DTC B1026:49 [START STOP UNIT]

• If this DTC is detected, the system will enter the fail-safe function to ensure safety. If a specified period of time has elapsed or the vehicle has been driven for a specified period of time or more while in fail-safe mode, the ignition will remain stuck in off and the engine cannot be started. Therefore, perform the malfunction diagnosis while the engine can be started. In addition, after having performed the malfunction diagnosis, verify that this DTC is not detected with the steering wheel locked. If the DTC is not detected, the system returns to normal from the fail-safe function.

System malfunction location	Steering lock malfunction
Detection condition	• Start stop unit detects malfunction in the steering lock of the internal start stop unit.
Fail-safe	• The system will enter the fail-safe function to ensure safety. If a specified period of time has elapsed or the vehicle has been driven for a specified period of time or more while in fail-safe mode, the ignition will remain stuck in off and the engine cannot be started.
Possible cause	• Start stop unit malfunction
System wiring diagram	—

System malfunction location

Steering lock malfunction

Detection condition

• Start stop unit detects malfunction in the steering lock of the internal start stop unit.

Fail-safe

• The system will enter the fail-safe function to ensure safety. If a specified period of time has elapsed or the vehicle has been driven for a specified period of time or more while in fail-safe mode, the ignition will remain stuck in off and the engine cannot be started.

Possible cause

• Start stop unit malfunction

System wiring diagram

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Step	Inspection	Action
1	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS START STOP UNIT • Clear DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC B1026:49 displayed?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
No	Go to the next step.
2	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
No	DTC troubleshooting completed.

Step

Inspection

Action

PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS START STOP UNIT

• Clear DTC for the start stop unit using the M-MDS.

(See CLEARING DTC [START STOP UNIT].)

• Perform the DTC inspection for the start stop unit using the M-MDS.

(See DTC INSPECTION [START STOP UNIT].)

• Is DTC B1026:49 displayed?

Yes

Replace the start stop unit, then go to the next step.

(See START STOP UNIT REMOVAL/INSTALLATION.)

Go to the next step.

VERIFY IF OTHER DTCs DISPLAYED

• Are any other DTCs displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [START STOP UNIT].)

DTC troubleshooting completed.