DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module: Procedure

PRECAUTION
NOTE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work. Refer to PRECAUTION [09/2012 - ] .

NEXT: Go to next step
DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
1. Disconnect the cable from the negative (-) auxiliary battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
  WARNING:
  Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
  
  NOTE:
  When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [09/2012 - ] .
NEXT: Go to next step

CHECK FOR OPEN IN CAN BUS WIRE (YAW RATE SENSOR CAN BRANCH WIRE)

Disconnect the yaw rate sensor connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
L71-3 (CANH) - L71-2 (CANL)	Power switch off	54 to 69 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Yaw Rate Sensor)

NG → REPAIR OR REPLACE YAW RATE SENSOR CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (YAW RATE SENSOR - BATTERY AND BODY GROUND)

Connect the cable to the negative (-) auxiliary battery terminal.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [09/2012 - ] .

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
L71-4 (IG) - Body ground	Power switch on (IG)	11 to 14 V

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

Standard Resistance

Tester Connection	Condition	Specified Condition
L71-1 (GND) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Yaw Rate Sensor)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 5