SMART ENTRY AND START SYSTEM(for Start Function) Power Source Mode does not Change to ON (IG and ACC)

DESCRIPTION

If any of the following operations are performed, the certification ECU (Smart key ECU assembly) receives a signal, and changes the power source mode.

With the electrical key transmitter sub-assembly in the cabin, the power switch is pressed.
When the auxiliary battery of the electrical key transmitter sub-assembly is depleted, the brake pedal is depressed and the electrical key transmitter sub-assembly is held near the power switch.
When the smart entry and start system cancel function has been canceled on the customization menu, the brake pedal is depressed and the electrical key transmitter sub-assembly is held near the power switch.

WIRING DIAGRAM


*a	No. 1 Integration Relay
*b	Certification ECU (Smart Key ECU Assembly)

CAUTION / NOTICE / HINT

Note

When using the GTS with the vehicle power switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). 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 smart entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.
Before replacing the electrical key transmitter sub-assembly, refer to the smart entry and start system (for Start Function) precaution Click here.
Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Click here.
If the smart entry and start system is disabled through the customize function, enable the system before performing troubleshooting Click here.
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After completing repairs, confirm that the problem does not occur.

Tech Tips

Related Data List and Active Test Items
Problem Symptom	Data List Item	Active Test Item
Power source mode does not change to on (IG) or on (ACC)	Power Source Control Start Switch1 Start Switch2 Power Supply Condition IG1 Relay Monitor(Inside) IG2 Relay Monitor(Inside) IG1 Relay Monitor(Outside) IG2 Relay Monitor(Outside) Latch Circuit ACC Relay Monitor	-

PROCEDURE

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM
1. Check the wireless door lock function by operating the electrical key transmitter sub-assembly.
  
  OK
  
  Wireless door lock function operates.
NG
GO TO OTHER FLOW CHART (All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate) Click here

OK

OK
Wireless door lock function operates.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Text in Illustration
*a	Rear view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

Disconnect the A72 certification ECU (Smart key ECU assembly) connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
A72-2 (+B) - Body ground	Power switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

CHECK HARNESS AND CONNECTOR (GROUND)

Text in Illustration
*a	Rear view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A72-11 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SMART ENTRY AND START SYSTEM

Remove the battery from the electrical key transmitter sub-assembly Click here.

Text in Illustration
*1	Power Switch
*2	Electrical Key Transmitter Sub-assembly

With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch and check if the power source mode changes.

OK
The power source mode changes.

Tech Tips

If the power source mode changes, the cabin verification is malfunctioning.

Result

Result	Proceed to
The power source mode does not change.	A
The power source mode changes.	B

READ VALUE USING GTS Click here

READ VALUE USING GTS

Connect the GTS to the DLC3.
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.

Power Source Control
Tester Display	Measurement Item/Range	Normal Condition	Specified Condition
Stop Light Switch1	State of brake pedal/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	Use this item to determine whether the stop light switch is malfunctioning. The hybrid control system cannot be started when this item is OFF. When this item is malfunctioning, the hybrid control system can be started by pressing and holding the power switch for a certain period of time.

OK
ON (brake pedal is depressed) and OFF (brake pedal is released) appear on the screen.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND) Click here

READ VALUE USING GTS

Read the Data List according to the display on the GTS.

Power Source Control
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Power Supply Condition	Power supply state/IG2 ON, ST ON, All OFF, IG1 ON or ACC ON	All OFF: Power switch off (ACC and IG) ACC ON: Power switch on (ACC) IG1 ON: Power switch on (IG) (IG1 relay on) IG2 ON: Power switch on (IG) (IG2 relay on) ST ON: Sending hybrid control system start request signal	Since the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

With the power switch off and brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch for 2 seconds or more and read the Data List.

OK

IG2 ON is displayed in the Data List.

Tech Tips

If the smart entry and start system function has been canceled on the customization menu, ACC ON is displayed in the Data List.

OK
IG2 ON is displayed in the Data List.

CHECK FOR DTC Click here

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Read the Data List according to the display on the GTS.
Measure the voltage according to the value(s) in the table below.

