DESCRIPTION
This DTC is stored when LIN communication between the certification ECU and ID code box stops for 10 seconds or more.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B2789 |
No communication between the certification ECU and ID code box for 10 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
HINT:
When communication between the ID code box and certification ECU stops, DTC B2785 is also stored.
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2789 is not output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX) |
(a) Disconnect the F79 certification ECU connector.
(b) Disconnect the F72 ID code box connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F79-29 (LIN) - F72-3 (LIN1) |
Always |
Below 1 Ω |
F79-29 (LIN) or F72-3 (LIN1) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND) |
(a) Disconnect the F72 ID code box connector. |
|
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-8 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-1 (+B) - Body ground |
Always |
11 to 14 V |
*a |
Front view of wire harness connector (to ID Code Box) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE ID CODE BOX |
(a) Temporarily replace the ID code box with a new one (See page
).
|
6. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
7. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2789 is not output.
OK | ![]() |
END (ID CODE BOX IS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU |
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" ...
Air Conditioning Panel
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL HEATER CONTROL ASSEMBLY
(a) Attach the 4 clips to install the heater control assembly.
2. INSTALL NO. 1 INSTRUM ...