Home › Vehicle Interior › Theft Deterrent/Keyless Entry › SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)
Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000000XEW02LX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DESCRIPTION (2008 LX570)

DTC

B2284

Brake Signal Malfunction

DESCRIPTION

This DTC is stored when there is an inconsistency between the circuit between the main body ECU and stop light switch, and the CAN communication signal between the main body ECU and ECM.

DTC Code

Detection Condition

Trouble Area

B2284

The circuit between the main body ECU and stop light switch, and the CAN communication signal between the main body ECU and ECM are inconsistent.
  • Main body ECU
  • Stop light switch
  • STOP fuse
  • Harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Use the Data List to check if the stop light switch is functioning properly.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light SW

Stop light switch/ON or OFF

ON: Brake pedal depressed

OFF: Brake pedal released

-

Result

Result

Proceed to

Display on the Techstream does not change according to brake pedal operation

A

Display on the Techstream changes according to brake pedal operation

B
A

2.

INSPECT FUSE (STOP)

(a) Remove the STOP fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

STOP fuse

Always

Below 1 Ω
OK

3.

INSPECT STOP LIGHT SWITCH ASSEMBLY


(a) Disconnect the A30 stop light switch connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - 2

Stop light switch pin not pushed

Below 1 Ω

3 - 4

Stop light switch pin pushed

Below 1 Ω

1 - 2

Stop light switch pin pushed

10 kΩ or higher

3 - 4

Stop light switch pin not pushed

10 kΩ or higher
OK

4.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY AND MAIN BODY ECU)


(a) Disconnect the 2B main body ECU connector.

(b) Disconnect the A30 stop light switch connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A30-2 - Body ground

Always

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

2B-22 (STP) - A30-1

Always

Below 1 Ω

2B-22 (STP) or A30-1 - Body ground

Always

10 kΩ or higher
OK