Text in Illustration

*a
Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

Text in Illustration
*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

Read the Data List according to the display on the GTS.

Power Source Control
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Power Supply Condition	Power supply state/IG2 ON, ST ON, All OFF, IG1 ON or ACC ON	All OFF: Power switch off (ACC and IG) ACC ON: Power switch on (ACC) IG1 ON: Power switch on (IG) (IG1 relay on) IG2 ON: Power switch on (IG) (IG2 relay on) ST ON: Sending hybrid control system start request signal	Since the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

Measure the voltage while checking the Data List on the GTS.

Standard Voltage

Tester Connection	Condition	Specified Condition
H194-6 (IG1D) - Body ground	Power switch off	1 V or less
	Power switch on (ACC)	1 V or less
	Power switch on (IG)	9 V or higher
A72-9 (IG2D) - Body ground	Power switch off	1 V or less
	Power switch on (ACC)	1 V or less
	Power switch on (IG)	9 V or higher
H194-4 (ACCD) - Body ground	Power switch off	1 V or less
	Power switch on (IG)	8.5 V or higher
	Power switch on (ACC)	8.5 V or higher

CHECK RELAY CONTACT SIDE CIRCUIT

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

READ VALUE USING GTS

Read the Data List according to the display on the GTS.

Power Source Control
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Start Switch1	Power switch 1 status/ON or OFF	ON: Power switch pressed OFF: Power switch not pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine whether the power switch input signal is malfunctioning.
Start Switch2	Power switch 2 status/ON or OFF	ON: Power switch pressed OFF: Power switch not 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.

OK
ON (Power switch is pressed) and OFF (Power switch is not pressed) appear on the screen.

Result

Result	Proceed to
NG	A
OK	B

GO TO OTHER FLOW CHART (Room Oscillator does not Recognize Key) Click here

INSPECT POWER SWITCH
1. Inspect the power switch Click here.
NG
REPLACE POWER SWITCH Click here

OK

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER SWITCH)

Disconnect the H194 certification ECU (smart key ECU assembly) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
H194-28 (SSW1) - H44-5 (SS1)	Always	Below 1 Ω
H194-30 (SSW2) - H44-1 (SS2)	Always	Below 1 Ω
H194-28 (SSW1) or H44-5 (SS1) - Body ground	Always	10 kΩ or higher
H194-30 (SSW2) or H44-1 (SS2) - Body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND)

Text in Illustration

*a
Front view of wire harness connector

(to Stop Light Switch Assembly)

Disconnect the A28 stop light switch assembly connector.

Text in Illustration
*a	Front view of wire harness connector (to Stop Light Switch Assembly)

Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
A28-1 (B) - A28-3 (GND)	Power switch off	11 to 14 V

Standard Resistance

Tester Connection	Condition	Specified Condition
A28-3 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK STOP LIGHT SWITCH ASSEMBLY

Text in Illustration

*a
Component with harness connected

(Stop Light Switch Assembly)

Reconnect the A28 stop light switch assembly connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
A28-2 (L) - A28-3 (GND)	Power switch off, brake pedal not depressed	Below 1 V
A28-2 (L) - A28-3 (GND)	Power switch off, brake pedal depressed	11 to 14 V

REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

Disconnect the A28 stop light switch assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
A72-18 (STP1) - A28-2 (L)	Always	Below 1 Ω
A72-18 (STP1) or A28-2 (L) - Body ground	Always	10 kΩ or higher

Reconnect the A28 stop light switch assembly connector.
Text in Illustration

*a
Rear view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

Disconnect the A72 certification ECU (Smart key ECU assembly) connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
A72-18 (STP1) - Body ground	Brake pedal released	1 V or less
A72-18 (STP1) - Body ground	Brake pedal depressed	9 V or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK FOR DTC

Enter the following menus:

for Smart Entry and Start System: Body Electrical / Entry&Start / Trouble Codes.

Check for DTCs.

Result

Proceed to

The following DTCs are not output:

B2785
B2784
B278A

The following DTCs are output:

B2784
B278A

DTC B2785 is output.

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

GO TO ENGINE IMMOBILISER SYSTEM

GO TO LIN COMMUNICATION SYSTEM