DTC    B2788    IG2 Signal Malfunction

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DESCRIPTION

The steering lock ECU receives IG2 relay signals. Receiving the signals, 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).

DTC No.
DTC Detecting Condition
Trouble Area
B2788
  1. Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for a period of 1 second.
  1. IG2 relay
  2. Wire harness
  3. Power source control ECU assembly
  4. Steering lock actuator assembly (Steering lock ECU)

WIRING DIAGRAM


C106498E03


INSPECTION PROCEDURE

1.INSPECT IG2 RELAY


    B060778E17

  1. Remove the IG2 relay from the engine room J/B and R/B No.2.

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

    Resistance:
    Tester Connection
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (when battery voltage is applied to terminals 1 and 2)



NG
REPLACE IG2 RELAY
OK


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


    C106484E13

  1. Disconnect the L28 connector from the steering lock actuator assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    L28-2 (SGND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)


    C106484E14

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    L28-6 (IG2) - L28-1 (GND)
    		Engine switch on (IG)
    		10 to 14 V
    L28-6 (IG2) - L28-2 (SGND)
    		Engine switch on (IG)
    		10 to 14 V

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    *L28-6 (IG2) - L28-7 (B)
    		Engine switch off
    		10 kΩ higher

    *: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.



OK
REPLACE STEERING LOCK ACTUATOR ASSEMBLY
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)