B2789

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER 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

PROCEDURE

1. CHECK FOR DTC
(a) Delete the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTC.
OK:
DTC B2789 output does not reoccur.
OK -- NORMAL
NG -- Continue to next step.
2. CHECK WIRE HARNESS (CERTIFICATION ECU - ID CODE BOX)




(a) Disconnect the U28 ECU connector.
(b) Disconnect the K58 box connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK CERTIFICATION ECU (OPERATION)
(a) Temporarily replace the certification ECU with a new or normally functioning one.
(b) Check for DTC.
OK:
DTC B2789 output does not reoccur.
NG -- REPLACE ID CODE BOX
OK -- END (CERTIFICATION ECU IS DEFECTIVE)