What causes B1242 on a Toyota?

Open or short in the wireless door lock tuner circuit Loose or corroded connector at the door control receiver Damaged harness on the wireless door lock tuner circuit Failed door control receiver Low system voltage

How do I fix B1242 on a Toyota?

Confirm the code and read freeze frame data Check battery voltage and the charging system Inspect and reseat the door control receiver connector Test the wireless door lock tuner circuit for opens and shorts Replace the door control receiver only after the circuit tests fail

B1242 Wireless door lock tuner circuit malfunction

Q: What does B1242 mean on a Toyota?

B1242. Wireless door lock tuner circuit malfunction. The door control receiver signal to the certification ECU is faulty. Applies to Toyota, Lexus and Scion models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Toyota, Lexus and Scion models that use this code

What does B1242 mean on a Toyota?

B1242. Wireless door lock tuner circuit malfunction. The door control receiver signal to the certification ECU is faulty. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B1242

Open or short in the wireless door lock tuner circuit
Loose or corroded connector at the door control receiver
Damaged harness on the wireless door lock tuner circuit
Failed door control receiver
Low system voltage

How to fix B1242

Confirm the code and read freeze frame data
Check battery voltage and the charging system
Inspect and reseat the door control receiver connector
Test the wireless door lock tuner circuit for opens and shorts
Replace the door control receiver only after the circuit tests fail