7-1 (LBE+) - Body ground

Ignition switch ON

Below 1 V

P7-3 (LBE-) - Body ground

Tester Connection

Condition Specified Condition

P7-1 (LBE+) - P7-3 (LBE-) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

P7-1 (LBE+) - P7-3 (LBE-)

Always

1 Mohms or higher

P7-1 (LBE+) - Body ground

P7-3 (LBE-) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra