Home › Vehicle Interior › Door Lock › WIRELESS DOOR LOCK CONTROL SYSTEM
Last Modified: 11-27-2007 1.6 U
Service Category: Vehicle Interior Section: Door Lock
Model Year: 2008 Model: LX570 Doc ID: RM000000XX400IX
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: TERMINALS OF ECU (2008 LX570)

TERMINALS OF ECU

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



(a) Disconnect the DA, DD, DF, L12 and L13 ECU connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

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

2A-1 (ACC) - 2D-62 (GND2

B - W-B

ACC power supply

Engine switch off

Below 1 V

Engine switch on (ACC)

11 to 14 V

E1-6 (AM1) - 2D-62 (GND2)

W - W-B

Battery power supply

Always

11 to 14 V

E2-1 (AM2) - 2D-62 (GND2)

W - W-B

Battery power supply

Always

11 to 14 V

2A-1 (IG) - 2D-62 (GND2)

B - W-B

IG power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

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

(c) Reconnect the DA, DD, DF, L12 and L3 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

E1-24 (DCTY) - Body ground

L - Body ground

Driver side door courtesy light switch input

Driver side courtesy switch on

Below 1 V

Engine switch off, and driver side door courtesy switch off

Pulse generation (refer to waveform 1 and 2)

E2-21 (PCTY) - Body ground

Y - Body ground

Front passenger side door courtesy light switch input

Front Passenger side courtesy switch on

Below 1 V

Engine switch off, and passenger side door courtesy switch off

Pulse generation (refer to waveform 3 and 4)

2C-2 (LCTY) - Body ground

W - Body ground

Rear side door LH courtesy light switch input

Rear side door LH courtesy switch on

Below 1 V

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

Pulse generation (refer to waveform 5 and 6)

E2-7 (RCTY) - Body ground

G - Body ground

Rear side door RH courtesy light switch input

Rear side door RH courtesy switch on

Below 1 V

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

Pulse generation (refer to waveform 7 and 8)

E2-25 (BCTY) - Body ground

w - Body ground

Back door courtesy light switch input

Back door closed

Below 1 V

Engine switch off, and back door courtesy switch off

Pulse generation (refer to waveform 9 and 10)

E3-4 (HAZ) - Body ground

O - Body ground

Turn signal light drive

Hazard warning signal switch on

Pulse generation

Hazard warning signal switch off

Below 1 V

2B-16 (DIM) - 2D-62 (GND2)

R-G - W-B

Headlight low drive

Headlight dimmer switch low

11 to 14 V

2B-18 (HRLY) - 2D-62 (GND2)

L - W-B

Headlight (high) drive

Headlight dimmer switch high

11 to 14 V

2A-1 (TRLY) - 2D-62 (GND2)

B - W-B

Taillight drive

Headlight dimmer switch tail

11 to 14 V

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 side door LH 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 side door LH 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 side door RH 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 side door RH 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

2. 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

E29-17 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

E29-1 (+B) - E29-17 (E)

B - W-B

Battery power supply

Always

11 to 14 V

E29-18 (IG) - E29-17 (E)

B - W-B

IG power supply

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

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

E29-39 (RSSI) - E29-17 (E)

L - W-B

Door control receiver output signal

Engine switch off, all doors closed and transmitter switch not pressed

11 to 14 V

Engine switch off, all doors closed and transmitter switch pressed

Below 1 V

E29-38 (RDA) - E29-17 (E)

LG - W-B

Door control receiver output signal

Engine switch off, all doors closed and transmitter switch not pressed → switch pressed → switch not pressed

4.6 to 5.4 V → Below 2 V → 4.6 to 5.4 V

E29-29 (RCO) - E29-17 (E)

B - W-B

Supply battery to door control receiver

Engine switch off, all doors closed and transmitter switch pressed

4.6 to 5.4 V

E29-21 (BZR) - Body ground

LG - Body ground

Wireless door lock buzzer output

Wireless door lock buzzer ON

11 to 14 V

E29-21 (BZR) - Body ground

LG - Body ground

Wireless door lock buzzer output

Wireless door lock buzzer OFF

Below 1 V

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

3. CHECK DOOR CONTROL RECEIVER



(a) Disconnect the L21 receiver connector.

(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

L21-1 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

L21-4 (+5) - Body ground

B - Body ground

Battery power supply

Always

4.6 to 5.4 V

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

4. CHECK POWER BACK DOOR UNIT (w/ Power Back Door System)



(a) Disconnect the L36 unit connector.

(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

L36-11 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

L36-10 (ECUB) - Body ground

R - Body ground

Battery power supply

Always

11 to 14 V

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

(c) Reconnect the L36 unit connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

L36-26 (BZR+) - Body ground

L - Body ground

Power back door warning buzzer signal

Back door warning buzzer is sounding

11 to 14 V

(pulse generation)

L36-26 (BZR+) - Body ground

L - Body ground

Power back door warning buzzer signal

Back door warning buzzer is stopped

Below 1 V

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