Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: ID BOX EEPROM Malfunction (B2790)
DESCRIPTION
When an internal malfunction occurs in the ID code box (immobiliser code ECU), the certification ECU (smart key ECU assembly) stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B2790 | ID BOX EEPROM Malfunction | An internal malfunction occurs in the ID code box (immobiliser code ECU) (EEPROM access malfunction). (1 trip detection logic*) |
| DTC output confirmation operation:
|
- *: Only output while a malfunction is present.
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
| - |
| DTC No. | Data List and Active Test |
|---|---|
| B2790 | - |
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.
-
Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Registration.
Click here
.gif)
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
PROCEDURE
| 1. | REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Replace the ID code box (immobiliser code ECU) with a new one.
Click here
|
.gif)
| 2. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs
|
| 3. | REGISTER RECOGNITION CODE |
(a) Register the recognition code to the ECUs.
Click here
|
| 4. | REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID codes.
Click here
|
| 5. | CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs.
Body Electrical > Smart Access > Trouble CodesOK:
DTC B2790 is not output.
| OK | .gif) | END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Antenna Coil Open / Short (B2784)
DESCRIPTION When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is al ...
Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid (B279986)
DESCRIPTION If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC. DTC No. Detec ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Telephone And Gps Antenna (for Front Side): Components
COMPONENTS ILLUSTRATION *1 DEFROSTER NOZZLE ASSEMBLY *2 TELEPHONE AND GPS ANTENNA ASSEMBLY *3 TELEPHONE AND GPS ANTENNA ASSEMBLY WITH BRACKET *4 TELEPHONE AND GPS ANTENNA BRACKET ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Navigation System: "No GPS signal" mark is displayed
CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System. Click here PROCEDURE 1. CHECK CABIN (a) Check the cabin for a ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0141