Hint:

How to proceed with troubleshooting
Terminals of ecuHeadlight (hi-beam) circuit
Description
The body ecu controls the headlight relay, no. 2 Daytime running light relay
(marking: drl no. 2) And
no. 4 Daytime running light relay (marking: drl no. 4).
Wiring diagram
Inspection procedure
Perform active test by intelligent tester
Connect the intelligent test ...
Open in one side of can branch line
Description
If 2 or more ecus and/or sensors do not appear on the intelligent tester's
"bus check" screen via the
can vim, one side of the can branch wire may be open. (One side of the canh
[branch wire] /canl
[branch wire] of the ecu and/or sensor is open.)
Wiring diagram
...
Dtc check / clear
Check dtc
Connect the intelligent tester to the dlc3.
Turn the ignition switch on and turn the tester on.
Select the following menu item: body / sliding roof /
dtc.
Check the dtc(s).
Clear dtc
Connect the intelligent tester to the dlc3.
Turn the ignition switch on ...