Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Terminals Of Ecu

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System (w/ Smart Key System) / Terminals Of Ecu

TERMINALS OF 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.

(c) Measure the voltage and resistance according to the value(s) in the table below.

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

Ignition switch off

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

8F-5 (FRCY) - Body ground

Front door courtesy light switch (for RH) input

Front door RH open

Below 1 V

Front door RH closed

11 to 14 V

8F-3 (FLCY) - Body ground

Front door courtesy light switch (for LH) input

Front door LH open

Below 1 V

Front door LH closed

11 to 14 V

8F-1 (RCTY) - Body ground

Rear door courtesy light switch (for RH) input

Rear door RH open

Below 1 V

Rear door RH closed

Pulse generation

8F-28 (LCTY) - Body ground

Rear door courtesy light switch (for LH) input

Rear door LH open

Below 1 V

Rear door LH closed

Pulse generation

8F-2 (BCTY) - Body ground

Back door courtesy light switch input

Back door closed

Below 1 V

Back door open

11 to 14 V

8F-42 (TR+) - Body ground

Back door lock motor drive output

Back door closed → open

Below 1 V → 11 to 14 V → Below 1 V

8F-36 (ACT-) - Body ground

Door lock motor unlock drive output

Door control switch or driver door key cylinder off → on (unlock)

Below 1 V → 11 to 14 V → Below 1 V

8F-37 (ACT-) - Body ground

8F-40 (ACT+) - Body ground

Door lock motor lock drive output

Door control switch or driver door key cylinder off → on (lock)

Below 1 V → 11 to 14 V → Below 1 V

8F-41 (ACT+) - Body ground

I85-3 (LSFR) - Body ground

Front door RH unlock detection switch input

Front door RH unlocked

Below 1 V

Front door RH locked

Pulse generation

I85-9 (LSFL) - Body ground

Front door LH unlock detection switch input

Front door LH unlocked

Below 1 V

Front door LH locked

Pulse generation

I86-23 (LSWR) - Body ground

Rear door RH unlock detection switch input

Rear door RH unlocked

Below 1 V

Rear door RH locked

Pulse generation

I85-10 (LSWL) - Body ground

Rear door LH unlock detection switch input

Rear door LH unlocked

Below 1 V

Rear door LH locked

Pulse generation

I85-28 (L2) - Body ground

Driver door key-linked lock input

Driver door key cylinder turned to lock

Below 1 V

Driver door key cylinder not turned

Pulse generation

I85-4 (UL3) - Body ground

Driver door key-linked unlock input

Driver door key cylinder turned to unlock

Below 1 V

Driver door key cylinder not turned

Pulse generation

8E-7 (BZR) - Body ground

Wireless door lock buzzer output

Active Test Wireless Buzzer on

Pulse generation

Active Test Wireless Buzzer off

Below 1 V

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the I222 certification ECU (smart key ECU assembly) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

I222-29 (E) - Body ground

Ground

Always

Below 1 Ω

I222-6 (+B) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

(c) Reconnect the I222 certification ECU (smart key ECU assembly) connector.

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

Tester Connection

Terminal Description

Condition

Specified Condition

O200-21 (RCO) - I222-29 (E)

Output to door control receiver

(Power supply for door control receiver. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)

 Proceed:
  1. Ignition switch off
  2. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 1)

O200-12 (CSEL) - I222-29 (E)

Communication channel switching circuit

 Proceed:
  1. Ignition switch off
  2. Close all doors

No pulse generation → Pulse generation

O200-11 (RDAM) - I222-29 (E)

Door control receiver communication circuit

 Proceed:
  1. Ignition switch off
  2. All doors locked
  3. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
  4. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 2)

(e) Using an oscilloscope, check waveform 1.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 1 (Reference)

Item

Content

Tester Connection

O200-21 (RCO) - I222-29 (E)

Tool Setting

2 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Ignition switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

(f) Using an oscilloscope, check waveform 2.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 2 (Reference)

Item

Content

Tester Connection

O200-11 (RDAM) - I222-29 (E)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Procedure:

  1. Ignition switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

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