Power Source Control
- Start Switch1
- Start Switch2
| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001R16S |
| Model Year Start: 2021 | Model: Avalon | Prod Date Range: [08/2020 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B2278; Engine/Power Switch Malfunction; 2021 - 2022 MY Avalon [08/2020 - ] | ||
|
DTC |
B2278 |
Engine/Power Switch Malfunction |
DESCRIPTION
This DTC is stored when the SSW1 contact signal and SSW2 contact signal, which are detected when the engine switch is operated, do not match.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|
|
B2278 |
Engine/Power Switch Malfunction |
When the engine switch is operated, the SSW1 contact signal and SSW2 contact signal do not match (1-trip detection logic*). |
|
DTC Output Confirmation Operation:
|
- *: Only detected while a malfunction is present.
Vehicle Condition and Fail-safe Function when Malfunction Detected
|
Vehicle Condition when Malfunction Detected |
Fail-safe Function when Malfunction Detected |
|---|---|
|
If either the SSW1 contact signal or SSW2 contact signal is stuck on, the power source mode cannot be changed by pressing the engine switch. If either the SSW1 contact signal or SSW2 contact signal is stuck off, emergency stop by pressing and holding the engine switch for 2 seconds or more cannot be operated. |
- |
Related Data List and Active Test Items
|
DTC No. |
Data List and Active Test |
|---|---|
|
B2278 |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
-
The smart key system (for Start Function, Gasoline Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, Gasoline Model) after confirming that the communication systems are functioning properly.
Click here
![2019 - 2022 MY Avalon [04/2018 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
-
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (START SWITCH1, START SWITCH2) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Power Source Control / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Power Source Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Start Switch1 |
Engine switch 1 status |
OFF or ON |
OFF: Engine switch not pressed ON: Engine switch pressed |
|
|
Start Switch2 |
Engine switch 2 status |
OFF or ON |
OFF: Engine switch not pressed ON: Engine switch pressed |
|
Body Electrical > Power Source Control > Data List
|
Tester Display |
|---|
|
Start Switch1 |
|
Start Switch2 |
OK:
The Techstream display changes correctly in response to the engine switch operation.
| NG |
|
|
|
2. |
READ VALUE USING TECHSTREAM (START SWITCH1, START SWITCH2) |
(a) Enter the following menus: Body Electrical / Power Source Control / Data List.
(b) According to the display on the Techstream, read the Data List while wiggling the wire harness.
Body Electrical > Power Source Control > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Start Switch1 |
Engine switch 1 status |
OFF or ON |
OFF: Engine switch not pressed ON: Engine switch pressed |
|
|
Start Switch2 |
Engine switch 2 status |
OFF or ON |
OFF: Engine switch not pressed ON: Engine switch pressed |
|
Body Electrical > Power Source Control > Data List
|
Tester Display |
|---|
|
Start Switch1 |
|
Start Switch2 |
OK:
The Techstream display changes correctly in response to the engine switch operation.
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE SWITCH) |
(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the G41 engine switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G40-23 (SSW1) - G41-5 (SS1) |
Always |
Below 1 Ω |
|
G40-21 (SSW2) - G41-1 (SS2) |
Always |
Below 1 Ω |
|
G40-11 (AGND) - G41-6 (AGND) |
Always |
Below 1 Ω |
|
G40-23 (SSW1) or G41-5 (SS1) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
G40-21 (SSW2) or G41-1 (SS2) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
G40-11 (AGND) or G41-6 (AGND) - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT ENGINE SWITCH |
(a) Remove the engine switch.
for 2GR-FKS: Click here
for A25A-FKS: Click here
(b) Inspect the engine switch.
for 2GR-FKS: Click here
for A25A-FKS: Click here
| OK |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
| NG |
|
REPLACE ENGINE SWITCH for 2GR-FKS: Click here
for A25A-FKS: Click here
|
|
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