Toyota Tundra. Manual — part 2592

Fig. 121: Identifying Center Airbag Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Result

RESULT TABLE

HINT:

Codes other than DTC B1660 maybe output at this time, but they are not related to this check.

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: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )

DTC B1661/44: ROLL OVER CUT OFF INDICATOR MALFUNCTION

DESCRIPTION

The RSCA OFF switch is a mechanism that operates both right and left side of the curtain shield airbag and the
front seat outer belt when the center airbag sensor detects a roll-over.

The RSCA OFF indicator is installed in the combination meter.

If the RSCA OFF switch is operated, the indicator comes on to inform the driver that the roll-over detection
system is not working.

Result

Proceed to

DTC B1660 is output (for Column Shift
Type)

A

DTC B1660 is output (for Floor Shift Type)

B

DTC B1660 is not output

C

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

The initial setting of the roll-over detection system is on. It automatically operates every time the ignition
switch is turned ON.

DTC TROUBLE DETECTION CONDITION TABLE

WIRING DIAGRAM

Fig. 122: Identifying Roll Over Cut Off Indicator Malfunction - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

DTC

Code

DTC Detection Condition

Trouble Area

B1661/44



The center airbag sensor receives an open signal or short to
ground in the RSCA OFF indicator circuit.



RSCA OFF indicator malfunction



Center airbag sensor malfunction



Combination meter
assembly



Center airbag sensor
assembly



Instrument panel wire

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

1. CHECK COMBINATION METER (SOURCE VOLTAGE)

a. Turn the ignition switch OFF.

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

c. Remove the combination meter with connect connector.

d. Disconnect the connector from the center airbag sensor.

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

f. Turn the ignition switch ON.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 123: Identifying Combination Meter Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to METER/GAUGE SYSTEM

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.

Tester Connection

Switch Condition Specified Condition

J28-6 (SW) - Body ground Ignition switch ON

11 to 14 V

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

OK: Go to next step

2. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - COMBINATION

METER AND BODY GROUND)

a. Turn the ignition switch OFF.

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

c. Disconnect the connector from the center airbag sensor and combination meter.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

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

f. Turn the ignition switch ON.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection

Condition Specified Condition

J28-6 (SW) - J46-20 (RMIL) Always

Below 1 ohms

J28-6 (SW) - Body ground

Always

1 Mohms or higher

Tester Connection

Switch Condition Specified Condition

J28-6 (SW) - Body ground Ignition switch ON

Below 1 V

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra