Steering Column. Dtc B2788 Ig2 Signal Malfunction

Steering. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

Steering Column. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

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 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 an 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 tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.

DTC No.	DTC Detection Condition	Trouble Area
B2788	Open or short in IG2 signal circuit	Wire harness Steering lock actuator (Steering lock ECU) IG2 relay circuit

WIRING DIAGRAM

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Steering Column.Steering 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 step to wake up the ECU:

Before starting the inspection, 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.CHECK STEERING LOCK ACTUATOR

Measure the voltage of the steering lock actuator.
Standard voltage:
Tester Connection
Condition
Specified Condition
E6-6 (IG2) - E6-2 (SGND)
Engine switch on (IG)
11 to 14 V
E6-6 (IG2) - E6-2 (SGND)
Engine switch off
Below 1 V

INSPECT IG2 RELAY CIRCUIT

REPLACE STEERING LOCK ACTUATOR ASSEMBLY

Tester Connection	Condition	Specified Condition
E6-6 (IG2) - E6-2 (SGND)	Engine switch on (IG)	11 to 14 V
E6-6 (IG2) - E6-2 (SGND)	Engine switch off	Below 1 V