Lexus NX: Lost Communication with Blind Spot Monitor Slave Module (U0232)
DESCRIPTION
This DTC is stored when the blind spot monitor sensor LH judges that there is a communication error with the blind spot monitor sensor RH.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| U0232 | Lost Communication with Blind Spot Monitor Slave Module | The blind spot monitor sensor (master) cannot receive signals from the blind spot monitor sensor (slave) |
| - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When checking for DTCs, make sure that the blind spot monitor main switch (multi-function switch) is on.
- Inspect the fuses for circuits related to this system before performing the following procedure.
- Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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After turning the power switch off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery terminal
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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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 HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BATTERY AND BODY GROUND) |
| (a) Disconnect the blind spot monitor sensor RH connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| X1-10 (BRGD) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| X1-5 (BRB) - Body ground | Power switch on (IG) | 11 to 14 V |
| X1-5 (BRB) - Body ground | Power switch off | Below 1 V |
| NG | .gif) | REPAIR OR REPLACE CAN LINE OR CONNECTOR |
|
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| 2. | CHECK FOR OPEN OR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH) |
| (a) Disconnect the cable from the negative (-) auxiliary battery terminal. |
|
(b) Disconnect the blind spot monitor sensor LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| V1-1 (CA2P) - V1-6 (CA2N) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω |
| V1-1 (CA2P) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| V1-6 (CA2N) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| V1-1 (CA2P) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| V1-6 (CA2N) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| OK | | REPLACE BLIND SPOT MONITOR SENSOR LH |
|
| 3. | CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH) |
| (a) Disconnect the cable from the negative (-) auxiliary battery terminal. |
|
(b) Disconnect the blind spot monitor sensor RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| X1-1 (CA2P) - X1-6 (CA2N) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω |
| X1-1 (CA2P) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| X1-6 (CA2N) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| X1-1 (CA2P) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| X1-6 (CA2N) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| OK | | REPLACE BLIND SPOT MONITOR SENSOR RH |
| NG | | REPAIR OR REPLACE CAN LINE OR CONNECTOR |
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