How can I resolve problems with the remote start system in my Toyota Camry XV70?

Toyota Camry XV70 (2018-2024)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0685, B2799

3 min read

553 words

Problem Statement

Learn how to diagnose and repair remote start system issues in your Toyota Camry XV70. Follow these steps to troubleshoot and fix common problems.

Error Code

P0685, B2799

Affected Component

Remote Start System

Estimated Time

2-3 hours

Symptoms

•Remote start button does not respond when pressed.
•Engine starts momentarily and shuts off.
•Remote start works intermittently.
•Indicator lights on the dashboard do not illuminate.
•Remote start works only within a short distance.

Diagnostic Steps

1
Check the Battery of the Key Fob
2
Inspect the Vehicle's Battery and Electrical System
3
Check for DTCs (Diagnostic Trouble Codes)
4
Inspect the Remote Start System Components
5
Test the Remote Start Signal

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

•Digital Multimeter
•OBD-II Scanner
•Remote Key Fob
•Battery Tester
•Screwdrivers (Phillips and Flathead)
•Torque Wrench
•Scan Tool Software (if available)

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Solution

Remote Start System Problems in Toyota Camry XV70 (2018-2024)

Symptoms:

Remote start button does not respond when pressed.
Engine starts momentarily and shuts off.
Remote start works intermittently.
Indicator lights on the dashboard do not illuminate.
Remote start works only within a short distance.

Tools Required:

Digital Multimeter
OBD-II Scanner
Remote Key Fob
Battery Tester
Screwdrivers (Phillips and Flathead)
Torque Wrench
Scan Tool Software (if available)

Step 1: Check the Battery of the Key Fob

Remove the key fob battery using a small screwdriver or a coin.
Test the battery voltage using a multimeter. It should read around 3V for CR2032 batteries.
If the battery is low or dead, replace it with a new one.

Step 2: Inspect the Vehicle's Battery and Electrical System

Check the vehicle battery for proper voltage (should be around 12.6V).
Ensure the battery terminals are clean and tight.
If the vehicle battery is low, charge or replace it as necessary.

Step 3: Check for DTCs (Diagnostic Trouble Codes)

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Check for any stored trouble codes related to the remote start system. Look for codes such as P0685 (ECM Power Relay) or B2799 (Smart Key System Malfunction).
Document any codes and clear them. Test the remote start again to see if the issue persists.

Step 4: Inspect the Remote Start System Components

Open the hood and inspect the wiring harness connected to the remote start module (if equipped).
Look for any loose connections, frayed wires, or corrosion.
Inspect the remote start antenna module (if applicable) for proper placement and condition.

Step 5: Test the Remote Start Signal

Using the key fob, press the remote start button while standing outside the car.
Check if the LED indicator on the key fob lights up when pressed.
If no signal is indicated, try reprogramming the key fob (consult the owner’s manual for instructions).

Repair Instructions

Repairing or Replacing the Key Fob

If the key fob is confirmed faulty:
- Purchase a compatible replacement key fob.
- Program the new fob according to the manufacturer’s instructions (usually involves inserting the key in the ignition and turning it to the ON position while following specific button presses).

Addressing Electrical Issues

If the vehicle battery was faulty or connections were loose:
- Replace the battery or secure the connections.
- Test the remote start system again.

Repairing Wiring Issues

If you found any frayed or damaged wires:
- Use wire connectors or solder to repair damaged wires.
- Ensure all connections are insulated and secured.
- Test the remote start system after making repairs.

Resetting the Remote Start System

Disconnect the vehicle’s battery for about 10 minutes to reset the remote start system.
Reconnect the battery and test the remote start again.

Conclusion

After following these diagnostic and repair steps, your Toyota Camry XV70's remote start system should function properly. If problems persist, it may be necessary to consult a certified technician or visit a dealership for further diagnosis, as there may be more complex electronic issues at play.