Home › Vehicle Interior › Theft Deterrent/Keyless Entry › SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function)
Last Modified: 11-27-2007 1.6 U
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000000XUA01RX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): TERMINALS OF ECU (2008 LX570)

TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)



(a) Disconnect the E29 ECU connector.

(b) Measure the resistance and voltage of the wire harness side connector.

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) - Body ground

B - Body ground

+B power supply

Always

11 to 14 V

E29-18 (IG) - Body ground

B - Body ground

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

E29-3 (TSW1) - E29-17 (E)

G - W-B

Door outside handle (driver side) lock switch signal

Switch released

10 kΩ or higher

Switch pressed in

Below 1 Ω

E29-4 (TSW2) - E29-17 (E)

BR - W-B

Door outside handle (front passenger side) lock switch signal

Switch released

10 kΩ or higher

Switch pressed in

Below 1 Ω

E30-25 (TSW3) - E29-17 (E)

G - W-B

Door outside handle (rear LH) lock switch signal

Switch released

10 kΩ or higher

Switch pressed in

Below 1 Ω

E30-26 (TSW4) - E29-17 (E)

G - W-B

Door outside handle (rear RH) lock switch signal

Switch released

10 kΩ or higher

Switch pressed in

Below 1 Ω

E29-7 (TSW5) - E29-17 (E)

L - W-B

Back door lock switch signal

Switch released

10 kΩ or higher

Switch pressed in

Below 1 Ω

If the result is not as specified, the wire harness side may have a malfunction.

(c) Reconnect the E29 ECU connector.

(d) Measure the voltage of the connector.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

E29-33 (CLG1) - E29-34 (CG1B)

L - W

Door electrical key oscillator (driver side) sensor signal

All doors closed, all doors locked and engine switch off

Alternating between 5 V and below 1 V

Door unlocked or door open

Below 1 V

E29-22 (SEN1) - E29-17 (E)

R - W-B

Touch sensor detection signal

Outside door handle touched

11 to 14 V

Outside door handle not touched

Below 1 V

E29-5 (SEL1) - E29-17 (E)

Y - W-B

Touch sensor activation control signal

Key at least 5 m (16.4 ft.) away from door

11 to 14 V

Key moved near outside door handle

Below 1 V

E29-35 (CLG2) - E29-36 (CG2B)

L - R

Door electrical key oscillator (front passenger side) sensor signal

All doors closed, all doors locked and engine switch off

Alternating between 5 V and below 1 V

Door unlocked or door open

Below 1 V

E29-23 (SEN2) - E29-17 (E)

R - W-B

Touch sensor detection signal

Outside door handle touched

11 to 14 V

Outside door handle not touched

Below 1 V

E29-6 (SEL2) - E29-17 (E)

Y - W-B

Touch sensor activation control signal

Key at least 5 m (16.4 ft.) away from door

11 to 14 V

Key moved near outside door handle

Below 1 V

E30-8 (CLG3) - E30-9 (CG3B)

L - W

Door electrical key oscillator (rear LH) sensor signal

All doors closed, all doors locked and engine switch off

Alternating between 5 V and below 1 V

Door unlocked or door open

Below 1 V

E30-28 (SEN3) - E29-17 (E)

R - W-B

Touch sensor detection signal

Outside door handle touched

11 to 14 V

Outside door handle not touched

Below 1 V

E30-1 (SEL3) - E29-17 (E)

Y - W-B

Touch sensor activation control signal

Key at least 5 m (16.4 ft.) away from door

11 to 14 V

Key moved near outside door handle

Below 1 V

E30-10 (CLG4) - E30-11 (CG4B)

L - W

Door electrical key oscillator (rear RH) sensor signal

All doors closed, all doors locked and engine switch off

Alternating between 5 V and below 1 V

Door unlocked or door open

Below 1 V

E30-27 (SEN4) - E29-17 (E)

R - W-B

Touch sensor detection signal

Outside door handle touched

11 to 14 V

Outside door handle not touched

Below 1 V

E30-2 (SEL4) - E29-17 (E)

Y - W-B

Touch sensor activation control signal

Key at least 5 m (16.4 ft.) away from door

11 to 14 V

Key moved near outside door handle

Below 1 V

E29-11 (CLG5) - E29-12 (CG5B)

SB - V

Indoor electrical key antenna (for front floor) sensor signal

30 seconds after driver side door opened and closed, engine switch off

Alternating between 5 V and below 1 V

Within 30 seconds after driver side door opened and closed, engine switch off

Below 1 V

E29-13 (CLG6) - E29-14 (CG6B)

R - SB

Indoor electrical key antenna (for rear floor) sensor signal

30 seconds after driver side door opened and closed, engine switch off

Alternating between 5 V and below 1 V

Within 30 seconds after driver side door opened and closed, engine switch off

Below 1 V

E29-15 (CLG7) - E29-16 (CG7B)

GR - W

Indoor electrical key antenna (for luggage compartment) sensor signal

30 seconds after driver side door opened and closed, engine switch off

Alternating between 5 V and below 1 V

Within 30 seconds after driver side door opened and closed, engine switch off

Below 1 V

E29-31 (CLG8) - E29-32 (CG8B)

G - GR

Back door electrical key antenna (for outside luggage compartment) sensor signal

Back door opener switch off

Alternating between 5 V and below 1 V

Back door opener switch on

Below 1 V

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

B - W-B

Door control receiver power source

None of key switches pressed → Any of key switches pressed

Below 1 V → 4.5 to 5.5 V → Below 1 V

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

L - W-B

Door control receiver electric wave existence signal

None of key switches pressed → Any of key switches pressed

11 to 14 V → Below 1 V

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

LG - W-B

Door control receiver data input signal

None of key switches pressed → Any of key switches pressed

11 to 14 V → Below 1 V

E29-21 (BZR) - E29-17 (E)

LG - W-B

Wireless door lock buzzer signal

Answer-back on

Pulse generation

Answer-back off

Below 1 V

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 E1, E2, E3, 2A, 2B and 2D ECU connectors.

(b) Measure the resistance and voltage of the wire harness side connectors.

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 (ALTB) - Body ground

B - Body ground

ALTB power supply

Always

11 to 14 V

2B-20 (BATB) - Body ground

L - Body ground

BATB power supply

Always

11 to 14 V

E1-6 (AM1) - Body ground

W - Body ground

AM1 power supply

Always

11 to 14 V

E2-1 (AM2) - Body ground

W - Body ground

AM2 power supply

Always

11 to 14 V

2A-1 (IG) - Body ground

B - Body ground

IG1 signal

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

2A-1 (ACC) - Body ground

B - Body ground

ACC signal

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

If the result is not as specified, the wire harness side may have a malfunction.

(c) Reconnect the E1, E2, E3, 2A, 2B and 2D 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)

E3-4 (HAZ) - Body ground

O - Body ground

Hazard warning light signal

Answer-back on

Below 1 V

Answer-back off

11 to 14 V

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 11 or 12)

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)

E1-26 (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

(p) Using an oscilloscope, check waveform 12.

Waveform 12 (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

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



(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

L36-10 (ECUB) - Body ground

R - Body ground

ECUB power supply

Always

11 to 14 V

L36-11 (GND) - Body ground

W-B - Body ground

Body 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 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

L36-2 (DC+) - L36-1 (DC-)

R - B

Power back door lock motor circuit

Back door lock motor is operating

11 to 14 V

L36-2 (DC+) - L36-1 (DC-)

R - B

Power back door lock motor circuit

Back door lock motor is stopped

Below 1 V

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