DTC B2789-87: ID-BOX Missing Message [11/2023 - ]: Procedure

Pre-procedure1

1. Disconnect the H138 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H53 ID code box (immobiliser code ECU) connector.

   Procedure1

3. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H138-8 (LIN) - H53-2 (LIN1)	Ignition switch off	Below 1 Ω
   H138-8 (LIN) or H53-2 (LIN1) - Body ground	Ignition switch off	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H53-1 (+B) - Body ground	Ignition switch off	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H53-5 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the ID code box (immobiliser code ECU).

   HINT: 

   Refer to REMOVAL [11/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Register the recognition codes in the ECUs.

   HINT: 

   except Gasoline Model: Refer to REGISTRATION [11/2023 - ]

   for Gasoline Model: Refer to REGISTRATION [11/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Body Electrical > Smart Key > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   Result

   Result	Proceed to
   B2789-87 is not output	A
   B2789-87 is output	B

Result: 

A 

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) 

Result: 

B 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2023 - ]