April 5, 2026: LEMON Manuals is launched! Read the announcement.

Power Source Mode does not Change to ON (ACC) [09/2015 - ]: Procedure

CHECK FOR DTC

Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.

Body Electrical > Power Source Control > Trouble Codes

Body Electrical > Smart Access > Trouble Codes

Body Electrical > Starting Control > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
Smart access system with push-button start (for Start Function) DTCs are output	B

Result:

B

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2015 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ]

Result:

A

See step 2

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
See step 3

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 3
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)
See step 4

Result

Proceed to

OK

NG

Result:

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] , or refer to REMOVAL [08/2019 - ]

Result:

OK

See step 4
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
See step 5

Result

Proceed to

OK

NG

Result:

OK

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - 08/2016] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 12/2017] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 08/2019] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ]

Result:

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] , or refer to REMOVAL [08/2019 - ]