CLOCK - TERMINALS OF ECU

Clock Assembly (without Navigation System)

Clock - Terminals Of Ecu. OTHER SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
ILL+ (J54-3) - Body ground	G - Body ground	Illumination Signal	Combination switch OFF	Below 1 V
ILL+ (J54-3) - Body ground	G - Body ground	Illumination Signal	Combination switch Head	10 to 14 V
IG+ (J54-4) - Body ground	B - Body ground	Ignition Switch Signal	Engine switch off	Below 1 V
IG+ (J54-4) - Body ground	B - Body ground	Ignition Switch Signal	Engine switch on (IG)	10 to 14 V
ACC (J54-5) - Body ground	O - Body ground	Ignition Switch Signal	Engine switch off	Below 1 V
ACC (J54-5) - Body ground	O - Body ground	Ignition Switch Signal	Engine switch on (IG)	10 to 14 V
E (J54-8) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
ILL-(J54-10) - Body ground	LG - Body ground	Illumination Signal	Engine switch on (IG), combination switch Head, and light control rheostat position MAX.	Pulse generation (See waveform)
B (J54-14) - Body ground	LG - Body ground	Battery	Always	10 to 14 V

Waveform (Reference) : Using an oscilloscope:

OK:
Item	Condition
Tool setting	5 V/DIV., 200 ms./DIV.
Vehicle condition	Engine switch on (IG), light control rheostat is in the MID. position.

Clock Assembly (with Navigation System)

Clock - Terminals Of Ecu. OTHER SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
E (J53-2) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
ILL+ (J53-4) - Body ground	G - Body ground	Illumination Signal	Combination switch OFF	Below 1 V
ILL+ (J53-4) - Body ground	G - Body ground	Illumination Signal	Combination switch Head	10 to 14 V
ACC (J53-5) - Body ground	W-B - Body ground	Ignition Switch Signal	Engine switch off	Below 1 V
ACC (J53-5) - Body ground	W-B - Body ground	Ignition Switch Signal	Engine switch on (IG)	10 to 14 V
+B (J53-6) - Body ground	BR - Body ground	Battery	Always	10 to 14 V
ILL-(J53-10) - Body ground	W - Body ground	Illumination Signal	Engine switch on (IG), combination switch Head, and light control rheostat position MAX.	Pulse generation (See waveform)
IG (J53-11) - Body ground	B - Body ground	Ignition Switch Signal	Engine switch off	Below 1 V
IG (J53-11) - Body ground	B - Body ground	Ignition Switch Signal	Engine switch on (IG)	10 to 14 V

Waveform (Reference) : Using an oscilloscope:

OK:
Item	Condition
Tool setting	5 V/DIV., 200 ms./DIV.
Vehicle condition	Engine switch on (IG), light control rheostat is in the MID. position.