Pre-Collision Brake Cancel Switch Circuit [08/2015 - 08/2019]: Procedure

1. Use the Data List to check if the pre-collision brake cancel switch assembly is functioning properly (Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2019] ).
   PRE-COLLISION 2
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Pre-Collision Brake OFF Switch	Pre-collision brake cancel switch assembly signal / ON or OFF	ON: Pre-collision brake cancel switch assembly on OFF: Pre-collision brake cancel switch assembly off	-

   OK

   On screen, item changes between ON and OFF according to above chart.

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] )

Result: 

NG 

See step  2

1. Remove the pre-collision brake cancel switch assembly (Refer to REMOVAL [08/2015 - 08/2019] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 (GND) - 2 (ECU)	Pressed	Below 1 Ω
   1 (GND) - 2 (ECU)	Not pressed	10 kΩ or higher

Result: 

NG 

REPLACE PRE-COLLISION BRAKE CANCEL SWITCH ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

OK 

See step  3

1. Disconnect the G52 switch connector.
2. Disconnect the G43 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G52-2 (ECU) - G43-5 (PBSW)	Always	Below 1 Ω
   G52-1 (GND) - Body ground	Always	Below 1 Ω
   G52-2 (ECU) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE DRIVING SUPPORT ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR