DTC B2789: No Response from ID BOX [06/2015 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Entry & Start > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Entry & Start > Trouble Codes 

   Result

   Result	Proceed to
   DTC B2789 is not output	A
   DTC B2789 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

See step  3

1. Disconnect the G41 certification ECU (smart key ECU assembly) connector.
2. Disconnect the G15 ID code box (immobilizer code ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G41-6 (LIN) - G15-2 (LIN1)	Always	Below 1 Ω
   G41-6 (LIN) or G15-2 (LIN1)- Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the ID code box (immobilizer code ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to ID Code Box (Immobilizer Code ECU))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G15-5 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G15-1 (+B) - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Temporarily replace the certification ECU (smart key ECU assembly) with a new or normally functioning one.

   Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Entry & Start > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Entry & Start > Trouble Codes 

   Result

   Result	Proceed to
   DTC B2789 is not output	A
   DTC B2789 is output	B

Result: 

A 

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) 

Result: 

B 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ]