Distance Control Switch Circuit [08/2021 - ]: Procedure

1. 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 [08/2021 - ] 

Result: 

NG 

See step  2

Refer to INSPECTION [06/2018 - ]

Result

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

Result: 

OK 

See step  3

Refer to INSPECTION [06/2018 - ]

Result

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

Result: 

OK 

See step  4

1. Disconnect the P5 forward recognition camera connector.
2. For A25A-FKS

   Disconnect the A28 ECM connector.

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

   Standard Resistance (for A25A-FKS)

   Tester Connection	Condition	Specified Condition
   G20-6 (DIST) - P5-3 (LKSW)	Always	Below 1 Ω
   G20-2 (ECC) - A28-28 (ECCS)	Always	Below 1 Ω
   G20-6 (DIST) or P5-3 (LKSW) - Body ground	Always	10 kΩ or higher
   G20-2 (ECC) or A28-28 (ECCS) - Body ground	Always	10 kΩ or higher

   Standard Resistance (for 2GR-FKS)

   Tester Connection	Condition	Specified Condition
   G20-6 (DIST) - P5-3 (LKSW)	Always	Below 1 Ω
   G20-2 (ECC) - Body ground	Always	Below 1 Ω
   G20-6 (DIST) or P5-3 (LKSW) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   OK (for A25A-FKS)	A
   OK (for 2GR-FKS)	B
   NG	C

Result: 

B 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [08/2021 - ] 

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

A 

See step  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-10 (E1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. 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)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [08/2021 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ]