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
Body Electrical > Smart Key > Clear DTCs(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 > Meter / Gauge System: On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT COMBINATION METER ASSEMBLY
(a) Check speedometer operation
NOTICE:
The combination meter assembly receives the vehicle speed signal from
the skid control ECU (brake actuator assembly) via CAN communication. Therefore,
perform the follow ...
Toyota CH-R Service Manual > Combination Meter: Disassembly
DISASSEMBLY
CAUTION / NOTICE / HINT
NOTICE:
When removing and installing the combination meter glass, make sure
not to touch the display panel.
Do not allow any dirt (fingerprints, grease, etc.) to adhere to the
combination meter glass. If the glass is dirty, wipe it clean wit ...