- Wire harness or connector
- Certification ECU
- ECM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZL6O |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): B279A12; Engine Immobiliser System Circuit Short to Battery; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
DTC |
B279A12 |
Engine Immobiliser System Circuit Short to Battery |
DESCRIPTION
If the communication line (EFIO - IMI) to the certification ECU is stuck high output (e.g. shorted to +B), the ECM stores this DTC.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B279A12 |
When the communication line (EFIO - IMI) between ECM and certification ECU is stuck high output. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the certification ECU is replaced, register the key (See page
![2017 - 2020 MY Sienna [08/2016 - ]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): REGISTRATION](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Recheck for DTCs (See page
).
HINT:
If any DTCs other than DTC B279A12 are output, troubleshoot those DTCs first.
Result
|
Result |
Proceed to |
|---|---|
|
DTC B279A12 is output |
A |
|
DTC B279A12 and other DTCs are output |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ECM) |
(a) Disconnect the certification ECU connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D88-35 (EFIO) - A69-59 (IMI) |
Always |
Below 1 Ω |
|
D88-35 (EFIO) - Body ground |
Always |
10 kΩ or higher |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D88-35 (EFIO) - Body ground |
Always |
Below 1 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT SMART KEY ECU ASSEMBLY |
(a) Reconnect the certification ECU connector.
(b) Reconnect the ECM connector.
(c) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Certification ECU) |
*b |
GND |
|
*c |
HIGH |
*d |
LOW |
Waveform
|
Item |
Content |
|---|---|
|
Tester Connection |
D88-35 (EFIO) - D88-15 (E) |
|
Tool Setting |
5 V/DIV., 50 ms./DIV. |
|
Condition |
Engine switch on (IG) |
OK:
Waveform is output normally (See illustration).
| NG |
|
|
|
4. |
REPLACE SMART KEY ECU ASSEMBLY |
(a) Replace the certification ECU (See page
).
|
|
5. |
KEY REGISTRATION |
(a) Register the key (See page
).
|
|
6. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Recheck for DTCs (See page
).
OK:
DTC B279A12 is not output.
| OK |
|
END (CERTIFICATION ECU WAS DEFECTIVE) |
| NG |
|
|
|