Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Engine Immobiliser System Incorrect Assembly (B279C95)
DESCRIPTION
If an ECM that is incompatible with the immobiliser system is installed, the ECM will store this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B279C95 | Engine Immobiliser System Incorrect Assembly | An ECM that is incompatible with the immobiliser system is installed. (1-trip detection logic*) | ECM | - |
- *: Only detected while a malfunction is present.
| Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|
| Engine cannot be started | - |
| DTC No. | Data List and Active Test |
|---|---|
| B279C95 | - |
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 ECM, refer to Registration.
Click here
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- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
| 1. | REPLACE ECM |
(a) Temporarily replace the ECM with a new one.
Click here
|
| 2. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
|
| 3. | CHECK FOR DTC |
(a) Check for DTCs.
Powertrain > Engine > Trouble CodesOK:
B279C95 is not output.
| Result | Proceed to |
|---|---|
| DTC B279C95 is not output | A |
| DTC B279C95 is output | B |
| A | .gif) | END (ECM WAS DEFECTIVE) |
| B | | USE SIMULATION METHOD TO CHECK |
Engine Immobiliser System Circuit Short to Battery (B279A12)
DESCRIPTION If the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM will store this DTC. DTC No. Detection Item DTC Detection Condit ...
Security Indicator Light Does not Blink
DESCRIPTION
The certification ECU (smart key ECU assembly) blinks the security indicator light (radio receiver assembly) when the immobiliser is set (engine switch off).
The certification ECU (sm ...
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INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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