Diagnosis Procedure
- CHECK WARNING SYSTEM SWITCH SIGNAL INPUT
- Turn the ignition switch ON.
- While operating the warning system switch, check voltage between ADAS control unit harness connector and ground.
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
ADAS control unit
Ground
Warning system switch
Connector
Terminal
M128
23
Pressed
0 V
Released
Battery voltage
Is the inspection result normal?
YES
Replace the ADAS control unit. Refer to Removal and Installation .
NO
GO TO 2 .
- CHECK WARNING SYSTEM SWITCH
- Check warning system switch. Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 3 .
NO
Replace the warning system switch. Refer to Removal and Installation .
- CHECK WARNING SYSTEM SWITCH GROUND CIRCUIT
Check continuity between warning system switch harness connector and the ground.
Warning system switch
Ground
Continuity
Connector
Terminal
M127
8
Yes
Is the inspection result normal?
YES
GO TO 4 .
NO
Repair harness or connector.
- CHECK WARNING SYSTEM SWITCH SIGNAL INPUT CIRCUIT FOR OPEN
- Disconnect the ADAS control unit connector.
- Check continuity between the ADAS control unit harness connector and warning system switch harness connector.
ADAS control unit
Warning system switch
Continuity
Connector
Terminal
Connector
Terminal
M128
23
M127
6
Yes
Is the inspection result normal?
YES
GO TO 5 .
NO
Repair the harnesses or connectors.
- CHECK WARNING SYSTEM SWITCH SIGNAL INPUT CIRCUIT FOR SHORT
Check continuity between the ADAS control unit harness connector and ground.
ADAS control unit
Ground
Continuity
Connector
Terminal
M128
23
No
Is the inspection result normal?
YES
Replace the ADAS control unit. Refer to Removal and Installation .
NO
Repair the harnesses or connectors.