DTC C1595-55: Lost Communication with Steering Angle Sensor Module; DTC C15C4-68: Steering Angle Signal (Test Mode DTC) [09/2015 - 08/2020]: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR [09/2015 - 08/2020] .
   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 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2015 - 08/2020] )

Result: 

A 

See step  2

1. Turn the engine switch off.
2. Disconnect the E129 VGRS ECU (steering control ECU) connector.
3. Disconnect the E131 steering sensor connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E129-5 (SS1-) - E131-9 (SS2-)	Always	Below 1 Ω
   E129-6 (SS1+) - E131-8 (SS2+)	Always	Below 1 Ω
   E129-5 (SS1-) or E131-9 (SS2-) - Body ground	Always	100 kΩ or higher
   E129-6 (SS1+) or E131-8 (SS2+) - Body ground	Always	100 kΩ or higher
   E129-5 (SS1-) - E129-6 (SS1+)	Always	1000 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Reconnect the E129 VGRS ECU (steering control ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Reconnect the E131 steering sensor connector.
3. Start the engine.
4. Measure the voltage according to the value(s) in the table below.

   HINT: 

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E129-5 (SS1-) - E129-6 (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 [Steering Control ECU])

Result: 

OK 

REPLACE VGRS ECU (STEERING CONTROL ECU) 

Refer to REMOVAL [09/2015 - ] )

Result: 

NG 

REPLACE STEERING SENSOR 

Refer to REMOVAL [09/2015 - ] )