Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

*2: For details about conditions when the certification ECU (smart key ECU assembly) sends the charging suspension signal .

J78-1 (PGND) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

J78-5 (ACC) - J78-1 (PGND)

R - W-B

Power source (ACC)

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

J78-6 (B+) - J78-1 (PGND)

SB - W-B

Power source (+B)

Always

11 to 14 V

J78-7 (DIS) - Body ground

V - Body ground

Charging suspension signal

For 5 seconds after turning engine switch from off to on (ACC)*1

4.5 to 6.0 V

Device being charged

Below 1 V

Charging suspended due to smart entry and start system status*2

4.5 to 6.0 V

J78-9 (ILL-) - Body ground

G - Body ground

Illumination (rheo stat) signal

Light control switch in off position

Below 1 V

Light control switch in tail or head position

Pulse generation

J78-10 (TAIL) - Body ground

BE - Body ground

Illumination signal

Light control switch in off position

Below 1 V

Light control switch in tail or head position

11 to 14 V