Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM1000000027L72
Model Year Start: 2023 Model: RAV4 HV Prod Date Range: [10/2022 -           ]
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model, with Smart Key System): B1242; Wireless Door Lock Tuner Circuit Malfunction; 2023 - 2024 MY RAV4 HV [10/2022 -        ]

DTC

B1242

Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

The door control receiver receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly) via CAN communication system. The certification ECU (smart key ECU assembly) sends door lock/unlock commands to the main body ECU (multiplex network body ECU).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1242

Wireless Door Lock Tuner Circuit Malfunction

One of the following conditions is met:

  • Short in RDAM between the certification ECU (smart key ECU assembly) and door control receiver.
  • Short in RCO between the certification ECU (smart key ECU assembly) and door control receiver.
  • Door control receiver
  • Certification ECU (smart key ECU assembly)
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • If the certification ECU (smart key ECU assembly) is replaced, refer to the Smart Key System (for start function).

    Click here 2022 - 2024 MY RAV4 HV [12/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

  • When replacing or inspecting the door control receiver and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the door control receiver, entry and start function and wireless control function performance may be affected.
  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.
  • This DTC is not stored within 10 seconds of the power switch being turned from on (IG) to off.
  • When replacing the door control receiver, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.*
  • It is necessary to perform initialization after registration of the transmitter IDs into the door control receiver if the door control receiver has been replaced.*
    • for initialization:

      Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: INITIALIZATION

    • for registration:

      Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: REGISTRATION

  • *: for 12 Pin Type

PROCEDURE

1.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the M60*1 or M11*2 door control receiver connector.

  • *1: for 12 Pin Type
  • *2: for 5 Pin Type

(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

M7-19 (RDAM) - G54-18 (E)

Always

11 to 14 V

M7-18 (RCO) - G54-18 (E)

Always

Pulse generation at regular intervals

(Below 1 V ←→ 4.5 to 5.5 V)

Standard Resistance:

Tester Connection

Condition

Specified Condition

G54-18 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE DOOR CONTROL RECEIVER

NG

2.

CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)

(a) Disconnect the M7 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the M60*1 or M11*2 door control receiver connector.

  • *1: for 12 Pin Type
  • *2: for 5 Pin Type

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for 12 Pin Type

Tester Connection

Condition

Specified Condition

M7-19 (RDAM) - M60-2 (DATA)

Always

Below 1 Ω

M7-18 (RCO) - M60-8 (+5)

Always

Below 1 Ω

M60-12 (GND) - Body ground

Always

Below 1 Ω

M60-2 (DATA) or M7-19 (RDAM) - Other terminals and body ground

Always

10 kΩ or higher

M60-8 (+5) or M7-18 (RCO) - Other terminals and body ground

Always

10 kΩ or higher

for 5 Pin Type

Tester Connection

Condition

Specified Condition

M7-19 (RDAM) - M11-5 (DATA)

Always

Below 1 Ω

M7-18 (RCO) - M11-4 (+5)

Always

Below 1 Ω

M11-1 (GND) - Body ground

Always

Below 1 Ω

M11-5 (DATA) or M7-19 (RDAM) - Other terminals and body ground

Always

10 kΩ or higher

M11-4 (+5) or M7-18 (RCO) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR