Pre-Collision Brake Cancel Switch Circuit

PRE-COLLISION: PRE-COLLISION SYSTEM: Pre-Collision Brake Cancel Switch Circuit
- Pre-Collision Brake Cancel Switch Circuit

DESCRIPTION

The driving support ECU receives pre-collision brake on/off signal from pre-collision system cancel switch.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (PRE-COLLISION BRAKE CANCEL SWITCH)

(a) Use the Data List to check if the pre-collision brake cancel switch is functioning properly.

Pre-Collision 2

OK:

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

NG -- INSPECT PRE-COLLISION BRAKE CANCEL SWITCH

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Pre-Collision System

2. INSPECT PRE-COLLISION BRAKE CANCEL SWITCH

(a) Remove the pre-collision brake cancel switch Removal.

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

Standard Resistance:

Text in Illustration

(c) Reinstall the pre-collision brake cancel switch Installation.

NG -- REPLACE PRE-COLLISION BRAKE CANCEL SWITCH Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (PRE-COLLISION BRAKE CANCEL SWITCH - DRIVING SUPPORT ECU)

(a) Disconnect the D4 pre-collision brake cancel switch connector.

(b) Disconnect the A44 driving support ECU connector.

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

Standard Resistance:

(d) Reconnect the driving support ECU connector.

(e) Reconnect the pre-collision brake cancel switch connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (PRE-COLLISION BRAKE CANCEL SWITCH - BODY GROUND)

(a) Disconnect the D4 pre-collision brake cancel switch connector.

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

Standard Resistance:

Text in Illustration

(c) Reconnect the pre-collision brake cancel switch connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE DRIVING SUPPORT ECU Removal