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Last Modified: 11-27-2007 1.6 U
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000000W0O00KX
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: TERMINALS OF ECU (2008 LX570)

TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)



(a) Disconnect the E29 and E30 ECU connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

E29-1 (+B) - Body ground

B - Body ground

+B power supply

Always

11 to 14 V

E29-18 (IG) - Body ground

B - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 Ω

E29-17 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the E29 and E30 ECU connectors.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

E29-2 (IND) - Body ground

V - Body ground

Security indicator signal

Security indicator illuminates (illuminates only for 60 sec. in alarm sounding state (blinking when system in armed state))

6 to 11 V

E30-20 (SH-) - Body ground

LG - Body ground

Security horn signal

Security horn not sounding (theft deterrent system in alarm sounding state)

11 to 14 V

Security horn sounding (theft deterrent system in alarm sounding state)

0.5 to 4 V

E30-24 (HSW) - Body ground

W - Body ground

Engine hood courtesy switch signal

Engine hood closed

10 kΩ or higher

Engine hood open

Below 1 Ω

If the result is not as specified, the ECU may have a malfunction.

2. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)



(a) Disconnect the 2A, 2B, 2D and E3 ECU connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2A-1 (ALTB) - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

2B-20 (BATB) - Body ground

L - Body ground

Battery power supply

Always

11 to 14 V

2A-1 (IG) - Body ground

B - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

2A-1 (ACC) - Body ground

B - Body ground

ACC power supply

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

2D-62 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

E3-1 (GND3) - Body ground

BR - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the 2A, 2B, 2D and E3 ECU connectors.

(d) Measure the voltage of the connectors.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

E1-24 (DCTY) - Body ground

L - Body ground

Driver side door courtesy switch input

Driver side door open

Below 1 V

Engine switch off, and driver side door courtesy switch off

Pulse generation (see waveform 1 or 2)

E2-21 (PCTY) - Body ground

Y - Body ground

Front passenger side door courtesy switch input

Front passenger side door open

Below 1 V

Engine switch off, and passenger side door courtesy switch off

Pulse generation (see waveform 3 or 4)

2C-2 (LCTY) - Body ground

W - Body ground

Rear door LH courtesy light switch input

Rear door LH open

Below 1 V

Engine switch off, and rear LH side door courtesy switch off

Pulse generation (see waveform 5 or 6)

E2-7 (RCTY) - Body ground

G - Body ground

Rear door RH courtesy light switch input

Rear door RH open

Below 1 V

Engine switch off, and rear RH side door courtesy switch off

Pulse generation (see waveform 7 or 8)

E2-25 (BCTY) - Body ground

W - Body ground

Back door courtesy light switch input

Back door open

Below 1 V

Engine switch off, and back door closed

Pulse generation (see waveform 9 or 10)

2D-3 (ACT+) - Body ground

L - Body ground

Driver side door lock motor lock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder lock

11 to 14 V

E1-5 (ACTD) - Body ground

B - Body ground

Driver side door lock motor unlock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder unlock

11 to 14 V

2D-3 (ACT+) - Body ground

L - Body ground

Front passenger side door lock motor lock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder lock

11 to 14 V

2D-2 (ACT-) - Body ground

B - Body ground

Front passenger side door lock motor unlock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder unlock

11 to 14 V

2D-3 (ACT+) - Body ground

L - Body ground

Rear door LH lock motor lock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder lock

11 to 14 V

2C-23 (ACT-) - Body ground

B - Body ground

Rear door LH lock motor unlock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder unlock

11 to 14 V

2D-3 (ACT+) - Body ground

L - Body ground

Rear door RH lock motor lock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder lock

11 to 14 V

2D-2 (ACT-) - Body ground

B - Body ground

Rear door RH lock motor unlock drive output

Master switch (door control switch) or driver side door key cylinder off

Below 1 V

Master switch (door control switch) or driver side door key cylinder unlock

11 to 14 V

E1-10 (UL3) - Body ground

Y - Body ground

Driver side door lock key switch input

Driver side door key cylinder unlock

Below 1 V

Engine switch off, all doors closed and driver side door key cylinder neutral position

Pulse generation (see waveform 11 or 12)

2D-53 (L2) - Body ground

LG - Body ground

Driver side door lock key switch input

Driver side door key cylinder lock

Below 1 V

Engine switch off, all doors closed and driver side door key cylinder neutral position

Pulse generation (see waveform 13 or 14)

E1-9 (LSWD) - Body ground

BR - Body ground

Driver side door lock position switch input

Driver side door unlock

Below 1 V

Engine switch off, all doors closed and driver side door lock

Pulse generation (see waveform 15 or 16)

E2-27 (LSWP) - Body ground

Y - Body ground

Passenger side door lock position switch input

Passenger side door unlock

Below 1 V

Engine switch off, all doors closed and passenger side door lock

Pulse generation (see waveform 17 or 18)

