Toyota Tundra. Manual — part 2574

Fig. 63: Identifying Instrument Panel Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE INSTRUMENT PANEL WIRE

OK: REPLACE ENGINE ROOM MAIN WIRE

19. CHECK INSTRUMENT PANEL WIRE

a. Disconnect the instrument panel wire connector from the engine room main wire.

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

c. Turn the ignition switch ON.

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

g. Using a service wire, connect terminal 30 (+SL) and 28 (-SL) of connector B.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection

Switch Condition Specified Condition

AJ8-1 (-SL) - Body ground

Ignition switch ON

Below 1 V

AJ8-2 (+SL) - Body ground

NOTE:

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

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

i. Disconnect the service wire from connector B.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 64: Identifying Instrument Panel Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE INSTRUMENT PANEL WIRE

OK: REPLACE ENGINE ROOM MAIN WIRE

DTC B1620/21, B1625/22: DRIVER SIDE - SIDE AIRBAG SENSOR CIRCUIT MALFUNCTION;
FRONT PASSENGER SIDE - SIDE AIRBAG SENSOR CIRCUIT MALFUNCTION

DESCRIPTION

The side airbag sensor LH and RH consists of the safing sensor, the diagnostic circuit, the lateral deceleration
sensor, etc.

If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether the SRS
should be activated.

DTC B1620/21 or B1625/22 is recorded when a malfunction is detected in the side airbag sensor LH or RH
circuit.

Tester connection

Condition Specified Condition

AJ8-1 (-SL) - AJ8-2 (+SL) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

AJ8-1 (-SL) - AJ8-2 (+SL)

Always

1 Mohms or higher

AJ8-1 (-SL) - Body ground

AJ8-2 (+SL) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

DTC TROUBLE DETECTION CONDITION TABLE

WIRING DIAGRAM

Fig. 65: Identifying Side Airbag Sensor Circuit Malfunction - Wiring Diagram (Driver Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC Code

Detection Condition

Trouble Area

B1620/21

When both conditions below are met:



Side airbag sensor LH malfunction



Center airbag sensor malfunction



Side airbag sensor LH



Center airbag sensor assembly

B1625/22

When both conditions below are met:



Side airbag sensor RH malfunction



Center airbag sensor malfunction



Side airbag sensor RH



Center airbag sensor assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 66: Identifying Side Airbag Sensor Circuit Malfunction - Wiring Diagram (Front Passenger Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FOR DTC

a. Turn the ignition switch OFF.

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

c. Clear the DTCs stored in the memory (see DTC CHECK/CLEAR ).

d. Turn the ignition switch OFF.

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

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