Lexus ES: D-Seat ECU Vehicle Information Reading/Writing Process Malfunction (B15F8)
DESCRIPTION
This DTC is stored when items controlled by the main body ECU (multiplex network body ECU) cannot be customized via the navigation system vehicle customization screen.
HINT:
The main body ECU (multiplex network body ECU) controls the front power seat control system (w/ Memory) related items that are customizable via the multi-display assembly screen.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B15F8 | D-Seat ECU Vehicle Information Reading/Writing Process Malfunction | Main body ECU (multiplex network body ECU) vehicle setting processing malfunction |
|
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.
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-
When replacing the radio receiver assembly, always replace it with a new one. If a radio receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio receiver assembly may not operate normally.
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
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OK:
CAN communication DTCs are not output.
| NG |  | GO TO CAN COMMUNICATION SYSTEM |
|
| 2. | CHECK FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) |
(a) Check if the front power seat control system (w/ Memory) is malfunctioning.
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HINT:
Customization may not be possible depending on the malfunction in the front power seat control system (w/ Memory).
OK:
No malfunctions are present in the front power seat control system (w/ Memory).
| NG | | GO TO FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) |
|
| 3. | CHECK CUSTOMIZE ITEMS |
(a) Display the "Vehicle Customization" screen.
(b) Make a note of the customizable items for each main body ECU (multiplex network body ECU).
HINT:
The items shown as customizable via the navigation system vehicle customization screen can also be changed using the Techstream. In the following step, the Techstream will be used.
(1) To match-up the items on the multi-display assembly with the items on the Techstream, check the customize parameters list for the front power seat control system (w/ Memory) related items that can be customized via the multi-display assembly screen.
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(c) Using the Techstream, check that it is possible to change the settings of the customize parameters that are available for customization via the multi-display assembly screen.
OK:
The items available for customization via the multi-display assembly screen can be customized successfully using the Techstream.
| OK | | REPLACE RADIO RECEIVER ASSEMBLY |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
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SEE MORE:
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
RSA (Road Sign Assist)
The RSA system recognizes specific
road signs using the front camera
to provide information to the
driver via the display.
If the system judges that the vehicle
is being driven over the speed limit,
performing prohibited actions, etc.
in relation to the recognized road
signs, it alerts t
