Diagnosis System [08/2013 - ]
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- DESCRIPTION
- The certification ECU (smart key ECU assembly) and power management control ECU control the vehicle immobiliser system functions. Immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).
In some cases, a malfunction may be occurring in the immobiliser system even though the security indicator light is not illuminated.
When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
- The certification ECU (smart key ECU assembly) and power management control ECU control the vehicle immobiliser system functions. Immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).
- CHECK DLC3
- Check the DLC3. Refer to GENERAL INFORMATION [08/2013 - ] .
- INSPECT AUXILIARY BATTERY VOLTAGE
- Measure the auxiliary battery voltage with the power switch off.
Standard Voltage
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery.
- Measure the auxiliary battery voltage with the power switch off.
- START FUNCTION PROBLEM SYMPTOMS
Symptom Suspected Area Component Malfunction Possible Output DTCs Related Data List Item Hybrid control system cannot be started*1 Certification ECU (smart key ECU assembly) Open or short circuit inside ECU - B278A
- B2790
- Ignition Switch
- #Codes
- Immobilizer when IG=ON
- Immobiliser
- Master Key
- Sub Key
- BCC Malfunction
- Abnormal Status
- Different Encrypt Code
- Different Serial Number
- Frame Error
- Response
- Wireless Starter Com ID
- Wireless C Code
- Engine Start Condition
- ID-BOX Sleep Condition
- ID-BOX Start Condition
- Engine Start Request
- 3bit Code Request
- S Code Check
- L Code Check
- Unlock Request Receive
- Lock Request Receive
- S Code Check (Past)
- L Code Check (Past)
- EFI Code Receive
- EFI Communication
Hybrid control system cannot be started*1 ID code box (immobiliser code ECU) Open or short circuit inside ECU - B278A
- B2799
- B279A
- Ignition Switch
- #Codes
- Immobilizer when IG=ON
- Immobiliser
- Master Key
- Sub Key
- BCC Malfunction
- Abnormal Status
- Different Encrypt Code
- Different Serial Number
- Frame Error
- Response
- Engine Start Condition
- ID-BOX Sleep Condition
- ID-BOX Start Condition
- Engine Start Request
- 3bit Code Request
- S Code Check
- L Code Check
- Unlock Request Receive
- Lock Request Receive
- S Code Check (Past)
- L Code Check (Past)
- EFI Code Receive
- EFI Communication
Power management control ECU Open or short circuit inside ECU - B2799
- B279A
- B279C
EFI Code Receive Hybrid control system Power management control ECU incompatible with installed immobiliser system B279C - Engine Start Condition
- EFI Code Receive
Power source mode cannot be changed*1 Power switch Open or short circuit inside switch B278A - Ignition Switch
- Unlock Request Receive
- Lock Request Receive
Power management control ECU Open or short circuit inside ECU - B2271
- B2274
- Ignition Switch
- Immobilizer when IG=ON
- Immobiliser
Steering lock lock/unlock not possible*2 Steering lock ECU (steering lock actuator assembly) - Open or short circuit inside ECU
- Actuator stuck
- B2781
- B2782
- B2788
- Unlock Request Receive
- Lock Request Receive
- *1: Refer to Problem Symptoms Table for Smart Access System with Push-button Start (for Start Function).
- *2: Refer to Problem Symptoms Table for Steering Lock System.