U111B – Side camera Right image signal (Nissan)

Nissan-specific code — factory diagnostic data

U111B means the Nissan Leaf lost a usable image signal from the right-side camera, so the 360-view or side view may glitch or go blank. In plain terms, the car cannot “see” correctly on that side, even if everything else drives fine. According to Nissan factory diagnostic data, this code indicates a problem with the Side camera Right image signal, as monitored by the AVM (Around View Monitor) system. This is a manufacturer-specific Nissan code, so the exact detection logic can vary by platform. Treat U111B as a direction to test the camera power, ground, and signal path before replacing parts.

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U111B Quick Answer

U111B on a Nissan Leaf points to the AVM detecting an invalid or missing right-side camera image signal. Most fixes involve wiring or connector faults at the camera, not a failed camera.

What Does U111B Mean?

Official definition: “Side camera Right image signal.” The AVM sets U111B when it cannot use the right-side camera image stream. In practice, the display may show a black screen, a frozen frame, heavy distortion, or a “camera unavailable” message for the right-side view. That matters because the AVM relies on that stream to build the surround image and to support parking visibility.

What the module checks: The AVM does not “measure voltage” for the picture itself. Modern Nissan camera systems carry the video as a high-speed digital stream (often LVDS, GMSL, FPD-Link, or a Nissan-proprietary serialized format). The AVM monitors whether it detects the camera and whether the incoming digital image stream stays valid over time. Why that matters: A DVOM can confirm power and ground, but it cannot prove video integrity. You must verify connector condition, harness continuity, and the AVM’s camera status data before condemning the camera.

Theory of Operation

Under normal operation, the right-side camera powers up when the AVM requests it. The camera then sends a continuous digital video stream to the AVM. The AVM processes the stream, applies any needed corrections, and sends the final image to the display. If the Leaf supports multiple views, the AVM blends images from several cameras to create a surround view.

U111B sets when the AVM stops receiving a valid right camera stream, or when the stream becomes unstable. Harness flex near the mirror or door area often triggers intermittent dropouts. Connector fretting and moisture also corrupt the signal. Because the video is digital and high-speed, small increases in resistance or shielding damage can break the image without blowing a fuse.

Symptoms

These symptoms usually show up when you select a camera view or shift into the conditions that wake the AVM.

• Scan tool AVM shows U111B stored or current, and may show the right camera as “Not Detected” or “Signal Error” in data.
• Right view right-side camera screen goes black, blue, or shows “no signal” style messaging.
• Intermittent image cuts in and out when you hit bumps or move the door/mirror.
• Distortion flicker, rolling lines, pixelation, or a frozen frame on the right-side image.
• AVM function around-view composite fails, shows a missing quadrant, or disables stitched view.
• Parking assist behavior parking guidance features may limit view selection or display warnings.
• Related DTCs companion AVM camera or communication codes may appear with U111B.

Common Causes

• Harness damage at flex/hinge points: Camera wiring at the right-side door, mirror, or adjacent harness runs flexes and develops opens or intermittent shorts.
• Connector fretting at camera body: Vibration and slight movement at the right side camera connector creates micro-arcing and high resistance that corrupts the digital image stream.
• Water intrusion at the right camera or connector: Moisture in the camera connector or splice area increases resistance and disrupts the image signal the AVM expects.
• Poor ground path for the right side camera: A loose ground point or corroded splice causes a voltage drop under load and the camera stops transmitting reliably.
• Power supply issue to the right side camera: A blown fuse, weak feed, or high resistance in the power circuit prevents stable camera operation and the AVM flags the signal.
• AVM connector pin fit or terminal damage: Spread terminals or corrosion at the AVM connector interrupts reception of the right camera image data.
• Receiver-side fault inside the AVM: The AVM may lose its ability to decode that camera’s stream, even when the camera and wiring test good.
• Aftermarket accessory wiring interference: Added equipment near mirror or door harness routing can pinch the camera harness or introduce noise and intermittent opens.
• Right side camera internal failure (less common): The camera’s internal electronics can fail and stop outputting a valid digital video stream.

Diagnosis Steps

Use a scan tool that can access Nissan AVM data and run camera status tests. Have a DVOM for power and ground checks, plus back-probes and a load tool. A scope helps for network checks, not for proving image quality. Remember: the camera signal is digital (LVDS/GMSL/serialized). A DVOM cannot validate stream integrity.

