Does C1B52 mean my right rear radar has failed?

No. On the Nissan Leaf, C1B52 points to the right BSW/BSI indicator circuit showing an open condition. The radar module reports the problem because it monitors that circuit. Prove power, ground, and the indicator output path first. Use a command test to toggle the indicator and measure voltage drop under load.

What does “circuit voltage above threshold” indicate on an open circuit?

It usually indicates the circuit lost its intended load or return path. With an open, the driver circuit can float high or read as high voltage through internal pull-ups. That fits the SAE J2012-DA FTB -17 open-circuit logic. Confirm by checking continuity end-to-end and by load-testing the circuit, not only with an ohmmeter.

Can my scan tool still communicate with the Right rear side radar, and why does it matter?

Most of the time, yes. If the scan tool communicates normally, the module has power, ground, and basic network integrity. That supports a local indicator circuit fault instead of a dead module. If you cannot communicate, shift to power/ground checks and network diagnosis first. A non-communicating module can trigger multiple secondary warnings and mislead diagnosis.

Will I need calibration or initialization after repairing C1B52?

Sometimes. If you only repair wiring or the indicator lamp, calibration usually is not required. If you replace the Right rear side radar or disturb its mounting position, Nissan typically requires an initialization and, on some platforms, a radar aiming or calibration routine. Use a capable scan tool with Nissan ADAS functions and follow service information for the Leaf.

How do I confirm the repair is complete and the code will not come back?

After repairs, clear DTCs and run the system’s self-check. Then command the right BSW/BSI indicator ON and OFF with bi-directional controls and verify stable operation. Drive the Leaf until the radar completes its enable criteria and self-test. Those criteria vary by Nissan platform and conditions. Confirm the code stays cleared and no pending faults return.

C1B52 Nissan – Right blind spot warning (BSW)/blind spot

C1109 Battery voltage
C1145 Yaw rate sensor
C1705 Low pressure (right front)
C1706 Low pressure (right rear)
C1707 Low pressure (left rear)
C1A16 Radar stain (Component or system operation obstructed or blocked)
C1B00 Camera unit malf
C1B40 Side radar (right) fault

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