Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM10000000261LC
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for TMC Made with Smart Key System): B124296; Wireless Door Lock Tuner Component Internal Failure; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

DTC

B124296

Wireless Door Lock Tuner Component Internal Failure

DESCRIPTION

The door control receiver is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the door control receiver. 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). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B124296

Wireless Door Lock Tuner Component Internal Failure

  • Short to ground in RDAM terminal circuit between the certification ECU (smart key ECU assembly) and door control receiver.
  • Short to ground in RDAM terminal circuit when voltage (5 V) is not being output from terminal RCO
  • Wire harness or connector
  • Door control receiver
  • Certification ECU (smart key ECU assembly)

WIRING DIAGRAM

for 12 Pin Type

for 5 Pin Type

CAUTION / NOTICE / HINT

NOTICE:

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

    for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    for Gasoline Model: Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function (Gasoline Model, except TMMMS Made)): 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, the performance of the entry function and wireless function may be affected.
  • This DTC is not stored within 10 seconds of the ignition switch being turned from on to off.
  • Make sure that there are no electrical key transmitter sub-assemblies in the vehicle.
  • If the door control receiver has been replaced, it is necessary to perform initialization (Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for HV Model): INITIALIZATION ) after registration (Click here 2020 - 2023 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 11/2022]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for Gasoline Model (for Type A)): REGISTRATION ) of the transmitter IDs to the door control receiver assembly.
  • When replacing the door control receiver, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the GTS and write them down before removal.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 11/2022]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM (for Gasoline Model (for Type A)): REGISTRATION

PROCEDURE

1.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the O170*1 or O38*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 Resistance:

Tester Connection

Condition

Specified Condition

I167-29 (E) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Condition

Specified Condition

O174-11 (RDAM) - I167-29 (E)

Always

11 to 14 V

O174-21 (RCO) - I167-29 (E)

Always

Below 1 V → 4.5 to 5.5 V pulse generation at regular intervals

Result

Proceed to

OK (for 12 Pin Type)

A

OK (for 5 Pin Type)

B

NG

C

A

REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

B

REPLACE DOOR CONTROL RECEIVER ASSEMBLY

C

2.

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

(a) Disconnect the O174 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

for 12 Pin Type

Tester Connection

Condition

Specified Condition

O174-11 (RDAM) - O170-2 (DATA)

Always

Below 1 Ω

O174-21 (RCO) - O170-8 (+5)

Always

Below 1 Ω

O170-12 (GND) - Body ground

Always

Below 1 Ω

O170-2 (DATA) or O174-11 (RDAM) - Other terminals and body ground

Always

10 kΩ or higher

O170-8 (+5) or O174-21 (RCO) - Other terminals and body ground

Always

10 kΩ or higher

for 5 Pin Type

Tester Connection

Condition

Specified Condition

O174-11 (RDAM) - O38-5 (DATA)

Always

Below 1 Ω

O174-21 (RCO) - O38-4 (+5)

Always

Below 1 Ω

O38-1 (GND) - Body ground

Always

Below 1 Ω

O174-11 (RDAM) or O38-5 (DATA) - Other terminals and body ground

Always

10 kΩ or higher

O174-21 (RCO) or O38-4 (+5) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR