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

INSPECT FUSE (IGN, IG2 MAIN)

INSPECT INTEGRATION RELAY (IG2 RELAY)

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

DTC B2788 IG2 Signal Malfunction


DESCRIPTION

The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.
After receiving an integration relay (IG2 relay) on signal, the steering lock ECU determines that the vehicle is moving.
The steering lock ECU does not lock the steering when it receives the integration relay (IG2 relay) on signal. This prevents the steering from being locked while the vehicle is moving.
The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

DTC Code
Detection Condition
Trouble Area
B2788
Open or short in IG2 signal circuit
  1. Steering lock actuator assembly (steering lock ECU)
  2. IGN fuse
  3. IG2 MAIN fuse
  4. Integration relay (IG2 relay)
  5. Main body ECU
  6. Harness or connector

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

HINT:
When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:
With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
1.INSPECT STEERING LOCK ECU
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
    		Switch Condition
    		Specified Condition
    E26-6 (IG2) - E26-1 (GND)
    		Engine switch off
    		Below 1 V
    E26-6 (IG2) - E26-1 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    Result
    Result
    		Proceed to
    Within specified range (for Power tilt and telescopic)
    		A
    Outside specified range
    		B
    Within specified range (for Manual tilt and telescopic)
    		C


B
Go to step 2

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

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

2.INSPECT FUSE (IGN, IG2 MAIN)

  1. Remove the IGN fuse and IG2 MAIN fuse from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    IGN fuse
    		Always
    		Below 1 Ω
    IG2 MAIN fuse
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


3.INSPECT INTEGRATION RELAY (IG2 RELAY)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2788 Ig2 Signal Malfunction

  1. Remove the integration relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1B-8 - 1C-1
    		Battery voltage is applied to terminals 1B-6 and 1B-7
    		Below 1 Ω
    1B-8 - 1C-1
    		Battery voltage is not applied to terminals 1B-6 and 1B-7
    		10 kΩ or higher


NG
REPLACE INTEGRATION RELAY (IG2 RELAY)
OK


4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

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

  1. Disconnect the E26 steering lock ECU connector.

  1. Disconnect the 1B and 1C integration relay connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1C-1 - Body ground
    		Always
    		11 to 14 V
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E26-6 (IG2) - 1B-8
    		Always
    		Below 1 Ω
    E26-6 (IG2) or 1B-8 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

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

  1. Disconnect the E2 main body ECU connector.

  1. Disconnect the 1B integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E2-11 (IG2D) - 1B-6
    		Always
    		Below 1 Ω
    1B-7 - Body ground
    		Always
    		Below 1 Ω
    E2-11 (IG2D) or 1B-6 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU