Toyota Yaris: Theft Deterrent System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / Terminals Of Ecu

TERMINALS OF ECU

Power Distribution Box Assembly

Main Body ECU (Multiplex Network Body ECU)

CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

(b) Reconnect the power distribution box assembly connector.

HINT:

Measure the values on the wire harness side with the connectors connected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
MB-13 (GND1) - Body ground	Ground	Always	Below 1 Ω
MB-14 (GND2) - Body ground	Ground	Always	Below 1 Ω
MB-26 (BECU) - Body ground	Auxiliary battery power supply	Always	11 to 14 V
MB-27 (IGR) - Body ground	IG power supply	Ignition switch ON	11 to 14 V

(d) Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
4E-5 (FRCY) - Body ground	Front door courtesy light switch (for RH) input	Front door RH open	Below 1 V
4E-5 (FRCY) - Body ground	Front door courtesy light switch (for RH) input	Front door RH closed	11 to 14 V
4E-3 (FLCY) - Body ground	Front door courtesy light switch (for LH) input	Front door LH open	Below 1 V
4E-3 (FLCY) - Body ground	Front door courtesy light switch (for LH) input	Front door LH closed	11 to 14 V
4E-2 (BCTY) - Body ground	Back door courtesy light switch input	Back door closed	Below 1 V
4E-2 (BCTY) - Body ground	Back door courtesy light switch input	Back door open	11 to 14 V
H4-3 (LSFR) - Body ground	Front door RH unlock detection switch input	Front door RH unlocked	Below 1 V
H4-3 (LSFR) - Body ground	Front door RH unlock detection switch input	Front door RH locked	Pulse generation
H4-9 (LSFL) - Body ground	Front door LH unlock detection switch input	Front door LH unlocked	Below 1 V
H4-9 (LSFL) - Body ground	Front door LH unlock detection switch input	Front door LH locked	Pulse generation
H4-28 (L2) - Body ground	Driver door key-linked lock input	Driver door key cylinder turned to lock	Below 1 V
H4-28 (L2) - Body ground	Driver door key-linked lock input	Driver door key cylinder not turned	Pulse generation
H4-4 (UL3) - Body ground	Driver door key-linked unlock input	Driver door key cylinder turned to unlock	Below 1 V
H4-4 (UL3) - Body ground	Driver door key-linked unlock input	Driver door key cylinder not turned	Pulse generation
H4-27 (HCTY) - Body ground	Engine hood courtesy switch input signal	Back door closed (OFF) → open (ON)	10 kΩ or higher → Below 1 Ω
4D-4 (SH) - Body ground	Security horn drive	Security horn sounding (Theft deterrent system is in alarm sounding state)	Pulse generation (Below 1 V ←→ 11 to 14 V)
4B-43 (HORN) - Body ground	Vehicle horn drive	Vehicle horns sounding (Theft deterrent system is in alarm sounding state)	Pulse generation (Below 1 V ←→ 11 to 14 V)
4D-11 (HORN) - Body ground	Vehicle horn drive		Pulse generation (Below 1 V ←→ 11 to 14 V)

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration. Click here HINT: Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally...

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...

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