DTC C1595/55 Lost Communication with Steering Angle Sensor Module; DTC C15C4/74 Steering Angle Signal (Test Mode DTC): Wiring Diagram

1. Check that a steering angle sensor with the specified part number is installed.

   Standard: 

   A steering angle sensor with the specified part number (89245-30070) is installed. 

NG : REPLACE STEERING ANGLE SENSOR 

OK : GO TO NEXT STEP 

1. Turn the engine switch off.
2. Disconnect the connectors from the steering control ECU and the steering angle sensor.
3. Measure the resistance according to the value(s) in the table below.

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Specified condition
   K70-10 (SS1-) - K19-7 (SS1-)	Below 1 Ω
   K70-19 (SS1+) - K19-8 (SS1+)	Below 1 Ω
   K70-19 (SS1+) - Body ground	10 kΩ or higher
   K70-10 (SS1-) - Body ground	10 kΩ or higher
   K70-19 (SS1+) - K70-10 (SS1-)	1 kΩ or higher

NG : REPAIR OR REPLACE WIRE HARNESS 

Fig 2: Identifying K70 And K19 Connectors From Steering Control ECU And Steering Angle Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Connect the connector to the steering angle sensor.
2. Adjust the shift lever to neutral.
3. Jack up the vehicle.
4. Turn the engine switch on (IG).
5. Check the signal waveform according to the condition in the table below.

   Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Condition	Specified condition
   K70-19 (SS1+) - K70-10 (SS1-)	Engine switch on (IG), rotate steering wheel slowly	Pulse generation (0 --> 5 V)

   HINT:

   The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

NG : REPLACE STEERING ANGLE SENSOR 

Fig 3: Connecting Connector To Steering Angle Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE STEERING CONTROL ECU