DTC Code | DTC Name |
---|---|
B2789 | No Response from ID BOX |
DESCRIPTION
This DTC is output when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.
DTC Code | DTC Detection Condition | Trouble Area |
---|---|---|
B2789 | No communication between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
When using the GTS with the engine switch off to troubleshoot:
Connect the GTS to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Before replacing the certification ECU (smart key ECU assembly), refer to the smart entry and start system (for Entry Function) Click here.
Tech Tips
DTC B2785 is output when the communication between all of the following components and certification ECU (smart key ECU assembly) stops.
PROCEDURE
CLEAR DTC
Clear the DTC Click here.
NEXT |
CHECK FOR DTC
Check for DTCs Click here.
Result | Proceed to |
---|---|
DTC B2789 is output | A |
DTC B2789 is not output | B |
B |
USE SIMULATION METHOD TO CHECK Click here |
A |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ID CODE BOX [IMMOBILISER CODE ECU])
Disconnect the B75 certification ECU (smart key ECU assembly) connector.
Disconnect the H81 ID code box (immobiliser code ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILIZER CODE ECU] - BATTERY AND BODY GROUND)
*a | Front view of wire harness connector (to ID Code Box [Immobilizer Code ECU]) |
Disconnect the ID code box (immobiliser code ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
Temporarily replace the certification ECU (smart key ECU assembly) with a new one.
NEXT |
CLEAR DTC
Clear the DTCs Click here.
NEXT |
CHECK FOR DTC
Check for DTCs Click here.
OK |
---|
DTC B2789 is not output. |
NG |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
OK |
END (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] IS DEFECTIVE)