THEFT DETERRENT / KEYLESS ENTRY ENTRY AND START SYSTEM(for Start Function) 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*). | ·
Engine switch ·
Certification ECU (smart key ECU assembly) ·
Harness or connector |
DTC Output Confirmation Operation:
Turn the engine switch on (IG). |
*: Only detected while a malfunction is present.
| 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. | - |
| DTC No. | Data List and Active Test |
|---|---|
| B2278 | Power Source Control
·
Starter Switch1 ·
Starter Switch2 |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
·The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.
·Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.
·After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Power Source Control / Data List.
Read the Data List according to the display on the GTS.
- 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 power source mode can only be changed 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 - 50003 223 4,5
- OK:
The GTS display changes correctly in response to the engine switch operation.
- Result:
Proceed to OK NG
OK
NG
According to the display on the GTS, 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 power source mode can only be changed 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 - 50003 223 4,5
- OK:
The Data List changes for both "Start Switch1" and "Start Switch2" when the push start switch is operated while jiggling the wire harness.
- Result:
Proceed to OK NG
OK
NG
Disconnect the N156 certification ECU (smart key ECU assembly) connector.
Disconnect the N162 engine switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition N156-23 (SSW1) - N162-5 (SS1) Always Below 1 Ω N156-21 (SSW2) - N162-1 (SS2) Always Below 1 Ω N156-11 (AGND) - N162-6 (AGND) Always Below 1 Ω N156-23 (SSW1) or N162-5 (SS1) - Other terminals and body ground Always 10 kΩ or higher N156-21 (SSW2) or N162-1 (SS2) - Other terminals and body ground Always 10 kΩ or higher N156-11 (AGND) or N162-6 (AGND) - Other terminals and body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Remove the engine switch.
for 7GR-FKS:
for 1GD-FTV:
Inspect the engine switch.
for 7GR-FKS:
for 1GD-FTV:
- Result:
Proceed to OK NG
OK
NG
for 7GR-FKS:
for 1GD-FTV: