Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

When U0121/94, U0123/62, U0124/95 or U0126/63 are output accompanied with C1210/36 or C1336/39, inspect and repair the trouble areas indicated by U0121/94, U0123/62, U0124/95 or U0126/63 first.
When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output accompanied with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate sensor first, and then inspect and repair the steering angle sensor.

CHECK TERMINAL VOLTAGE (STEERING ANGLE SENSOR CONNECTOR)
1. Remove the steering wheel and column lower cover.
2. Disconnect the steering angle sensor connector.
3. Turn the ignition switch ON.
4. Measure voltage between terminals 1 and 2, 2 and 3 of the steering angle sensor harness side connector.
  OK:
  
  Voltage: 10 to 14 V
Fig 1: Measuring Voltage Between Terminals 1 & 2, 2 & 3 Of Steering Angle Sensor Harness Side Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: REPLACE STEERING ANGLE SENSOR