DTC U1236-87: Lost Communication with Cruise Control Front Distance Range Sensor Front Side "B" Missing Message [10/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus LS 500. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK CAN MAIN WIRE (FRONT SIDE RADAR SENSOR (B))
Pre-procedure1
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the A126 front side radar sensor (B) connector.
Procedure1
- Measure the resistance according to the value (s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A126-5 (CA2P) - A126-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω A126-5 (CA2P) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher A126-6 (CA2N) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher A126-5 (CA2P) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher A126-6 (CA2N) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 3
Result:
OK
See step 2
- CHECK FRONT SIDE RADAR SENSOR (B)
Pre-procedure1
- Disconnect the A127 front side radar sensor (A) connector.
Procedure1
- Measure the waveform according to the value (s) in the table below.
Standard
Tester Connection Condition Tool Setting Specified Condition A127-5 (CA2P) - A127-6 (CA2N) Ignition switch ON 1 V/DIV., 100 μs./DIV. Pulse generation Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE FRONT SIDE RADAR SENSOR (A). Refer to REMOVAL [10/2023 - ]
Result:
NG
REPLACE FRONT SIDE RADAR SENSOR (B). Refer to REMOVAL [10/2023 - ]
- Disconnect the A127 front side radar sensor (A) connector.
- CHECK CAN MAIN WIRE (FRONT SIDE RADAR SENSOR (A))
Pre-procedure1
- Disconnect the A127 front side radar sensor (A) connector.
Procedure1
- Measure the resistance according to the value (s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A127-5 (CA2P) - A127-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω A127-5 (CA2P) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher A127-6 (CA2N) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher A127-5 (CA2P) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher A127-6 (CA2N) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE FRONT SIDE RADAR SENSOR (A). Refer to REMOVAL [10/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Disconnect the A127 front side radar sensor (A) connector.