LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2012 >> Matrix Base, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 347 (Wireless Door Lock Control System (W/O Smart Key System) (Diagnostic Codes & Symptom Tests)) >> WIRELESS DOOR LOCK CONTROL SYSTEM (W/O Smart Key System) >> DTC B1242: Wireless Door Lock Tuner Circuit Malfunction >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B1242: Wireless Door Lock Tuner Circuit Malfunction: Description

WARNING: This page is about a different car, the 2012 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU.

DTC No. DTC Detection Condition Trouble Area
B1242 In diagnostic mode, an applicable RDA signal cannot be received within 2.4 second after an PRG signal has been output from the main body ECU.
  • Wire harness or connector
  • Door control receiver
  • Main body ECU (Instrument panel junction block)