Pre-Collision Brake Cancel Switch Circuit [12/2015 - 11/2017]: Procedure

1. Use the Data List to check if the pre-collision brake cancel switch is functioning properly.
   PRE-COLLISION 2
   
   

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

   OK

   On screen, each 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 [12/2015 - 11/2017] )

Result: 

NG 

See step  2

1. Remove the pre-collision brake cancel switch (Refer to REMOVAL [12/2015 - 11/2017] ).

   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 - 2	Pressed	Below 1 Ω
   	Not pressed	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Pre-collision Brake Cancel Switch)

3. Reinstall the pre-collision brake cancel switch (Refer to INSTALLATION [12/2015 - 11/2017] ).

Result: 

NG 

REPLACE PRE-COLLISION BRAKE CANCEL SWITCH 

(Refer to REMOVAL [12/2015 - 11/2017] )

Result: 

OK 

See step  3

1. Disconnect the D4 pre-collision brake cancel switch connector.
2. Disconnect the A44 driving support ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D4-1 - A44-5 (PBSW)	Always	Below 1 Ω
   D4-1 - Body ground	Always	10 kΩ or higher

4. Reconnect the driving support ECU connector.
5. Reconnect the pre-collision brake cancel switch connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the D4 pre-collision brake cancel switch connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D4-2 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Pre-collision Brake Cancel Switch)

3. Reconnect the pre-collision brake cancel switch connector.

Result: 

OK 

REPLACE DRIVING SUPPORT ECU 

(Refer to REMOVAL [12/2015 - 11/2017] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR