DESCRIPTION
This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the ID code box; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box and ECM is different and an engine start is attempted.
Before troubleshooting for this DTC, make sure no certification ECU DTCs are output. If output, troubleshoot the certification ECU DTCs first.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B2799 |
One of the following conditions is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When the ID code box is replaced, refer to Registration (See page
).
PROCEDURE
1. |
CHECK CONNECTION OF CONNECTOR |
(a) Turn the engine switch off.
(b) Check that the connectors are properly connected to the ECM and ID code box.
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
2. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM) |
(a) Disconnect the F72 box connector.
(b) Disconnect the F50 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-5 (EFII) - F50-20 (IMO) |
Always |
Below 1 Ω |
F72-6 (EFIO) - F50-14 (IMI) |
||
F72-5 (EFII) or F50-20 (IMO) - Body ground |
Always |
10 kΩ or higher |
F72-6 (EFIO) or F50-14 (IMI) - Body ground |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
REGISTER RECOGNITION CODES |
(a) Register the recognition codes in the ECUs (See page
).
|
4. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
5. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
6. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2799 is not output.
OK | ![]() |
END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY) |
|
7. |
REPLACE ECM |
(a) Temporarily replace the ECM with a new or normally functioning one (See page
).
|
8. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
9. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2799 is not output.
OK | ![]() |
END (ECM IS DEFECTIVE) |
NG | ![]() |
REPLACE ID CODE BOX |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
The wireless door lock control system troubleshooting procedures are
based on the premise that the power door lock control system is operating
normally. Check the power door lock control system first before troub ...
Precaution
PRECAUTION
1. EXPRESSIONS OF IGNITION SWITCH
The type of ignition switch used on this model differs according to the specifications
of the vehicle.
The expressions listed in the table below are used in this section.
Expression
Ignit ...