Pre-Collision Brake Cancel Switch Circuit: 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 signal/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.

NG → See step   2 

OK → See step   5 

1. Remove the pre-collision brake cancel switch assembly. Refer to REMOVAL .
   Fig 1: Inspecting Pre-Collision Brake Cancel Switch

   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 Assembly)

3. Reinstall the pre-collision brake cancel switch assembly. Refer to INSTALLATION .

NG → See step   6 

OK: Go to next step 

1. Disconnect the pre-collision brake cancel switch assembly connector.
   Fig 2: Identifying Pre-Collision Brake Cancel Switch Assembly And Driving Support ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the driving support ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L108-1 - L60-5 (PBSW)	Always	Below 1 Ω
   L108-1 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Pre-collision Brake Cancel Switch Assembly)
   *2	Front view of wire harness connector (to Driving Support ECU)

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION BRAKE CANCEL SWITCH - DRIVING SUPPORT ECU) 

OK: Go to next step 

1. Disconnect the pre-collision brake cancel switch assembly connector.
   Fig 3: Identifying Pre-Collision Brake Cancel Switch Assembly Connector Terminals

   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
   L108-2 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION BRAKE CANCEL SWITCH ASSEMBLY - BODY GROUND) 

OK → See step   7