B2789

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2789: No Response from ID BOX

DTC B2789 - No Response from ID BOX

DESCRIPTION

This DTC is output when the certification ECU does not receive LIN communication from the ID code box for 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the certification ECU or ID code box is replaced, register the key and ECU communication ID .

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTCs .
(b) Recheck for DTCs .
Result:






B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)





(a) Disconnect the E58 ECU and E50 ID code box connectors.
(b) 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.
3. REPLACE CERTIFICATION ECU
(a) Replace the certification ECU.
NEXT -- Continue to next step.
4. ELECTRICAL KEY REGISTRATION
(a) Register the electrical key code in the certification ECU .
NEXT -- Continue to next step.
5. REGISTER ECU COMMUNICATION ID
(a) Register the ECU communication ID between the ID code box and hybrid vehicle control ECU .
NEXT -- Continue to next step.
6. CHECK DTC OUTPUT
(a) Delete the DTCs .
(b) Recheck for DTCs .
Result:






B -- END
A -- REPLACE ID CODE BOX