THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Vehicle Interior	Section: Theft Deterrent/Keyless Entry
Model Year: 2008	Model: LX570	Doc ID: RM000000XUI01GX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): DESCRIPTION (2008 LX570)

Driver Side Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

When the driver side door entry lock and unlock functions do not operate, one of the following may be malfunctioning: 1) power door lock system, 2) driver side door electrical key oscillator, or 3) certification ECU (smart key ECU assembly).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK POWER DOOR LOCK OPERATION

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

OK:

Door locks operate normally.

2.	READ VALUE USING TECHSTREAM (TOUCH SENSOR, TRIGGER SWITCH)

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

Smart Access

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

D-Door Touch Sensor

Driver side door touch sensor / ON or OFF

ON: Touch sensor touched

OFF: Touch sensor not touched

D-Door Trigger Switch

Driver side door outside handle lock switch / ON or OFF

ON: Entry lock switch pushed

OFF: Entry lock switch not pushed

Result

Result	Proceed to
Display changes according to manual operation	A
Display does not change according to manual operation	B

3.	CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter near the driver side door outside handle, and perform a driver side door entry lock and unlock operation check.

NOTICE:

If the key is brought within 0.2 m (0.656 ft.) of the door handle, communication is not possible.

HINT:

When the electrical key transmitter is brought near the driver side door outside handle, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
If the operation check is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

Result

Result	Proceed to
Operation check fails	A
Operation check is normal	B

4.	PERFORM KEY DIAGNOSTIC MODE INSPECTION

(a) Diagnostic mode inspection (driver side door electrical key oscillator).

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Smart Access / Smart Communication Check / Overhead + Driver Side.

(5) When the electrical key transmitter is in the position shown in the illustration, check that the wireless door lock buzzer sounds.

HINT:

If the buzzer sounds, it can be determined that the driver seat outside transmitter is operating normally.

OK:

Wireless door lock buzzer sounds.

5.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DOOR ELECTRICAL KEY OSCILLATOR)

(a) Disconnect the E29 ECU connector.

(b) Disconnect the z24 oscillator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E29-5 (SEL1) - z24-4 (SEL)	Always	Below 1 Ω
E29-34 (CG1B) - z24-5 (CLGB)	Always	Below 1 Ω
E29-5 (SEL1) - Body ground	Always	10 kΩ or higher
E29-34 (CG1B) - Body ground	Always	10 kΩ or higher

6.	CHECK HARNESS AND CONNECTOR (DOOR ELECTRICAL KEY OSCILLATOR - FRONT DOOR OUTSIDE HANDLE)

(a) Disconnect the z23 handle connector.

(b) Disconnect the z24 oscillator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z23-2 (ANT2) - z24-8 (ANT2)	Always	Below 1 Ω
z23-5 (ANT1) - z24-3 (ANT1)	Always	Below 1 Ω
z23-2 (ANT2) - Body ground	Always	10 kΩ or higher
z23-5 (ANT1) - Body ground	Always	10 kΩ or higher

7.	CHECK HARNESS AND CONNECTOR (DOOR ELECTRICAL KEY OSCILLATOR - BATTERY AND BODY GROUND)

(a) Disconnect the z24 oscillator connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
z24-1 (B) - z24-7 (GND)	Always	11 to 14 V

8.	REPLACE DOOR ELECTRICAL KEY OSCILLATOR

(a) Replace the door electrical key oscillator .

9.	CHECK DOOR ELECTRICAL KEY OSCILLATOR OPERATION

(a) Check that the entry function operates normally.

OK:

Operates normally.