10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free L4 questions are organized by exam domain, so you can see how each part of the Advanced Driver Assistance Systems (ADAS) Specialist Certification Test blueprint is tested. Reveal the answer and explanation under each question.
Domain 1: General ADAS Service and Diagnosis 35% of exam
Question 1
An SUV intermittently displays both adaptive cruise control and automatic emergency braking unavailable messages. Recorded data from straight-line driving at 40 km/h show three wheel speeds holding between 39 and 41 km/h while the left-rear wheel speed drops to zero. At the same instant, the brake controller marks vehicle-motion data invalid. The forward camera and radar remain online with completed calibrations. Which diagnostic target best accounts for the combined symptoms?
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Correct answer: C - Left-rear wheel-speed sensor circuit or encoder.
Question 2
A steering-wheel vibration motor has a constant 12 V feed and a low-side PWM driver. During a bidirectional test commanding 30% ON duty, the control terminal measures approximately 0 V for 3 ms and 12 V for 7 ms in each cycle. A multimeter from that terminal to battery negative reads 8.4 V. Which interpretation correctly reconciles the scope trace with the meter reading?
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Correct answer: B - The driver waveform matches the commanded 30% ON duty.
Question 3
An ADAS controller resets when its outputs are activated. Battery voltage remains stable and controller current is within the specified range. With the controller connected and operating, the feed drops 0.08 V against a 0.20 V maximum; its ground terminal measures 1.10 V above battery negative against a 0.10 V maximum. An earlier, unloaded continuity check of the ground produced a beep. What fault do the loaded measurements demonstrate?
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Correct answer: A - High resistance in the controller ground return.
Domain 2: Camera-Based Systems Service and Diagnosis 25% of exam
Question 4
The right-side surround-view image intermittently turns black as the passenger door moves; the other camera views remain clear. On this vehicle, the right camera uses CAN for diagnostics and a separate coaxial cable for video. During the blackout, camera identification and diagnostic data remain available, and loaded power and ground checks pass. Where should testing concentrate before either the camera or display is condemned?
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Correct answer: D - The separate video cable and connectors through the door-hinge area.
Question 5
An active forward-camera video fault has been repaired without erasing its stored record. For this system, the video monitor operates at 11.0-15.0 V; five seconds of continuous valid video clears the active status, but not the history record. The camera-unavailable warning stays on whenever the video fault is active OR calibration is incomplete. Supply is now 13.2 V, video has been valid for eight seconds, and calibration still reads "learning." What combination of statuses should the technician expect?
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Correct answer: D - Video fault inactive; history retained; unavailable warning on.
Question 6
A painted parking line looks continuous in each individual camera view but breaks sideways at the front-right seam of the synthesized overhead image. The complaint began immediately after replacement of the right mirror camera. There are no video dropouts or communication faults. Which repair path fits this pattern?
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Correct answer: C - Check camera seating and mirror position, then perform surround-view calibration.
Domain 3: RADAR-Based Systems Service and Diagnosis 30% of exam
Question 7
A front fascia has been repaired after a minor collision. For this vehicle, refinishing in the radar-transmission area is permitted up to 300 micrometers, but filler repairs and removal of base plastic are prohibited there. An instrument suitable for plastic measures 280 micrometers of coating. The repair record shows that a crack directly in the radar path was filled. The sensor has no current DTCs. What is the correct disposition of the fascia?
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Correct answer: A - Replace the fascia with an approved component.
Question 8
The right blind-spot warning lamp never illuminates. The right rear-corner radar reports a valid vehicle in the correct detection zone, and its identification and configuration match the vehicle. This radar module directly drives the right mirror warning lamp. With the vehicle stationary, the module accepts a bidirectional lamp-ON command, but the lamp stays dark. Which part of the system now requires isolation?
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Correct answer: B - The right indicator driver, wiring, and lamp.
Question 9
An ADAS CAN network stops communicating whenever the right rear-radar branch is connected. Communication returns when that branch is disconnected from the backbone. With power removed, the branch harness is then isolated at both ends and the radar module is unplugged. Resistance between the two CAN conductors in the isolated harness is 0.4 ohm after meter-lead compensation. What has this second test established?
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Correct answer: D - A short between the branch harness's CAN conductors.
Domain 4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis 10% of exam
Question 10
After bumper refinishing, one rear ultrasonic channel repeatedly reports an object 0.18 m away in an otherwise clear test area. In the approved stationary test mode, its supply, ground, and digital communication pass. The acoustic test trace shows a normal transmit burst followed by unusually prolonged ring-down. An adjacent sensor tests normally with the same target. Which installation defect best explains the false near-object report?
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Correct answer: C - Paint bridging the sensor-to-bumper acoustic isolation gap.
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The full bank has 1,020 more L4 questions with explanations.