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How can I troubleshoot the adaptive cruise control malfunction in my 2019 Toyota Camry? - Toyota Camry
Home/Cars/Toyota/Camry/Eighth Generation (2018-present)/How can I troubleshoot the adaptive cruise control malfunction in my 2019 Toyota Camry?

How can I troubleshoot the adaptive cruise control malfunction in my 2019 Toyota Camry?

Toyota Camry Eighth Generation (2018-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
641 words

Problem Statement

Learn how to troubleshoot and repair the adaptive cruise control malfunction in your 2019 Toyota Camry with step-by-step instructions and required tools.

Affected Component
adaptive cruise control system
Estimated Time
2-4 hours

Symptoms

  • •Adaptive cruise control warning light illuminated on the dashboard.
  • •System failure message displayed on the multi-information display (MID).
  • •Adaptive cruise control fails to engage or disengages unexpectedly.
  • •Vehicle does not maintain speed or fails to adjust speed based on traffic.

Diagnostic Steps

  1. 1
  2. 2
  3. 3

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Multimeter
  • •wiring diagrams for the cruise control system
  • •soft cloth
  • •mild cleaner
  • •basic hand tools
  • •calibration tool (if required)

Additional Information

Affected Component
adaptive cruise control system
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
7 items

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Troubleshooting Adaptive Cruise Control Malfunction in 2019 Toyota Camry

Symptoms:

  1. Adaptive cruise control warning light illuminated on the dashboard.
  2. System failure message displayed on the multi-information display (MID).
  3. Adaptive cruise control fails to engage or disengages unexpectedly.
  4. Vehicle does not maintain speed or fails to adjust speed based on traffic.

Step 1: Initial Check

  • Visual Inspection:
    • Inspect the front grille area for any obstructions or damage to the radar sensor. The adaptive cruise control system relies on a radar sensor located behind the Toyota emblem.
    • Make sure there are no cracks or dirt on the windshield, especially near the camera mounted at the top center of the windshield.

Step 2: Scan for Diagnostic Trouble Codes (DTCs)

  • Tools Required: OBD-II scanner
  • Instructions:
    1. Connect the OBD-II scanner to the vehicle's diagnostic port (usually located under the dashboard near the steering column).
    2. Turn the ignition to the ON position without starting the engine.
    3. Use the scanner to read any stored codes related to the adaptive cruise control system.
    4. Note any relevant codes (e.g., C1A00, C1A01) for further research.

Step 3: Check for Related Systems

  • Tools Required: Multimeter, wiring diagrams for the cruise control system
  • Instructions:
    1. Inspect the wiring harness and connectors leading to the radar sensor and camera for any signs of wear, corrosion, or disconnection.
    2. Using a multimeter, check the voltage and ground connections to ensure the radar sensor is receiving adequate power.
    3. Verify the operation of other related systems, such as Lane Departure Alert (LDA) and Pre-Collision System (PCS), as they may share components.
Repair Instructions

Step 1: Clean Radar Sensor

  • Tools Required: Soft cloth, mild cleaner
  • Instructions:
    1. Gently clean the radar sensor using a soft cloth and a mild cleaner to remove any dirt or debris.
    2. Ensure that the sensor is properly aligned and securely mounted.

Step 2: Reset Adaptive Cruise Control

  • Tools Required: OBD-II scanner
  • Instructions:
    1. If DTCs were found, clear the codes using the OBD-II scanner.
    2. Turn off the ignition and wait for 10 seconds.
    3. Start the vehicle and test the adaptive cruise control system to see if the issue persists.

Step 3: Replace Faulty Components

  • Tools Required: Basic hand tools, replacement parts (if necessary)
  • Instructions:
    1. If diagnostic codes indicate a specific faulty component (e.g., radar sensor or ECU), proceed with replacement.
    2. For radar sensor replacement:
      • Disconnect the negative battery terminal.
      • Remove the front grille as per vehicle service manual instructions.
      • Disconnect the radar sensor wiring harness.
      • Remove the sensor mounting bolts and replace the sensor.
      • Reconnect the wiring harness and reassemble the grille.
    3. For ECU (if applicable), follow manufacturer's procedures for reprogramming after replacement.

Step 4: Calibration of Radar Sensor

  • Tools Required: Calibration tool (if required), access to service manual
  • Instructions:
    1. After replacing the radar sensor, it may require calibration to ensure proper functioning.
    2. Follow the specific calibration procedure provided in the service manual or use a calibration tool if available.
    3. Perform a test drive to ensure the adaptive cruise control is functioning correctly.
Final Steps
  1. Test the System: After completing repairs, test the adaptive cruise control in a safe area to ensure it engages and disengages properly.
  2. Recheck for Codes: Use the OBD-II scanner again to confirm that no new codes are present after the repairs.
  3. Monitor Performance: Observe the system over the next few days for any signs of malfunction or warning lights.
Conclusion

If the adaptive cruise control system continues to malfunction after following these steps, it may be necessary to consult a certified Toyota technician or dealership for further diagnostics and repair.