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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: RM0000021SW007X
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): DESCRIPTION (2008 LX570)

Back Door Entry Lock Function does not Operate

DESCRIPTION

If the back door entry lock function does not operate but the back door open function operates, the communication line between the vehicle and electrical key transmitter is normal. The part of fault may be, the entry lock switch circuit (certification ECU (smart key ECU assembly) → back door opener switch).

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 closes.

OK:

Power back door is closes.

OK

4.

READ VALUE USING TECHSTREAM (BACK DOOR LOCK SWITCH)

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

Smart Access

Tester Display

Measurement Item/Display

Normal Condition

Diagnostic Note

Tr/B-Door Lock SW

Back door lock switch / ON or OFF

ON: Back door lock switch pushed

OFF: Back door lock 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

Condition

Specified Condition

1 (UL) - 2 (L)

Lock switch pushed

Below 1 Ω

1 (UL) - 2 (L)

Lock switch not pushed

10 kΩ or higher
OK

6.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - BACK DOOR OPENER SWITCH)

(a) Disconnect the E29 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

E29-7 (TSW5) - S7-1 (UL)

Always

Below 1 Ω

E29-7 (TSW5) - Body ground

Always

10 kΩ or higher
OK