Toyota Tundra. Manual — part 2593
Fig. 124: Identifying Center Airbag Sensor & Combination Meter Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE INSTRUMENT PANEL WIRE
OK: Go to next step
3. INSPECT RSCA OFF SWITCH
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 RSCA OFF switch.
d. 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
4 (SW) - 1 (E)
RSCA OFF switch is in on position
Below 1 ohms
4 (SW) - 1 (E)
RSCA OFF switch is in off position 1 Mohms or higher
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
Fig. 125: Identifying RSCA OFF Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RSCA OFF SWITCH
OK: Go to next step
4. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - RSCA OFF SWITCH
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 RSCA OFF switch.
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
J46-19 (RMSW) - J38-4 (SW) Always
Below 1 ohms
J38-4 (SW) - Body ground
Always
1 Mohms or higher
J38-1 (E) - Body ground
Always
Below 1 ohms
Tester Connection
Switch Condition Specified Condition
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
Fig. 126: Identifying Center Airbag Sensor & RSCA OFF Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Result
RESULT TABLE
A: REPLACE INSTRUMENT PANEL WIRE
B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Column Shift Type) )
C: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Floor Shift Type) )
J38-4 (SW) - Body ground
Ignition switch ON
Below 1 V
J38-1 (E) - Body ground
Result
Proceed to
NG
A
OK (for Column Shift Type)
B
OK (for Floor Shift Type)
C
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
DTC B1662/45: INDICATOR LIGHT CIRCUIT MALFUNCTION
DESCRIPTION
The indicator light circuit consists of the center airbag sensor and the combination meter.
When the center airbag sensor detects a malfunction in the SRS airbag system, the SRS warning light comes on
to inform the driver. It also comes on when the source voltage drops, and automatically goes off in
approximately 10 seconds after the source voltage returns to normal (DTC is not stored).
The SRS warning light comes on for 6 seconds after the ignition switch is turned ON and goes off if the system
is normal.
When an open circuit is detected, such as when the connector between the combination meter assembly and the
center airbag sensor is disconnected, the SRS warning light remains on even when approximately 6 seconds
elapsed after the ignition switch is turned ON.
DTC B1662/45 is recorded when a malfunction is detected in the indicator light circuit.
DTC TROUBLE DETECTION CONDITION TABLE
HINT:
When DTC B1662/45 and B1000/31 are output simultaneously, perform the troubleshooting for DTC B1662/45
first.
WIRING DIAGRAM
DTC No.
DTC Detection Condition
Trouble Area
B1662/45
The center airbag sensor receives an open circuit signal, a
short circuit to ground signal or a short circuit to B+
signal in the indicator light circuit for 2 seconds.
Combination meter malfunction
Center airbag sensor malfunction
Combination meter
assembly (SRS warning
light)
Center airbag sensor
assembly
Instrument panel wire
2009 Toyota Tundra
2009 RESTRAINTS Supplemental Restraint System - Tundra
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