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*). |
- Engine switch
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
|
- Turn the engine switch on (IG).
|
- *: 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 | Power Source Control
- Start Switch1
- Start Switch2
| 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 
- 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 |
- If the engine switch is pressed for a short time, the display may not change.
- Use this item to determine if the engine switch input signal is malfunctioning.
| | Start Switch2 |
Engine switch 2 status |
OFF or ON | OFF: Engine switch not pressed
ON: Engine switch pressed |
- Backup for engine switch 1. However, when the engine switch is pressed
and held, the control functions only when both engine switch 1 and 2 are
normal.
- Behaves the same way as engine switch 1.
| 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 |
 | GO TO STEP 3 |
|
OK |
 | |
| 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 |
- If the engine switch is pressed for a short time, the display may not change.
- Use this item to determine if the engine switch input signal is malfunctioning.
| | Start Switch2 |
Engine switch 2 status |
OFF or ON | OFF: Engine switch not pressed
ON: Engine switch pressed |
- Backup for engine switch 1. However, when the engine switch is pressed
and held, the control functions only when both engine switch 1 and 2 are
normal.
- Behaves the same way as engine switch 1.
| 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 |
| USE SIMULATION METHOD TO CHECK |
| 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 |
|
OK | |
| |
(a) Remove the engine switch.
Click here (b) Inspect the engine switch.
Click here
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPLACE ENGINE SWITCH | |
