Toyota CH-R Service Manual: 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.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Power source mode does not change to on (IG) but does change to on (ACC)

Power Source Control
  • Power Supply Condition
  • IG Relay Monitor (Inside)
  • IG Relay Monitor (Outside)
  • IG Circuit
Starting Control
  • Ignition

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key 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 Diagnostic Trouble Code Chart.
  • If the smart key system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly), refer to smart key system (for Start Function) Precaution.

    Click here

  • After completing repairs, confirm that the problem does not recur.

HINT:

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

1.

CHECK FOR DTC

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

Body Electrical > Power Source Control > Trouble Codes Body Electrical > Smart Key > Trouble Codes Body Electrical > Starting Control > Trouble Codes

Result

Proceed to

DTCs are not output

A

Smart key system (for Start Function) DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

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

(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the 3A and 3D instrument panel junction block assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F1-17 (IG1D) - 3A-17

Always

Below 1 Ω

3D-3 - Body ground

Always

Below 1 Ω

F1-17 (IG1D) or 3A-17 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 1 INTEGRATION RELAY)

(a) Disconnect the 1A No. 1 integration relay connector.

(b) Disconnect the 3F instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-2 - 3F-12

Always

Below 1 Ω

1A-7 - 3F-13

Always

Below 1 Ω

1A-2 or 3F-12 - Body ground

Always

10 kΩ or higher

1A-7 or 3F-13 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1-NO. 1, IG1-NO. 2, IG2-NO. 2 RELAY)

(a) Remove the instrument panel junction block assembly.

Click here

(b) 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

3A-17 - 3D-3

20°C (68°F)

85.69 to 124.1 Ω

3K-1 - 3F-10

Battery voltage applied between terminals 3A-17 and 3D-3

Below 1 Ω

Battery voltage not applied between terminals 3A-17 and 3D-3

10 kΩ or higher

3K-1 - 3H-12

Battery voltage applied between terminals 3A-17 and 3D-3

Below 1 Ω

Battery voltage not applied between terminals 3A-17 and 3D-3

10 kΩ or higher

3L-1 - 3D-19

Battery voltage applied between terminals 3A-17 and 3D-3

Below 1 Ω

Battery voltage not applied between terminals 3A-17 and 3D-3

10 kΩ or higher

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

5.

INSPECT NO. 1 INTEGRATION RELAY (IG1 NO. 3, IG2 NO. 1 RELAY)

(a) Remove the No. 1 integration relay.

Click here

(b) Inspect the No. 1 integration relay.

Click here

NG

REPLACE NO. 1 INTEGRATION RELAY

OK

6.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly connector.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3A-17 - 3F-12

Always

Below 1 Ω

3A-17 - 3F-13

Always

Below 1 Ω

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

7.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the F1 certification ECU (smart key ECU assembly) connector.

(b) Install the instrument panel junction block assembly.

Click here

(c) Install the No. 1 integration relay.

Click here

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F1-17 (IG1D) - Body ground

Engine switch on (ACC) → Engine switch on (IG)

1 V or less → 9 V or higher

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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