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: RM000000XUI01JX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): DESCRIPTION (2008 LX570)

Rear Door RH Entry Lock and Unlock Functions do not Operate

DESCRIPTION

When the passenger side rear door entry lock and unlock functions do not operate, one of the following may be malfunctioning: 1) power door lock system, 2) passenger side rear 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

Pr-Door Touch Sensor

Passenger side rear door touch sensor / ON or OFF

ON: Touch sensor touched

OFF: Touch sensor not touched

Pr-Door Trigger Switch

Passenger side rear 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 passenger side rear door outside handle, and perform a passenger side rear 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 passenger side rear 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 (passenger side rear 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 + Passenger Side Rear.

(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 passenger side rear 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 E30 ECU connector.

(b) Disconnect the z26 oscillator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E30-2 (SEL4) - z26-4 (SEL)	Always	Below 1 Ω
E30-11 (CG4B) - z26-5 (CLGB)	Always	Below 1 Ω
E30-2 (SEL4) - Body ground	Always	10 kΩ or higher
E30-11 (CG4B) - Body ground	Always	10 kΩ or higher

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

(a) Disconnect the z25 handle connector.

(b) Disconnect the z26 oscillator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z25-2 (ANT2) - z26-8 (ANT2)	Always	Below 1 Ω
z25-5 (ANT1) - z26-3 (ANT1)	Always	Below 1 Ω
z25-2 (ANT2) - Body ground	Always	10 kΩ or higher
z25-5 (ANT1) - Body ground	Always	10 kΩ or higher

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

(a) Disconnect the z26 oscillator connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
z26-1 (B) - z26-7 (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.