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 power 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 power switch off.
(b) Turn the power 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 |
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|
| 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) |
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