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Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Supplemental Restraint Systems
Model Year: 2008 Model: LX570 Doc ID: RM000003FE6000X
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: DESCRIPTION (2008 LX570)

DTC

B2059

Vehicle Speed Malfunction

DESCRIPTION

The seat belt control ECU receives vehicle speed information from the ECM and master cylinder solenoid (skid control ECU) via CAN communication.

The ECM receives vehicle speed information from the master cylinder solenoid (skid control ECU) through the combination meter.

This DTC is stored when there is a difference in the vehicle speed information from the ECM and master cylinder solenoid (skid control ECU).

DTC Code

DTC Detection Condition

Trouble Area

B2059

The vehicle speed information from the ECM and the vehicle speed information from the master cylinder solenoid (skid control ECU) are different.
  • Combination meter
  • ECM
  • Master cylinder solenoid (skid control ECU)
  • Seat belt control ECU
  • Distance control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Using the Techstream, enter the following menus: Body Electrical / Combination Meter / Data List.

Combination Meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed/

Min.: 0 km/h (0 mph)

Max.: 255 km/h (158 mph)

Almost same as actual speed (when driving)

The speed is indicated on the speedometer.

(b) Read the value displayed on the Techstream.

OK:

Vehicle speed displayed on the Techstream is almost the same as actual vehicle speed measured using speedometer tester (calibrated chassis dynamometer).

OK

2.

CHECK DTC (MALFUNCTION IN CAN COMMUNICATION SYSTEM WITH ECM)

(a) Using the Techstream, clear the DTCs PRE-COLLISION: PRE-COLLISION SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(b) Check for DTCs PRE-COLLISION: PRE-COLLISION SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

Result

Result

Proceed to

DTC is not output

A

CAN communication system DTCs (U0073, U0100, U0122, U0126) are output

B

Pre-collision system DTC B2059 is output

C
A