Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Vehicle Speed Signal Malfunction (B2282,B2283)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / Vehicle Speed Signal Malfunction (B2282,B2283)

DESCRIPTION

DTC B2282 is stored when the vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match.

DTC B2283 is stored when a malfunction in the vehicle speed sensor is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2282

Vehicle Speed Signal Malfunction

The vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match. (1-trip detection logic*)
  • AM2 fuse
  • Meter/gauge system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
  • Drive the vehicle at a vehicle speed of 25 km/h (16 mph) or more for 20 seconds, and then drive the vehicle at a vehicle speed of less than 5 km/h (3 mph) for 20 seconds.

B2283

Vehicle Speed Sensor Malfunction

Either of the of the following malfunctions is detected (a vehicle speed sensor malfunction is detected) (1-trip detection logic*):

  • Vehicle speed signal malfunction detection 1: Excessive deceleration is detected
  • Vehicle speed signal malfunction detection 2: Engine speed linked malfunction detected
  • AM2 fuse
  • Meter/gauge system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
DTC Output Confirmation Operation:
  • Run the engine at an engine speed of 2000 rpm or more for 300 seconds.
  • Drive the vehicle at a vehicle speed of 50 km/h (31 mph) or more for 10 seconds, and then drive the vehicle at a vehicle speed of less than 50 km/h (31 mph).
  • *: Only detected while a malfunction is present and the engine switch is on (IG).
Vehicle Condition and Fail-safe Function when Malfunction Detected

DTC Code

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

B2282
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle speed is 0 km/h (0 mph), there is no effect on vehicle behavior.
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle is moving, the engine switch cannot be turned from on (IG) to off.

-

B2283
  • The power source mode is changed to off (the engine is stopped) by pressing the engine switch while the vehicle is being driven.
  • With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine will not start.

Steering lock motor operation is prohibited.
Related Data List and Active Test Items

DTC No.

Data List and Active Test

B2282

B2283
Power Source Control
  • Vehicle Speed Signal
  • Engine Condition
  • Power Supply Condition
Starting Control
  • Engine Speed
Combination Meter
  • Vehicle Speed Meter

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart access system with push-button start (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart access system with push-button start (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart access system with push-button start (for Start Function) Precaution.

    Click here

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed

Min.: 0, Max.: 255

Almost same as actual vehicle speed (Speedometer tester)

-
Body Electrical > Combination Meter > Data List

Tester Display

Vehicle Speed Meter

HINT:

Using a speedometer tester, check the actual vehicle speed and the vehicle speed displayed on the Techstream.

OK:

Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester.

NG

GO TO METER / GAUGE SYSTEM (Speedometer Malfunction)

OK

2.

READ VALUE USING TECHSTREAM (VEHICLE SPEED SIGNAL)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

(b) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Signal

Vehicle being driven or stopped

Stop or Run

Stop: Vehicle stopped

Run: Vehicle being driven at 5 km/h (3 mph) or more

-
Body Electrical > Power Source Control > Data List

Tester Display

Vehicle Speed Signal

OK:

The Techstream display changes correctly in response to the vehicle condition.

OK

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

NG

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
OK

4.

CHECK HARNESS AND CONNECTOR (GROUND)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J41-19 (SPD) - J10-19 (+S)

Always

Below 1 Ω

J41-19 (SPD) or J10-19 (+S) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the J41 certification ECU (smart key ECU assembly) connector.

(b) Reconnect the J10 combination meter assembly connector.

(c) Using an oscilloscope, check the waveform.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

-

-

Tester Connection

Condition

Tool Setting

Specified Condition

J41-19 (SPD) - J41-18 (E)

Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)

5 V/DIV., 20 ms./DIV.

Pulse generation

HINT:

The wavelength becomes shorter as the vehicle speed increases.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO METER / GAUGE SYSTEM (Speed Signal Circuit)

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