Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Door Lock. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

DTC B1242 Wireless Door Lock Tuner Circuit Malfunction


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 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).
NOTICE:
  1. 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 (w/ Entry Function) and wireless function performance may be affected.
  2. This DTC is not stored within 10 seconds of the engine switch being turned from on (IG) to off.
  3. The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.
  4. 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 (w/ Tire Pressure Warning System).
  5. 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 (w/ Tire Pressure Warning System).

DTC Code
DTC Detection Condition
Trouble Area
B1242
  1. Short in RDAM to ground between the certification ECU (smart key ECU assembly) and door control receiver.
  2. Short in CSEL to ground between the certification ECU (smart key ECU assembly) and door control receiver.
  3. Short in RDAM to ground when RCO (5 V) output from the ECU is off.
  1. Harness or connector
  2. Door control receiver
  3. Certification ECU (smart key ECU assembly)

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

  1. Disconnect the L64*1 or L65*2 receiver connector.
    *1: for 5 Pin Type
    *2: for 12 Pin Type

    Text in Illustration
    *A
    		for 12 Pin Type
    *B
    		for 5 Pin Type
    *a
    		Front view of wire harness connector
    (to Door Control Receiver)

  1. Reconnect the E129 ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    for 5 Pin Type:

    Tester Connection
    		Condition
    		Specified Condition
    L64-4 (+5) - Body ground
    Procedure:
    1. Engine switch off
    2. Electrical key transmitter subassembly brought outside detection area but kept inside wireless function operational area
    3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
    		Pulse generation
    L64-2 (CSEL) - Body ground
    Procedure:
    1. Engine switch off
    2. All doors closed
    		Below 1 V → Pulse generation
    L64-5 (DATA) - Body ground
    Procedure:
    1. Engine switch off
    2. All doors locked
    3. Electrical key transmitter subassembly not inside vehicle
    4. Electrical key transmitter subassembly brought outside detection area but kept inside wireless function operational area
    5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
    		Pulse generation

Standard Voltage:
for 12 Pin Type:

Tester Connection
Condition
Specified Condition
L65-8 (+5) - Body ground
Procedure:
  1. Engine switch off
  2. Electrical key transmitter subassembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
Pulse generation
L65-6 (CSEL) - Body ground
Procedure:
  1. Engine switch off
  2. All doors closed
Below 1 V → Pulse generation
L65-2 (DATA) - Body ground
Procedure:
  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter subassembly not inside vehicle
  4. Electrical key transmitter subassembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
Pulse generation
Result
Result
Proceed to
OK
A
NG (for 5 Pin Type)
B
NG (for 12 Pin Type)
C


B
REPLACE DOOR CONTROL RECEIVER (Click here)

C
REPLACE DOOR CONTROL RECEIVER (Click here)
A


2.CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND )

  1. Disconnect the E129 and E130 certification ECU (smart key ECU assembly) connectors.

  1. Disconnect the L64*1 or L65*2 door control receiver connector.
    *1: for 5 Pin Type
    *2: for 12Pin Type

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

    Standard Resistance:
    for 5 Pin Type:
    Tester Connection
    		Condition
    		Specified Condition
    E129-19 (CSEL) - L64-2 (CSEL)
    		Always
    		Below 1 Ω
    E129-20 (RDAM) - L64-5 (DATA)
    E129-18 (RCO) - L64-4 (+5)
    E130-11 (E) - Body ground
    L64-1 (GND) - Body ground
    E129-19 (CSEL) or L64- 2 (CSEL) - Body ground
    		Always
    		10 kΩ or higher
    E129-20 (RDAM) or L64- 5 (DATA) - Body ground
    E129-18 (RCO) or L64-4 (+5) - Body ground
    for 12 Pin Type:
    Tester Connection
    		Condition
    		Specified Condition
    E129-19 (CSEL) - L65-6 (CSEL)
    		Always
    		Below 1 Ω
    E129-20 (RDAM) - L65-2 (DATA)
    E129-18 (RCO) - L65-8 (+5)
    E130-11 (E) - Body ground
    L65-12 (GND) - Body ground
    E129-19 (CSEL) or L65- 6 (CSEL) - Body ground
    		Always
    		10 kΩ or higher
    E129-20 (RDAM) or L65- 2 (DATA) - Body ground
    E129-18 (RCO) or L65-8 (+5) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)