Lexus ES: Lost Communication with Blind Spot Monitor Master Module (U0233)
DESCRIPTION
This DTC is stored when the blind spot monitor sensor LH judges that there is a communication problem with the blind spot monitor sensor RH.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U0233 | Lost Communication with Blind Spot Monitor Master Module | The blind spot monitor sensor (slave) cannot receive signals from the blind spot monitor sensor (master) |
|
CAUTION / NOTICE / HINT
NOTICE:
When checking for DTCs, make sure that the blind spot monitor system is turned on.
HINT:
- Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
| 1. | CHECK DTC OUTPUT |
(a) Turn the engine switch off.
(b) Turn the engine switch on (IG).
(c) Clear the DTCs.
Body Electrical > Blind Spot Monitor Slave > Clear DTCs(d) Check for DTCs.
Body Electrical > Blind Spot Monitor Slave > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U0233 is output | A |
| No DTCs are output | B |
| B |  | USE SIMULATION METHOD TO CHECK |
|
| 2. | REPLACE BLIND SPOT MONITOR SENSOR RH |
Click here .gif)
|
| 3. | CHECK DTC OUTPUT |
(a) Check for DTCs.
Body Electrical > Blind Spot Monitor Slave > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U0233 is output | A |
| No DTCs are output | B |
| A | | REPLACE BLIND SPOT MONITOR SENSOR LH |
| B | | END (BLIND SPOT MONITOR SENSOR RH WAS DEFECTIVE) |
READ NEXT:
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 DT
Vehicle Speed Sensor (C1A45)
DESCRIPTION The blind spot monitor sensor receives vehicle speed signals from the skid control ECU via CAN communication. Blind Spot Monitor Master DTC No. Detection Item DTC Detection Conditio
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the blind spot monitor system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT: If there are any scratches or impact marks on th
Extension Module Malfunction 2 (B1556)
DESCRIPTION This DTC is stored when a malfunction occurs in the Navigation ECU. DTC No. Detection Item DTC Detection Condition Trouble Area B1556 Extension Module Malfunction 2 When any of the following conditions is met:
Internal power supply malfunction
Internal hard drive ma
