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

DTC Code	DTC Name
	Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

Table 1. Related Data List and Active Test Items
Problem Symptom	Data List Item	Active Test Item
Power source mode does not change to on (IG) but does change to on (ACC)	Power Source Control Power Supply Condition IG1 Relay Monitor (Inside) IG2 Relay Monitor (Inside) IG1 Relay Monitor (Outside) IG2 Relay Monitor (Outside) IG1 Circuit IG2 Circuit	-

WIRING DIAGRAM

Refer to "Power Source Mode does not Change to on (IG and ACC)".

Click here

CAUTION / NOTICE / HINT

Note:

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 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 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. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.
Click here
Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.
Click here Click here Click here
If the entry and start system is disabled through the customize function, enable the system before performing troubleshooting.
Click here
Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Start Function) precaution.
Click here
Inspect the fuses of circuits related to this system before performing the following procedure.
After completing repairs, confirm that the problem does not occur.

Tip:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INTEGRATION RELAY)

Disconnect the E33 certification ECU (smart key ECU assembly) connector.
Remove the IG2 relay.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
E33-9 (IG2D) - 1	Always	Below 1 Ω
2 - Body ground	Always	Below 1 Ω
E33-9 (IG2D) or 1 - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

INSPECT IG2 RELAY

Remove the IG2 relay.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

Result


Proceed to
OK
NG

NG

REPLACE IG2 RELAY

OK

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

Disconnect the E35 certification ECU (smart key ECU assembly) connector.
Disconnect the 3D and 3C instrument panel junction block assembly connectors.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
E35-6 (IG1D) - 3D-24	Always	Below 1 Ω
3C-9 - Body ground	Always	Below 1 Ω
E35-6 (IG1D) or 3D-24 - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAY)

Remove the instrument panel junction block assembly.
Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

*a	Component without harness connected (Instrument Panel Junction Block Assembly)	-	-

Standard Resistance


Tester Connection	Condition	Specified Condition
3B-1 - 3A-38 (IG1 NO. 1 relay) 3B-1 - 3E-4 (IG1 NO. 2 relay) 3B-1 - 3D-30 (IG1 NO. 3 relay)	Battery voltage not applied to terminals 3D-24 and 3C-9	10 kΩ or higher
	Battery voltage applied to terminals 3D-24 and 3C-9	Below 1 Ω

Result


Result	Proceed to
OK	A
NG (for LHD)	B
NG (for RHD)	C

B

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click here

C

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click here

A

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	-	-

Standard Voltage


Tester Connection	Condition	Specified Condition
E33-9 (IG2D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher
E35-6 (IG1D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher

Result


Proceed to
OK
NG

OK

CHECK RELAY CONTACT SIDE CIRCUIT

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)