Dtc B2788 Ig2 Signal Malfunction

Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200
Steering Column. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) (POWER SOURCE MODE SIGNAL)

DTC B2788 IG2 Signal Malfunction


DESCRIPTION

This DTC is stored when the steering lock ECU (steering lock actuator assembly) detects an IG2 power supply malfunction.
HINT:
The steering lock ECU (steering lock actuator assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

DTC No.
Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2788
Mismatch between the steering lock ECU (steering lock actuator assembly) IG2 input from the LIN communication system and from the direct line (1-trip detection logic*).
  1. Steering lock ECU (Steering lock actuator assembly)
  2. Harness or connector
No confirmation operation is necessary (monitoring is continuous).
  1. *: Only output while a malfunction is present and the engine switch is on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Function when Malfunction Detected
The steering cannot be locked or unlocked. For this reason, the engine cannot be started.
-

Related Data List and Active Test Items
DTC No.
Data List Item
Active Test Item
B2788
-
-

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2788 Ig2 Signal Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When using the GTS with the engine 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 the vehicle type under manual mode and enter the following menus:
    Body Electrical / Entry&Start. 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.
  2. The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  4. After performing repairs, confirm that no DTCs are output again (Click here).
  5. When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed (refer to Service Bulletin).
1.INSPECT STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) (POWER SOURCE MODE SIGNAL)

  1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

  1. Disconnect the E26 steering lock ECU (steering lock actuator assembly) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2788 Ig2 Signal Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E26-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Steering Lock ECU (Steering Lock Actuator Assembly))

  1. Reconnect the E26 steering lock ECU (steering lock actuator assembly) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2788 Ig2 Signal Malfunction

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E26-6 (IG2) - E26-1 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    E26-6 (IG2) - E26-1 (GND)
    		Engine switch off
    		Below 1 V
    Text in Illustration
    *a
    		Component with harness connected
    (Steering Lock ECU (Steering Lock Actuator Assembly))
    Result
    Result
    		Proceed to
    OK
    		for Manual Tilt and Manual Telescopic Steering Column
    		A
    for Power Tilt and Power Telescopic Steering Column
    		B
    NG
    		C


B
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) (Click here)