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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TIGHTEN BOLTS AND NUTS ON CHASSIS AND BODY
(a) If necessary, tighten the bolts and nuts on the chassis parts listed below.
Front axle and suspension
Drivetrain
Rear axle and suspension
Brake system
Engine mounts
Other chassis parts
(b) If necessary, tighten