2C-1 (LSWL) - Body ground

BR - Body ground

Rear door LH lock position switch input

Rear door LH unlock

Below 1 V

Engine switch off, all doors closed and rear door LH lock

Pulse generation (see waveform 19 or 20)

E2-5 (LSWR) - Body ground

BR - Body ground

Rear door RH lock position switch input

Rear door RH unlock

Below 1 V

Engine switch off, all doors closed and rear door RH lock

Pulse generation (see waveform 21 or 22)

E1-26 (BDSU) - Body ground

L - Body ground

Back door opener switch input

Back door lock opener switch off

Below 1 V

Back door lock opener switch on

Pulse generation (see waveform 23 or 24)

If the result is not as specified, the ECU may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item

Content

Terminal No. (Symbol)

E1-24 (DCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and driver side door courtesy switch off

(f) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item

Content

Terminal No. (Symbol)

E1-24 (DCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and driver side door courtesy switch off

(g) Using an oscilloscope, check waveform 3.

Waveform 3 (Reference)

Item

Content

Terminal No. (Symbol)

E2-21 (PCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and passenger side door courtesy switch off

(h) Using an oscilloscope, check waveform 4.

Waveform 4 (Reference)

Item

Content

Terminal No. (Symbol)

E2-21 (PCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and passenger side door courtesy switch off

(i) Using an oscilloscope, check waveform 5.

Waveform 5 (Reference)

Item

Content

Terminal No. (Symbol)

2C-2 (LCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and rear LH side door courtesy switch off

(j) Using an oscilloscope, check waveform 6.

Waveform 6 (Reference)

Item

Content

Terminal No. (Symbol)

2C-2 (LCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and rear LH side door courtesy switch off

(k) Using an oscilloscope, check waveform 7.

Waveform 7 (Reference)

Item

Content

Terminal No. (Symbol)

E2-7 (RCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and rear RH side door courtesy switch off

(l) Using an oscilloscope, check waveform 8.

Waveform 8 (Reference)

Item

Content

Terminal No. (Symbol)

E2-7 (RCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and rear RH side door courtesy switch off

(m) Using an oscilloscope, check waveform 9.

Waveform 9 (Reference)

Item

Content

Terminal No. (Symbol)

E2-25 (BCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and back door closed

(n) Using an oscilloscope, check waveform 10.

Waveform 10 (Reference)

Item

Content

Terminal No. (Symbol)

E2-25 (BCTY) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, and back door closed

(o) Using an oscilloscope, check waveform 11.

Waveform 11 (Reference)

Item

Content

Terminal No. (Symbol)

E1-10 (UL3) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door key cylinder neutral position

(p) Using an oscilloscope, check waveform 12.

Waveform 12 (Reference)

Item

Content

Terminal No. (Symbol)

E1-10 (UL3) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door key cylinder neutral position

(q) Using an oscilloscope, check waveform 13.

Waveform 13 (Reference)

Item

Content

Terminal No. (Symbol)

2D-53 (L2) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door key cylinder neutral position

(r) Using an oscilloscope, check waveform 14.

Waveform 14 (Reference)

Item

Content

Terminal No. (Symbol)

2D-53 (L2) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door key cylinder neutral position

(s) Using an oscilloscope, check waveform 15.

Waveform 15 (Reference)

Item

Content

Terminal No. (Symbol)

E1-9 (LSWD) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door lock

(t) Using an oscilloscope, check waveform 16.

Waveform 16 (Reference)

Item

Content

Terminal No. (Symbol)

E1-9 (LSWD) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and driver side door lock

(u) Using an oscilloscope, check waveform 17.

Waveform 17 (Reference)

Item

Content

Terminal No. (Symbol)

E2-27 (LSWP) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and passenger side door lock

(v) Using an oscilloscope, check waveform 18.

Waveform 18 (Reference)

Item

Content

Terminal No. (Symbol)

E2-27 (LSWP) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and passenger side door lock

(w) Using an oscilloscope, check waveform 19.

Waveform 19 (Reference)

Item

Content

Terminal No. (Symbol)

2C-1 (LSWL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and rear door LH lock

(x) Using an oscilloscope, check waveform 20.

Waveform 20 (Reference)

Item

Content

Terminal No. (Symbol)

2C-1 (LSWL) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and rear door LH lock

(y) Using an oscilloscope, check waveform 21.

Waveform 21 (Reference)

Item

Content

Terminal No. (Symbol)

E2-5 (LSWR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and rear door RH lock

(z) Using an oscilloscope, check waveform 22.

Waveform 22 (Reference)

Item

Content

Terminal No. (Symbol)

E2-5 (LSWR) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and rear door RH lock

(aa) Using an oscilloscope, check waveform 23.

Waveform 23 (Reference)

Item

Content

Terminal No. (Symbol)

E1-26 (BDSU) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and back door lock opener switch on

(ab) Using an oscilloscope, check waveform 24.

Waveform 24 (Reference)

Item

Content

Terminal No. (Symbol)

E1-26 (BDSU) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Engine switch off, all doors closed and back door lock opener switch on