what does code B1242 mean in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, and a basic toolset.
• Ensure the vehicle is parked on a flat surface and the ignition is turned off.

2. Battery Inspection

• Sub-step 1: Disconnect the negative terminal of the battery to prevent electrical shock.
• Sub-step 2: Use a multimeter to check the battery voltage; replace the battery if voltage is below 12.4V.
• Sub-step 3: Reconnect the battery terminal securely after testing.

3. Fuse Check

• Sub-step 1: Locate the fuse box (typically under the dashboard or in the engine compartment).
• Sub-step 2: Identify and remove the fuses related to the interior lighting system.
• Sub-step 3: Inspect each fuse for continuity; replace any blown fuses with the same amperage rating.

4. Wiring and Connector Inspection

• Sub-step 1: Visually inspect the wiring harness connected to the interior lighting control module for signs of wear, fraying, or corrosion.
• Sub-step 2: If damage is found, repair or replace the affected wiring or connectors.

5. Control Module Testing

• Sub-step 1: Using the multimeter, check the power and ground connections at the interior lighting control module.
• Sub-step 2: If there is no power or ground, trace the wiring back to the source to find the interruption.
• Sub-step 3: If all connections are intact, consider replacing the interior lighting control module.