Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Vehicles Speed Malfunction (B2624)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Suspension / Steering Column / Power Tilt And Power Telescopic Steering Column System / Vehicles Speed Malfunction (B2624)

DESCRIPTION

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems via CAN communication. Each ECU informs the other ECUs that it is connected to the network by sending a specified signal (periodic signal) onto the communication bus on a regular basis. The multiplex tilt and telescopic ECU receives vehicle speed signals from the combination meter assembly via the CAN communication bus to prevent improper operation of the auto away/return function while driving.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2624

Vehicles Speed Malfunction
  • The auto away function is disabled with the last vehicle speed signal (If the engine switch is turned off immediately after the vehicle comes to a sudden stop, the last vehicle speed signal may not be 0 km/h (0 mph).) of 10 km/h (6 mph) or more.
  • The vehicle speed signal is lost for 5 seconds or more and the auto away/return function is disabled.
  • CAN communication system
  • Meter / gauge system
  • Multiplex tilt and telescopic ECU

PROCEDURE

1.

CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs.

Click here

Body Electrical > Tilt&Telescopic > Trouble Codes

OK:

DTCs are not output.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

2.

READ VALUE USING TECHSTREAM (FREEZE SPEED INFO)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Check the vehicle speed signal on the Techstream.

(f) Enter the following menus: Body Electrical / Tilt & Telescopic / Data List.

Body Electrical > Tilt&Telescopic > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Freeze Speed Info

Vehicle speed data

Min.: 0 km/h (0 mph)

Max.: 255 km/h (158 mph)

Actual vehicle speed

-
Body Electrical > Tilt&Telescopic > Data List

Tester Display

Freeze Speed Info

Result

Proceed to

Values indicated on the Techstream are normal.

A

Values indicated on the Techstream are abnormal.

B

HINT:

A vehicle speed of 3 km/h (2 mph) or more may be displayed on the Techstream immediately after the vehicle comes to a sudden stop. This is caused by a delay in vehicle signal received via CAN communication and is not a malfunction.

A

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU

B

GO TO METER / GAUGE SYSTEM

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