B2789
NETWORKING: LIN COMMUNICATION SYSTEM: B2789: No Response from ID BOX
B2789 - No Response from ID BOX
DESCRIPTION
This DTC is output when LIN communication between the certification ECU and ID code box stops for 10 seconds or more.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* Before replacing the certification ECU or ID code box, refer to the engine immobilizer system Engine Immobilizer System.
HINT
When DTC B2789 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first B2785.
PROCEDURE
1. CLEAR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.
2. CHECK FOR DTC
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B2789 is not output.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)
OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)
(a) Disconnect the G26 certification ECU connector.
(b) Disconnect the G25 ID code box connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)
(a) Disconnect the G25 ID code box connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE ID CODE BOX
(a) Temporarily replace the ID code box with a new one Removal.
NEXT -- Continue to next step.
6. CLEAR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.
7. CHECK FOR DTC
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B2789 is not output.
NG -- REPLACE CERTIFICATION ECU Removal
OK -- END (ID CODE BOX IS DEFECTIVE)