Lexus ES: Air Conditioner ECU Vehicle Information Reading/Writing Processor Malfunction (B15F5)
DESCRIPTION
This DTC is stored when items controlled by the air conditioning amplifier assembly cannot be customized via the navigation system vehicle customization screen.
HINT:
The air conditioning amplifier assembly controls the air conditioning system related items that are customizable via the multi-display assembly screen.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B15F5 | Air Conditioner ECU Vehicle Information Reading/Writing Processor Malfunction | Air conditioning amplifier assembly 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.
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 AIR CONDITIONING SYSTEM |
(a) Check if the air conditioning system is malfunctioning.
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HINT:
Customization may not be possible depending on the malfunction in the air conditioning system.
OK:
No malfunctions are present in the air conditioning system.
| NG | | GO TO AIR CONDITIONING SYSTEM |
|
| 3. | CHECK CUSTOMIZE ITEMS |
(a) Display the "Vehicle Customization" screen.
(b) Make a note of the customizable items for the air conditioning system.
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 air conditioning system 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 AIR CONDITIONING AMPLIFIER ASSEMBLY |
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SEE MORE:
Disassembly
DISASSEMBLY PROCEDURE 1. SEPARATE FRONT NO. 2 AXLE INBOARD JOINT BOOT CLAMP (a) Secure the drive shaft in a vise between aluminum plates. NOTICE: Do not overtighten the vise. (b) Using pliers, separate the front No. 2 axle inboard joint boot clamp as shown in the illustration. 2. SEPA
System Diagram
SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Skid control ECU (brake actuator assembly) Steering angle sensor Steering angle sensor request signal CAN communication line Steering angle sensor Skid control ECU (brake actuator a
