Stop and Start Priority Control System [12/2019 - 10/2022]: Procedure

1. Check the problem symptoms.

   HINT: 

   • Check each symptom by checking the suspected areas in the table below.
   • By using the GTS and entering the following menus, the selected mode can be confirmed.

     Powertrain / Stop and Start / Data List / Stop & Start A/C Mode

   Result

   Problem Symptoms	Trouble Area	Proceed to
   Multi-information display screen does not change after pressing steering pad switch assembly	Steering pad switch assembly Spiral cable sub-assembly Combination meter assembly Engine stop and start ECU Wire harness or connector (steering pad switch assembly - combination meter assembly, radio and display receiver assembly or radio receiver assembly) CAN communication system	A
   When the stop and start system cancel switch (eco-run cancel switch assembly) is pressed and held, the status change interrupt display in the combination meter assembly is not displayed, and control does not change	Stop and start system cancel switch (eco-run cancel switch assembly) Engine stop and start ECU Wire harness or connector (stop and start system cancel switch (eco-run cancel switch assembly) - engine stop and start ECU)	B
   Even though the stop and start system cancel switch (eco-run cancel switch assembly) and steering pad switch assembly are operated, the multi-information display screen does not change, and control does not change	Engine stop and start ECU CAN communication system	C
   Multi-information display screen changes without pressing steering pad switch assembly	Steering pad switch assembly Spiral cable sub-assembly Wire harness or connector (steering pad switch assembly - combination meter assembly, radio and display receiver assembly or radio receiver assembly)	D
   The status change interrupt display in the combination meter assembly is not displayed, but control changes	Combination meter assembly	E
   The status change interrupt display in the combination meter assembly is displayed, but control does not change	Air conditioning amplifier assembly CAN communication system	F
   Control mode returns to default mode after turning ignition switch ON	Engine stop and start ECU	G

Result: 

B 

GO TO STOP AND START CANCEL SWITCH CIRCUIT. Refer to  Stop and Start Cancel Switch Circuit [12/2019 - 10/2022] 

Result: 

C 

See step  3

Result: 

D 

See step  4

Result: 

E 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

F 

See step  7

Result: 

G 

See step  8

Result: 

A 

See step  2

1. Using the steering pad switch assembly, check that all functions other than "Stop & Start Settings" can be selected.

   Result

   Result	Proceed to
   Only "Stop & Start Settings" cannot be selected	A
   No function can be selected using the steering pad switch assembly	B

Result: 

A 

See step  3

Result: 

B 

See step  4

1. Perform a road test.
2. Read the DTCs.

   Powertrain > Stop and Start > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   CAN DTCs are output	B

Result: 

A 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] 

1. Disconnect the spiral cable sub-assembly connector.
2. Disconnect the combination meter assembly connector.
3. Disconnect the radio and display receiver assembly connector. (w/o 12.3 Inch Display)
4. Disconnect the radio receiver assembly connector. (w/ 12.3 Inch Display)
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H24-11 (+DP) - H21-29 (MSTI)	Always	Below 1 Ω
   H24-10 (+DP2) - H21-28 (MSM+)	Always	Below 1 Ω
   H24-4 (EAU) - H1-24 (SWG)*1	Always	Below 1 Ω
   H24-4 (EAU) - H4-24 (SWG)*2	Always	Below 1 Ω
   H24-11 (+DP) or H21-29 (MSTI) - Body ground and other terminals	Always	10 kΩ or higher
   H24-10 (+DP2) or H21-28 (MSM+) - Body ground and other terminals	Always	10 kΩ or higher
   H24-4 (EAU) or H1-24 (SWG)*1 - Body ground and other terminals	Always	10 kΩ or higher
   H24-4 (EAU) or H4-24 (SWG)*2 - Body ground and other terminals	Always	10 kΩ or higher

   1. *1: w/o 12.3 Inch Display
   2. *2: w/ 12.3 Inch Display

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

OK 

See step  6

Refer to INSPECTION [12/2019 - ]

Result

Result: 

OK 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

1. Perform a road test.
2. Read the DTCs.

   Powertrain > Stop and Start > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   CAN DTCs are output	B

Result: 

A 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] 

1. Perform a road test.
2. Read the DTCs.

   Powertrain > Stop and Start > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

A 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2022]