Operation CHARM: Car repair manuals for everyone.
Hosted by mcallihan.com

B2791









DOOR LOCK: SMART KEY SYSTEM: B2791: Communication Condition Failure between ECM

DTC B2791 - Communication Condition Failure between ECM

DESCRIPTION

- If the ID code box receives a verification request signal from the ECM, it sends back verification information obtained from the certification ECU or steering lock ECU via the LIN communication line to the ECM.
- The ID code box sends immobilizer SET / UNSET signals to the ECM based on the information received from the certification ECU via the LIN communication line.
HINT:
- If the engine switch is turned off immediately after engine start, this DTC is also stored.
- If this DTC is detected, check if any other DTCs such as B2799 are output.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION OF ID CODE BOX
(a) Check that the engine switch can be turned on (IG) and the engine starts.
OK:
Engine switch can be turned on (IG) and the engine starts.
OK -- END (SYSTEM IS NORMAL)
NG -- CHECK THE OTHER DTC