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Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000000XES01WX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DESCRIPTION (2008 LX570)

DTC

B2275

STSW Monitor Malfunction

DESCRIPTION

This DTC is stored when the engine start request signal circuit inside the main body ECU is open or shorted.

DTC Code

Detection Condition

Trouble Area

B2275

The engine start request signal circuit inside the main body ECU or other related circuit is malfunctioning.
  • Main body ECU
  • ECM
  • Harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK WHETHER DTC OUTPUT RECURS

(a) Clear the DTCs THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DTC CHECK / CLEAR (2008 LX570) .

(b) Depress the brake pedal with the engine switch on (IG), wait at least 15 seconds, and check whether DTC B2275 is output.

Result

Result

Proceed to

DTC B2275 output

A

No DTC output

B
A

2.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)


(a) Disconnect the E4 main body ECU connector.

(b) Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E4-4 (STSW) - A38-14 (STSW)

Always

Below 1 Ω

E4-4 (STSW) or A38-14 (STSW) - Body ground

Always

10 kΩ or higher
OK

3.

INSPECT MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)


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

HINT:

The voltage is generated at terminal STSW for 0.3 seconds when the engine cranks.

Standard Voltage:

Tester Connection

Condition

Specified Condition

E4-4 (STSW) - Body ground

Brake pedal depressed with shift lever in P, engine switch pushed once

11 to 14 V
OK