Steering Column. Dtc B2788 Ig2 Signal Malfunction

CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

DTC B2788 IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.
The steering lock ECU does not lock the steering when it receives the 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 as the steering lock ECU is not connected to the CAN communication system.

DTC Code	Detection Condition	Trouble Area
B2788	The IG2 input to the steering lock ECU does not match the LIN communication input.	IGN fuse Steering lock actuator assembly (steering lock ECU) Power management control ECU Harness or connector

WIRING DIAGRAM

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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.

NOTICE:

If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for Automatic Transmission), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
When replacing the steering lock ECU, registration must be performed. Refer to the Service Bulletin for the registration procedure.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

Disconnect the G35 steering lock ECU connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
G35-1 (GND) - Body ground
Always
Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Steering Lock ECU)

Text in Illustration
*a	Front view of wire harness connector (to Steering Lock ECU)

Reconnect the G35 steering lock ECU connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
G35-6 (IG2) - G35-1 (GND)
Engine switch on (IG)
11 to 14 V
G35-6 (IG2) - G35-1 (GND)
Engine switch off
Below 1 V
Text in Illustration
*a
Component with harness connected
(Steering Lock ECU)

Result
Result
Proceed to
NG
A
OK
for Manual Tilt and Manual Telescopic Steering Column
B
for Power Tilt and Power Telescopic Steering Column
C

Text in Illustration
*a	Component with harness connected (Steering Lock ECU)

Result
Result	Proceed to
NG	A
OK	for Manual Tilt and Manual Telescopic Steering Column	B
for Power Tilt and Power Telescopic Steering Column	C

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01JX.html)

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01KX.html)

CHECK FOR SHORT IN ALL HARNESSES, CONNECTORS AND COMPONENTS CONNECTED TO IG2 FUSE

Tester Connection	Condition	Specified Condition
G35-1 (GND) - Body ground	Always	Below 1 Ω

Tester Connection	Switch Condition	Specified Condition
G35-6 (IG2) - G35-1 (GND)	Engine switch on (IG)	11 to 14 V
G35-6 (IG2) - G35-1 (GND)	Engine switch off	Below 1 V