DTC    B2788    IG2 Signal Malfunction

for Preparation Click here


DESCRIPTION

The steering lock ECU determines the on (IG)/off status of the engine switch through the IG2 signal circuit. On 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 to prevent 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 because 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
  1. Harness or connector
  2. Steering lock actuator assembly (Steering lock ECU)
  3. IG2 relay circuit

WIRING DIAGRAM


C197478E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:
When the engine switch is off, the power management control ECU*1 or power source control ECU*2 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.
Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.

  1. *1: for 1KR-FE, 1NR-FE
  2. *2: for 1ND-TV
1.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
C195843E02

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D33-6 (IG2) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    D33-6 (IG2) - Body ground
    		Engine switch off
    		Below 1 V

    Text in Illustration 
    *1
    		Component with harness connected:
    (Steering Lock Actuator Assembly (Steering Lock ECU))



NG
REPAIR OR REPLACE RELAY CIRCUIT (IG2 RELAY)
OK


2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)


    C195842E01

  1. Disconnect the connector from the steering lock ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D33-1 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Steering Lock Actuator Assembly (Steering Lock ECU))



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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