DTC C1A75-87: Steering Vibrator System Missing Message [10/2018 - 07/2022]: Procedure

1. Remove the spiral cable sub-assembly.

   Refer to REMOVAL [10/2018 - 07/2022]

2. Inspect the spiral cable sub-assembly.

   Refer to INSPECTION [10/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  COMPONENTS [10/2018 - ] 

Result: 

OK 

See step  2

1. Turn the ignition switch off.
2. Disconnect the F21 spiral cable sub-assembly connector.
3. Turn the ignition switch to ON.
4. Using an oscilloscope, measure the waveform at F21 spiral cable sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Measurement Condition

   Tester Connection	Switch Condition	Tester Range
   F21-1 (LDA) - Body ground	Ignition switch ON	5 V/DIV., 1 ms/DIV.

   NOTE:

   The oscilloscope waveform is for reference only and does not include noise, fluctuations, etc.

   OK

   A waveform similar to that in the illustration can be observed.

5. Connect the F21 spiral cable sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Disconnect the F21 spiral cable sub-assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F21-4 (BHT) - Body ground	Ignition switch ON	11 to 14 V

3. Connect the F21 spiral cable sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE) 

Result: 

OK 

See step  4

1. Turn the ignition switch off.
2. Disconnect the F21 spiral cable sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F21-2 (EHT) - Body ground	Always	Below 1 Ω

4. Connect the F21 spiral cable sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING VIBRATION ECU. Refer to  COMPONENTS [10/2018 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) 

1. Turn the ignition switch off.
2. Disconnect the S4 forward recognition camera connector.
3. Disconnect the F21 spiral cable sub-assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F21-1 (LDA) - S4-2 (STRV)	Always	Below 1 Ω
   F21-1 (LDA) or S4-2 (STRV) - Body ground	Ignition switch off	10 kΩ or higher

5. Connect the F21 spiral cable sub-assembly connector.
6. Connect the S4 forward recognition camera connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  COMPONENTS [10/2018 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)