DTC C1595/55: Lost Communication with Steering Angle Sensor Module (SIL); DTC C15C4/68: Steering Signal Not Detected [09/2014 - ]: Procedure

1. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2014 - ] ).
   RESULT
   
   

   Result	Proceed to
   DTCs C15C1/74, C15C2/74 and U0126/56 are not output	A
   DTCs C15C1/74, C15C2/74 and U0126/56 are output	B

Result:  B

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2014 - ] )

Result:  A

A 

See step  2

1. Turn the power switch off.
2. Disconnect the N158 VGRS ECU (front steering control ECU) connector.
3. Disconnect the N154 steering sensor connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N158-5 (SS1-) - N154-9 (SS2-)	Always	Below 1 Ω
   N158-6 (SS1+) - N154-8 (SS2+)	Always	Below 1 Ω
   N158-5 (SS1-) - Body ground	Always	100 kΩ or higher
   N158-6 (SS1+) - Body ground	Always	100 kΩ or higher
   N158-5 (SS1-) - N158-6 (SS1+)	Always	1000 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  3

1. Reconnect the VGRS ECU (front steering control ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Reconnect the N154 steering sensor connector.
3. Turn the power switch on (READY).
4. Measure the voltage according to the value(s) in the table below.

   HINT: 

   With the connector connected to the VGRS ECU (front steering control ECU), measure the voltage from the rear of the connector.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N158-5 (SS1-) - N158-6 (SS1+)	Steering wheel rotated slowly	Pulse waveform that alternates between 0 and 5 V is output

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (VGRS ECU [Front Steering Control ECU])

Result:  OK

OK 

REPLACE FRONT STEERING CONTROL ECU 

(Refer to REMOVAL [09/2014 - ] )

Result:  NG

NG 

REPLACE STEERING SENSOR 

(Refer to REMOVAL [09/2014 - ] )