Lexus ES: Software Incompatibility with Body Control Module "B" (U1331)
DESCRIPTION
This DTC is stored when the destination information of the main body ECU (multiplex network body ECU) does not match that of the blind spot monitor sensors.
Blind Spot Monitor Master| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U1331 | Software Incompatibility with Body Control Module "B" | Destination information of the main body ECU and blind spot monitor sensor do not match |
|
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U1331 | Software Incompatibility with Body Control Module "B" | Destination information of the main body ECU and blind spot monitor sensor do not match |
|
CAUTION / NOTICE / HINT
NOTICE:
- When checking for DTCs, make sure that the blind spot monitor system is on.
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
See page xxx
PROCEDURE
| 1. | CONFIRM PART NUMBER (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Check the main body ECU (multiplex network body ECU) part number.
(1) Check if the part number of the main body ECU (multiplex network body ECU) installed on the vehicle is correct.
OK:
The part number is correct.
| NG |  | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
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|
| 2. | CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Blind Spot Monitor Master > Clear DTCs Body Electrical > Blind Spot Monitor Slave > Clear DTCs(b) Recheck for DTCs and check if the same DTC is output again.
Body Electrical > Blind Spot Monitor Master > Trouble Codes Body Electrical > Blind Spot Monitor Slave > Trouble Codes| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC U1331 is output ("Blind Spot Monitor Master") | B |
| DTC U1331 is output ("Blind Spot Monitor Slave") | C |
| A | | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE BLIND SPOT MONITOR SENSOR RH |
| C | | REPLACE BLIND SPOT MONITOR SENSOR LH |
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Components
COMPONENTS ILLUSTRATION *1 COWL SIDE TRIM BOARD LH *2 FRONT DOOR OPENING TRIM COVER LH *3 FRONT DOOR SCUFF PLATE LH *4 INSTRUMENT SIDE PANEL LH *5 LOWER INSTRUMENT PANEL FINI
Installation
INSTALLATION PROCEDURE 1. INSTALL NO. 1 CLEARANCE WARNING BUZZER (a) Connect the connector. (b) Engage the clamp to install the No. 1 clearance warning buzzer. 2. INSTALL LOWER INSTRUMENT PANEL FINISH
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Check Bus 4 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Symptom Trouble Area Resistance between terminals 22 (CA2H) and 7 (CA
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Back Door / Trouble Codes. Body Electrical > Back Door > Trouble Codes (e) Check for DTCs. Click here CLEAR DTC (
