Pre-Crash Safety System Pre-Crash Safety Brake Cancel Switch Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER
INSPECT PRE-CRASH BRAKE CANCEL SWITCH ASSEMBLY
CHECK HARNESS AND CONNECTOR (PRE-CRASH BRAKE CANCEL SWITCH - DRIVING SUPPORT ECU)
PRE-CRASH SAFETY SYSTEM - Pre-crash Safety Brake Cancel Switch Circuit |
DESCRIPTION
The driving support ECU receives pre-crash brake on/off signals from the pre-crash brake cancel switch assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER |
Use the Data List to check if the pre-crash brake cancel switch assembly is functioning properly (LandCruiser RM0000043KP00GX.html).
Pre-Crash 2Tester Display
| Measurement Item/Range
| Normal Condition
| Diagnostic Note
|
Pre-Crash Brake OFF Switch
| Pre-crash brake cancel switch assembly signal / ON or OFF
| ON: Pre-crash brake cancel switch assembly on
OFF: Pre-crash brake cancel switch assembly off
| -
|
- OK:
- On screen, each item changes between ON and OFF according to above chart.
| 2.INSPECT PRE-CRASH BRAKE CANCEL SWITCH ASSEMBLY |
Remove the pre-crash brake cancel switch assembly (LandCruiser RM000003QHL00SX.html).
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
|
Not pressed
| 10 kΩ or higher
|
| 3.CHECK HARNESS AND CONNECTOR (PRE-CRASH BRAKE CANCEL SWITCH - DRIVING SUPPORT ECU) |
Disconnect the G121 switch connector.
Disconnect the G119 ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
G121-2 (ECU) - G119-5 (PBSW)
| Always
| Below 1 Ω
|
G121-1 (GND) - Body ground
|
G121-2 (ECU) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
