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How can I troubleshoot the adaptive cruise control not functioning in a 2019 Toyota Camry? - Toyota Camry
Home/Cars/Toyota/Camry/Eighth Generation (2018-present)/How can I troubleshoot the adaptive cruise control not functioning in a 2019 Toyota Camry?

How can I troubleshoot the adaptive cruise control not functioning in a 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
643 words

Problem Statement

Learn how to troubleshoot and fix adaptive cruise control issues in a 2019 Toyota Camry with step-by-step diagnostic and repair instructions.

Affected Component
Adaptive Cruise Control System
Estimated Time
2-4 hours

Symptoms

  • •Adaptive Cruise Control system warning light is illuminated on the dashboard.
  • •The ACC cannot be engaged.
  • •The vehicle does not maintain speed or adjust to traffic conditions.
  • •The dashboard displays error messages related to the ACC.

Diagnostic Steps

  1. 1
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  4. 4
  5. 5
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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
  • •Cleaning cloth
  • •Screwdriver
  • •Socket set
  • •Torque wrench

Additional Information

Affected Component
Adaptive Cruise Control System
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation
Troubleshooting Adaptive Cruise Control (ACC) Not Functioning in a 2019 Toyota Camry (XV70)

Step 1: Preliminary Checks

  1. Check for Dashboard Warnings

    • Turn on the ignition without starting the engine and check for warning lights on the dashboard. Note any lights related to the ACC or the brake system.

  2. Inspect the Windshield

    • Ensure the windshield is clear of obstructions where the radar sensor is located (typically behind the rearview mirror). Look for dirt, ice, or damage.

Step 2: Check System Settings

  1. Ensure the ACC is Activated

    • Make sure that the ACC is activated via the vehicle’s settings. Refer to the owner's manual for specific instructions.

  2. Verify Brake System Status

    • Check if the brake pedal feels normal and does not have any sponginess. The ACC system may be disabled if there is an issue with the brake system.

Step 3: Scan for Diagnostic Trouble Codes (DTCs)

  1. Tools Required

    • OBD-II Scanner

  2. Procedure

    • Connect the OBD-II scanner to the vehicle’s diagnostic port (usually under the dashboard).
    • Turn the ignition to the "ON" position without starting the engine.
    • Retrieve any stored DTCs related to the ACC, the braking system, or the vehicle’s electronics. Take note of any codes.
Common DTCs to Look For:
  • C1201 - Vehicle Speed Sensor Malfunction
  • C1411 - Brake Pressure Sensor Malfunction
  • C1A10 - Radar Sensor Malfunction
Step 4: Visual Inspection

  1. Inspect Radar Sensor

    • Check the radar sensor located behind the front grille. Ensure it is free from debris and not misaligned. If it is damaged or blocked, it may need to be replaced.

  2. Check Wiring and Connectors

    • Inspect the wiring harness connected to the radar sensor for any damage, fraying, or corrosion. Ensure all connectors are securely seated.

  3. Brake System Inspection

    • Check the brake fluid level in the reservoir. If low, top off with the appropriate brake fluid.
    • Inspect brake pads for wear, as worn pads can affect ACC functionality.
Repair Instructions

Repair Option 1: Clean or Reposition Radar Sensor

  1. Tools Required

    • Cleaning cloth
    • Screwdriver (if necessary for repositioning)

  2. Procedure

    • Clean the radar sensor area with a microfiber cloth to remove any dirt or debris.
    • If the sensor appears misaligned, carefully adjust it back into position.

Repair Option 2: Replace Radar Sensor

  1. Tools Required

    • Socket set
    • Torque wrench
    • New radar sensor (if needed)

  2. Procedure

    • Disconnect the battery to prevent any electrical shorts.
    • Remove the front grille (if necessary) to access the radar sensor.
    • Unplug the sensor connector and remove the bolts securing the sensor.
    • Install the new sensor, ensuring it is aligned correctly, and torque the bolts to specifications.
    • Reconnect the sensor and the battery.

Repair Option 3: Address DTCs

  1. Tools Required

    • OBD-II Scanner
    • Repair manual for specific troubleshooting

  2. Procedure

    • For any DTCs retrieved, follow the manufacturer’s service manual to diagnose and repair the underlying issue (e.g., replacing a faulty brake sensor, repairing wiring).
Step 5: Test the System
  1. Recheck the System
    • After any repairs, clear the DTCs with the OBD-II scanner.
    • Start the vehicle and check if the ACC warning light remains off.
    • Test the ACC functionality in a safe driving environment.
Conclusion

If the adaptive cruise control system is still not functioning after performing the above steps, it may require further diagnosis by a professional technician or a visit to a Toyota dealership for advanced diagnostics.