DTC C1234: Yaw Rate Sensor; DTC C1472: Acceleration Sensor; DTC C1474: Forward and Rearward G Sensor [06/2017 - 10/2020]: Procedure

1. Clear the DTCs.

   Chassis > ABS/VSC/TRAC/EPB > Clear DTCs 

2. Turn the ignition switch off.
3. Start the engine.
4. At a speed of 30 km/h (18 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.
5. Turn the ignition switch off.
6. Turn the ignition switch to ON again and check that no CAN communication system DTCs are output.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ]

   Result

   Result	Proceed to
   CAN communication system DTCs are not output	A
   CAN communication system DTCs are output	B

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ] 

Result: 

A 

See step  2

1. Turn the ignition switch off.
2. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

   Refer to INSTALLATION [06/2017 - 09/2019] , or refer to INSTALLATION [09/2019 - 03/2020] , or refer to INSTALLATION [03/2020 - ]

   OK

   The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

   The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY. Refer to  INSTALLATION [06/2017 - 09/2019]  , or refer to  INSTALLATION [09/2019 - 03/2020]  , or refer to  INSTALLATION [03/2020 - ] 

Result: 

OK 

See step  3

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

   OK

   The connector is securely connected.

2. Disconnect the K73 yaw rate and acceleration sensor (airbag sensor assembly) connector.
3. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

4. Turn the ignition switch to ON.
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K73-36 (IG2) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  4

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K73-33 (E1) - Body ground	Always	Below 1 Ω
   K73-32 (E2) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 03/2020]  , or refer to  REMOVAL [03/2020 - 10/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)