DESCRIPTION
This DTC is stored 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 No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
B2789 |
No Response from ID BOX |
No communication between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU)) |
(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the F21 ID code box (immobiliser code ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
NOTICE:
Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F1-13 (LIN) - F21-2 (LIN1) |
Ignition switch off |
Below 1 Ω |
F1-13 (LIN) or F21-2 (LIN1) - Body ground |
Ignition switch off |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - BATTERY, BODY GROUND) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F21-1 (+B) - F21-5 (GND) |
Always |
11 to 14 V |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F21-5 (GND) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Replace the ID code box (immobiliser code ECU).
HINT:
Refer to Registration.
Click here
|
4. |
REGISTER ECU CODE REGISTRATION |
(a) Register the recognition codes in the ECUs.
HINT:
Refer to Registration.
Click here
|
5. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Recheck for DTCs.
Body Electrical > Smart Key > Trouble CodesOK:
DTC B2789 is not output.
OK | ![]() |
END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Toyota CH-R Service Manual > Wireless Door Lock Control System(w/ Smart Key System): System Diagram
SYSTEM DIAGRAM
Wireless Door Lock Control System
Communication Table
Sender
Receiver
Signal
Line
Certification ECU
(Smart Key ECU Assembly)
Main Body ECU
(Multiplex Network Body ECU)
Wireless door lock ...
Toyota CH-R Service Manual > Park / Neutral Position Switch: Removal
REMOVAL
PROCEDURE
1. REMOVE NO. 1 ENGINE UNDER COVER
Click here
2. REMOVE REAR ENGINE UNDER COVER LH
Click here
3. REMOVE NO. 2 CYLINDER HEAD COVER
Click here
4. REMOVE RADIATOR COVER
Click here
5. REMOVE NO. 1 AIR CLEANER INLET
Click here
6. REMOVE AIR CLEA ...