Toyota 4Runner: No Response from ID BOX (B2789)
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:
- When using the Techstream with the ignition switch off to troubleshoot:
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.
- Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.
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 .gif)
).
|
.gif)
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B2789 is not output.
| OK | .gif) |
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 |
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Main Body ECU (Multiplex Network Body ECU)
DTC Code
Detection Item
See page
B1206
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DESCRIPTION
This DTC is stored when LIN communication between the drive monitor switch and
combination meter assembly stops 10 seconds or more.
DTC Code
DTC Detection Conditi ...
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HINT:
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CAUTION / NOTICE / HINT
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Maintain the vehicle in a horizontal position while adjusting ...
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