DESCRIPTION This DTC is
stored when the SSW1 contact signal and SSW2 contact signal, which are
detected when the power switch is operated, do not match. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B2278 |
Engine/Power Switch Malfunction |
When the power switch is operated, the SSW1 contact signal and SSW2 contact signal do not match (1-trip detection logic*). |
- Power switch
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
|
- Turn the power 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 power switch. If
either the SSW1 contact signal or SSW2 contact signal is stuck off,
emergency stop by pressing and holding the power 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 power 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, HV 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, HV 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 power 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 | Power switch 1 status |
OFF or ON | OFF: Power switch not pressed
ON: Power switch pressed |
- If the power switch is pressed for a short time, the display may not change.
- Use this item to determine if the power switch input signal is malfunctioning.
| | Start Switch2 |
Power switch 2 status |
OFF or ON | OFF: Power switch not pressed
ON: Power switch pressed |
- Backup for power switch 1. However, when the power switch is pressed and
held, the control functions only when both power switch 1 and 2 are
normal.
- Behaves the same way as power 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 power 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 | Power switch 1 status |
OFF or ON | OFF: Power switch not pressed
ON: Power switch pressed |
- If the power switch is pressed for a short time, the display may not change.
- Use this item to determine if the power switch input signal is malfunctioning.
| | Start Switch2 |
Power switch 2 status |
OFF or ON | OFF: Power switch not pressed
ON: Power switch pressed |
- Backup for power switch 1. However, when the power switch is pressed and
held, the control functions only when both power switch 1 and 2 are
normal.
- Behaves the same way as power 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 power 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) - POWER SWITCH) |
(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the G117 power 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) - G117-5 (SS1) |
Always | Below 1 Ω | |
G40-21 (SSW2) - G117-1 (SS2) |
Always | Below 1 Ω | |
G40-11 (AGND) - G117-6 (AGND) |
Always | Below 1 Ω | |
G40-23 (SSW1) or G117-5 (SS1) - Other terminals and body ground |
Always | 10 kΩ or higher | |
G40-21 (SSW2) or G117-1 (SS2) - Other terminals and body ground |
Always | 10 kΩ or higher | |
G40-11 (AGND) or G117-6 (AGND) - Other terminals and body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
(a) Remove the power switch.
Click here (b) Inspect the power switch.
Click here
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPLACE POWER SWITCH | |
