Toyota RAV4 (XA40) 2013-2018 Service Manual: Srs warning light does not come on
Description
The srs warning light is located on the combination meter.
When the srs is normal, the srs warning light comes on for approximately 6 seconds after the ignition switch is turned from off to on, and then goes off automatically.
If there is a malfunction in the srs, the srs warning light comes on to inform the driver of a problem.
When terminals tc and cg of the dlc3 are connected, the dtc is displayed by blinking the srs warning light.
The srs is equipped with a voltage-increase circuit (dc-dc converter) in the center airbag sensor in case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (dc-dc converter) functions to increase the voltage of the srs to normal voltage.
A malfunction in this circuit is not recorded in the center airbag sensor . The srs warning light automatically goes off when the source voltage returns to normal.
The signal to illuminate the srs warning light is transmitted from the center airbag sensor to the combination meter through the multiplex communication system.
Wiring diagram
Inspection procedure
- Check battery
- Measure the voltage of the battery.
Standard voltage: 11 to 14 v
- Check connectors
- Turn the ignition switch off.
- Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
- Check that the e19 connectors are properly connected to the center airbag sensor and the combination meter.
Ok: the connectors are properly connected.
- Check wire harness (source voltage of combination meter)
- Turn the ignition switch off.
- Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
- Disconnect the connector from the combination meter.
- Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
- Turn the ignition switch on.
- Measure the voltage of the wire harness side connectors.
Standard voltage 
- Turn the ignition switch off.
- Measure the resistance of the wire harness side connectors.
Standard resistance 
- Check srs warning light
- Turn the ignition switch off.
- Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
- Connect the e19 connector to the combination meter.
- Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
- Turn the ignition switch on.
- Check the srs warning light condition.
Ok: the srs warning light does not come on.
Replace center airbag sensor assembly
Srs warning light remains on
Description
The srs warning light is located on the combination meter.
When the srs is normal, the srs warning light comes on for approximately 6
seconds after the ignition
switch is turned fro ...
Tc and cg terminal circuit
Description
Dtc output mode is set by connecting terminals tc and cg of the dlc3.
The dtcs are displayed by blinking the srs warning light.
Hint:
Make sure that dtc b1281 has not been output. ...
Other materials:
Unlock warning switch
Inspection
Inspect unlock warning switch assembly
Measure the resistance of the switch.
Standard resistance
If the result is not as specified, replace the switch
assembly.
Ecu power source circuit
Description
This circuit provides power to operate the transponder key ecu.
Wir ...
Motor rotation angle sensor malfunction
Description
The motor rotation angle sensor detects the motor rotation angle and sends
this information to the power
steering ecu.
Wiring diagram
Inspection procedure
Check connector connection condition
Check the installation condition of the motor rotation
angle senso ...
Functions included in
LTA system
â– Lane departure alert function
When the system determines that the vehicle might depart
from its lane or course*, a warning
is displayed on the multi-information
display, and a warning
buzzer will sound to alert the
driver.
When the warning buzzer sounds,
check the area around your vehicle
and c ...
