TERMINALS OF ECU
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
J157-1 (+B) - J157-20 (E) | Y - W-B | Power source (+B) | Always | 11 to 14 V |
J157-3 (SIG-) - J157-20 (E) | G - W-B | Ground | Always | Below 1 V |
J157-4 (IND1) - J157-20 (E) | LG - W-B | Manual (SOS) switch red indicator illumination signal | For 2 seconds after turning the engine switch on (IG) | 1 to 8.5 V |
Engine switch off | Below 1 V | |||
J157-5 (MCVD) - J157-20 (E) | L - W-B | Telephone microphone assembly power supply | Engine switch on (ACC) | 4 to 6 V |
Engine switch off | Below 1 V | |||
J157-6 (MCI+) - J157-20 (E) | P - W-B | Receive microphone voice signal | Voice being input to telephone microphone assembly | A waveform synchronized with microphone voice signal is input |
J157-7 (MCI-) - J157-20 (E) | G - W-B | Receive microphone voice signal | Always | Below 1 V |
J157-13 (GSW) - J157-20 (E) | L - W-B | Collision detection signal | Engine switch on (IG) | Pulse generation (Refer to waveform1) |
J157-19 (IG2) - J157-20 (E) | B - W-B | Power source (IG) | Engine switch on (IG) | 11 to 14 V |
Engine switch off | Below 1 V | |||
J157-20 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
J157-21 (SIG1) - J157-3 (SIG-) | R - G | Manual (SOS) switch button condition signal | Manual (SOS) switch not pressed | 1.3 to 1.9 V |
Manual (SOS) switch pressed | 0.5 to 0.8 V | |||
J157-22 (IND2) - J157-20 (E) | V - W-B | Manual (SOS) switch green indicator illumination signal | For 2 seconds after turning the engine switch on (IG) | 1 to 8.5 V |
Engine switch off | Below 1 V | |||
J157-23 (SGND) - J157-20 (E) | Shielded - W-B | Shield ground | Always | Below 1 Ω |
J157-25 (CANP) | R | CAN communication signal | - | - |
J157-26 (CANN) | W | CAN communication signal | - | - |
CHECK DCM (TELEMATICS TRANSCEIVER)
(a) Oscilloscope waveform:
(1) Waveform 1
Item | Condition |
---|---|
Tester connection | J157-13 (GSW) - J157-20 (E) |
Tool setting | 5.0 V/DIV., 20 ms/DIV. |
Vehicle condition | Engine switch on (IG) |
CHECK RADIO RECEIVER ASSEMBLY
w/o Navigation System: Click here
w/ Navigation System: Click here
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Wiper And Washer System: Wiper Switch Signal Mismatch between LIN and Line (B1372)
DESCRIPTION Under normal operation, the front wiper motor and link assembly (wiper ECU) receives operation signals from the windshield wiper switch assembly via LIN communication. The windshield front wiper motor and link assembly (wiper ECU) and windshield wiper switch assembly are also connected v ...
Lexus RX (RX 350L, RX450h) 2016-2025 Owners Manual > Using the driving support
systems: Driving assist systems
To keep driving safety and performance, the following systems operate
automatically
in response to various driving situations. Be aware, however, that
these systems are supplementary and should not be relied upon too heavily
when operating the vehicle.
ECB (Electronically Controlled Brake Syst ...