Home › Vehicle Interior › Theft Deterrent/Keyless Entry › SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function)
Last Modified: 11-27-2007 1.6 J
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000002CLW00AX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): DESCRIPTION (2008 LX570)

Back Door Entry Unlock Function does not Operate

DESCRIPTION

When the back door opener switch is turned on, the certification ECU (smart key ECU assembly) uses the electrical key antenna (for outside luggage compartment) to output a request signal to the outside of the vehicle for a distance of approximately 1.0 m (3.28 ft.) from the back door. A key near the back door detects this request and transmits its ID code. The door control receiver receives the ID code and sends this ID code to the certification ECU (smart key ECU assembly). The certification ECU (smart key ECU assembly) checks if the ID code is valid. When the ID code is valid, the certification ECU (smart key ECU assembly) sends a back door open signal to the main body ECU using the CAN communication line and stops outputting request signals. The main body ECU then unlocks the back door.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Before performing the inspection, check that there are no problems related to the "CAN Communication System" and "LIN Communication System".

PROCEDURE

1.

CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch of the master switch assembly is operated, check that the locked doors unlock.

OK:

Door locks operate normally.

OK

2.

CHECK VEHICLE EQUIPMENT

(a) Check if the power back door is equipped on the vehicle.

Result

Result

Proceed to

w/ Power Back Door System

A

w/o Power Back Door System

B
A

3.

CHECK POWER BACK DOOR OPERATION

(a) When the power back door switch is operated, check that the power back door opens.

OK:

Power back door is open.

OK

4.

READ VALUE USING TECHSTREAM (BACK DOOR HANDLE SW)

(a) Using the Techstream, read the Data List.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Handle SW

Back door opener switch / ON or OFF

ON: Back door opener switch pushed

OFF: Back door opener switch not pushed

-

OK:

"ON" (switch is pushed) and "OFF" (switch is not pushed) appears on the screen.

OK

5.

CHECK BACK DOOR OPENER SWITCH

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (UL) - 2 (L)

3 (B) - 2 (L)

Not pushed

10 kΩ or higher

1 (UL) - 2 (L)

Lock switch pushed

Below 1 Ω

3 (B) - 2 (L)

Open switch pushed

Below 1 Ω
OK

6.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BACK DOOR OPENER SWITCH)


(a) Disconnect the E1 ECU connector.

(b) Disconnect the S7 switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E1-26 (BDSU) - S7-3 (B)

Always

Below 1 Ω

E1-26 (BDSU) or S7-3 (B) - Body ground

Always

10 kΩ or higher
OK