how to diagnose B1291 code in Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Battery Inspection and Replacement (if needed)

• Sub-step 1: Inspect the battery terminals for corrosion. Clean them using a wire brush if necessary.
• Sub-step 2: If the battery voltage is low, charge the battery or replace it if it fails to hold a charge.
• Tools Required: Multimeter, wire brush, battery terminal cleaner.

3. Repairing Connections

• Sub-step 1: If any loose connections are found, secure them tightly.
• Sub-step 2: Replace any damaged wiring or connectors discovered during inspection.
• Tools Required: Basic hand tools (screwdrivers, pliers), wire connectors.

4. Airbag Control Module Testing

• Sub-step 1: Reconnect the battery and check for power at the airbag control module harness.
• Sub-step 2: If power is not present, trace the wiring back to the fuse box and check for any blown fuses related to the airbag system.
• Tools Required: Multimeter, wiring schematic for reference.

5. Clear Trouble Codes

• Sub-step 1: After repairs, use the OBD-II scanner to clear the B1291 code.
• Sub-step 2: Perform a system check to ensure that the airbag warning light remains off.