how to fix B1242 code in Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, screwdriver set, wiring diagram (for reference).
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Solar Sensor

• Sub-steps:
  1. Remove the dashboard cover or panel to access the solar sensor.
  2. Disconnect the solar sensor's wiring connector.
  3. Visually inspect the sensor for any physical damage or debris.
  4. If damaged, replace the solar sensor with a new unit (OEM recommended).
  5. Reconnect the wiring harness to the new solar sensor.
  6. Reinstall the dashboard cover or panel securely.

3. Check Wiring and Connections

• Sub-steps:
  1. Inspect the wiring harness leading to the solar sensor for any signs of fraying or corrosion.
  2. Use a multimeter to check for continuity in the wires leading to the sensor.
  3. Repair or replace any damaged wires or connectors as necessary.
  4. Ensure all connections are secure and free from debris.

4. System Test

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the vehicle and turn on the air conditioning system.
  3. Monitor the operation of the air conditioning and check for proper temperature control.
  4. Use the OBD-II scanner to check for any reoccurring codes.