1. Confirm U111B in the AVM and record freeze frame data. Note ignition state, vehicle speed, system voltage, and any related AVM or camera DTCs. Freeze frame shows the conditions when the code set. Use a scan tool snapshot later to capture an intermittent drop during a wiggle test or drive.
2. Run a full network scan and verify the AVM appears online. If the scan tool cannot communicate with the AVM, diagnose AVM power, ground, and network first. Communication faults change the direction of testing.
3. Check fuses and power distribution that feed the AVM and the camera circuits. Do this before unplugging modules. A weak feed can pass a visual check and still fail under load.
4. Verify AVM power and ground with voltage-drop testing under load. Turn the system on so the AVM operates. Measure ground drop from AVM ground to battery negative. Keep it under 0.1V during operation. Also check power-side drop from battery positive to the AVM feed.
5. Use the scan tool AVM data list or self-test to view right side camera status. Look for items like “camera detected,” “image signal,” or “camera communication.” Compare to the left side camera status if available. This step tells you if the AVM sees the camera and if the stream looks valid to it.
6. Inspect the right side camera area and connector closely. Focus on pin fit, corrosion, water trails, and damaged seals. Do not ignore light green discoloration. That corrosion can disrupt a high-speed digital signal.
7. Inspect the harness route through the right-side flex area. Follow the harness through any hinge, grommet, or door-to-body pass-through. Look for cracked insulation, stretched conductors, or prior repairs. Flex-point damage commonly causes an intermittent U111B.
8. Check camera power and ground at the camera connector. Use a loaded test, not continuity alone. Command the camera system on and verify the feed stays stable. Perform a voltage-drop test on the camera ground while the camera should operate.
9. Wiggle test while watching live data and a scan tool snapshot. Manipulate the camera connector, the flex boot area, and the harness near clips. If camera status flips from OK to NG, isolate the exact spot. Repair the wiring or terminals that react to movement.
10. If power and ground test good and the harness passes inspection, isolate the fault direction. Check for terminal damage at the AVM connector for the right camera input. Confirm the connector locks and strain relief hold the harness. Repair pin fit issues before suspecting a module.
11. Only after circuit verification, consider camera or AVM hardware. Substitute a known-good right camera if you have access, or follow Nissan pinpoint tests for receiver verification. If camera replacement becomes the outcome, perform the required calibration. Nissan camera systems tied to driver assist features often require static targets and/or a dynamic drive cycle with the OEM scan tool. Skipping calibration leaves safety features unreliable.
12. Clear DTCs and confirm the repair. Run the AVM camera self-test and verify the right image displays consistently. Road test if needed and recheck for pending versus confirmed faults. A pending code can indicate an intermittent issue that needs more harness work.

Professional tip: Treat U111B as a “signal path” problem first. Digital camera links fail from tiny terminal issues that continuity tests miss. Use voltage-drop under load for power and ground. Use the AVM camera status screen to prove detection and streaming. If the code returns on key-on, expect a hard fault in power, ground, connector fit, or the camera itself.

Possible Fixes

• Repair harness damage in the right-side flex area: Restore conductor integrity and add proper strain relief so the repair survives repeated door movement.
• Clean, dry, and restore terminal pin fit: Correct fretting or corrosion at the right camera connector and apply the proper terminal service steps.
• Repair power or ground faults: Fix high resistance at splices, grounds, or fuse contacts confirmed by voltage-drop testing.
• Repair AVM connector terminal issues: Replace spread or damaged terminals and confirm proper locking and retention.
• Replace the right side camera only after circuit proof: If the camera fails detection with known-good power and ground, replace it and complete required Nissan calibration procedures.
• Replace or reprogram the AVM only after proving inputs: Confirm good camera, good wiring, and correct powers and grounds before condemning the receiver.

Can I Still Drive With U111B?

You can usually drive a Nissan Leaf with U111B because it targets the AVM right side camera image signal, not propulsion control. Expect reduced visibility support. The Around View Monitor image may drop out, freeze, or show a warning. Treat parking and tight maneuvers as higher risk. Use mirrors and direct shoulder checks only. Do not rely on the camera view for curb distance, cyclists, or pedestrians. If the display distracts you, disable the camera view and schedule diagnosis soon.

How Serious Is This Code?

U111B often starts as an inconvenience because the vehicle still drives normally. The seriousness rises when you depend on the right-side camera for close-range awareness. That includes parking, backing near obstacles, and merging near cyclists. This code does not prove the camera failed. It only tells you the AVM did not receive a valid right image signal. If any ADAS feature uses camera inputs on your Nissan platform, complete any required calibration after camera or module work. Skipping calibration can leave driver-assist functions inaccurate or disabled.

Common Misdiagnoses

Technicians often replace the right camera first because the complaint mentions “image signal.” That wastes money on Nissan systems more often than it fixes the fault. Digital video links use serialized signals, so a DVOM cannot validate signal quality. Another common mistake involves ignoring the flex area at the right door or mirror harness. Those wires fail from repeated movement and moisture. Many also clear codes without checking AVM live data for per-camera detection status. Finally, some chase CAN problems even though this DTC points to the camera image path into the AVM, not a generic network bus failure.

Most Likely Fix

The most common repair direction focuses on the signal path, not the camera unit. Start with the right camera connector and harness. Look for water intrusion, terminal spread, and fretting at the connector face. Next, inspect the harness where it flexes at moving panels. Repair damaged wiring, clean and tension terminals, and restore proper power and ground to the camera under load. If testing proves the camera does not stream video when powered and grounded, replace the camera and complete any Nissan-required calibration or initialization afterward.

Repair Costs

Network and communication fault repairs vary by root cause — wiring/connectors are often the source, but module-level repairs or replacements can be significantly more expensive.

Last updated: April 10, 2026

Definition source: Nissan factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.