Distance Control Switch Circuit [05/2019 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Radar Cruise2 / Data List.
5. Read the Data List according to the display on the Techstream.

   Powertrain > Radar Cruise2 > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Vehicle-to-vehicle Distance Control Switch	Vehicle-to-vehicle distance control switch signal	ON or OFF	ON: Vehicle-to-vehicle distance control switch pushed OFF: Vehicle-to-vehicle distance control switch not pushed	-

   Powertrain > Radar Cruise2 > Data List 

   Tester Display
   Vehicle-to-vehicle Distance Control Switch

   OK

   The value of the Data List item changes according to the operation of the vehicle-to-vehicle distance control switch.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [05/2019 - ] 

Result: 

NG 

See step  2

1. Remove the steering pad switch assembly.

   Refer to REMOVAL [09/2017 - ]

2. Inspect the steering pad switch assembly.

   Refer to INSPECTION [09/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [09/2017 - ] 

Result: 

OK 

See step  3

1. Remove the spiral cable sub-assembly.

   Refer to REMOVAL [05/2019 - ]

2. Inspect the spiral cable sub-assembly.

   Refer to INSPECTION [09/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [05/2019 - ] 

Result: 

OK 

See step  4

1. Disconnect the G20 spiral cable sub-assembly connector.
2. Disconnect the P8 forward recognition camera connector.
3. Disconnect the A24 ECM connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G20-6 (DIST) - P8-3 (LKSW)	Always	Below 1 Ω
   G20-2 (ECC) - A24-28 (ECCS)	Always	Below 1 Ω
   G20-6 (DIST) or P8-3 (LKSW) - Body ground	Always	10 kΩ or higher
   G20-2 (ECC) or A24-28 (ECCS) - Body ground	Always	10 kΩ or higher

5. Connect the A24 ECM connector.
6. Connect the P8 forward recognition camera connector.
7. Connect the G20 spiral cable sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the A24 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to ECM)

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A24-10 (E1) - Body ground	Always	Below 1 Ω

3. Connect the A24 ECM connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   28 (ECCS) - 10 (E1)	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (ECM)

3. Connect the ECM connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [05/2019 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [05/2019 - ]