B2789
NETWORKING: LIN COMMUNICATION SYSTEM: B2789: No Response from ID BOX
B2789 - No Response from ID BOX
DESCRIPTION
This DTC is stored 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 ignition 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 and bulbs for circuits related to this system before performing the following inspection procedure.
HINT
When communication between the ID code box and certification ECU stops, DTC B2785 is also stored.
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 How To Proceed With Troubleshooting
3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)
(a) Disconnect the F79 certification ECU connector.
(b) Disconnect the F72 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 F72 ID code box connector.
(b) Measure the resistance and voltage 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)