Toyota CH-R Service Manual: Security Indicator Light Does not Blink

DESCRIPTION

The certification ECU (smart key ECU assembly) blinks the security indicator light (clock assembly) when the immobiliser is set (engine switch off).

WIRING DIAGRAM

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.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Smart Key > Trouble Codes

OK:

DTCs are not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM (IMMOBILISER INDICATOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Smart Key > Active Test

Tester Display

Measurement Item

Type

Diagnostic Note

Immobiliser Indicator

Security indicator light

OFF/ON

-

Body Electrical > Smart Key > Active Test

Tester Display

Immobiliser Indicator

OK:

The security indicator light (clock assembly) operates normally.

NG

GO TO STEP 4

OK

3.

CHECK SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY)

(a) When the immobiliser is set, check that the security indicator light (clock assembly) blinks.*1

OK:

The security indicator light (clock assembly) blinks normally.

(b) When the theft deterrent system is in the arming preparation state, check that the security indicator light (clock assembly) illuminates.*2

OK:

The security indicator light (clock assembly) illuminates normally.

Result

Proceed to

*1 is NG (*2 is OK)

A

*2 is NG (*1 is OK)

B

A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY))

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

(b) Disconnect the F81 security indicator light (clock assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F1-20 (IND) - F81-9 (LP)

Always

Below 1 Ω

F1-20 (IND) or F81-9 (LP) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

(b) Reconnect the F81 security indicator light (clock assembly) connector.

(c) Using an oscilloscope, check the waveform.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

-

-

Measurement Condition:

Tester Connection

Switch Condition

Specified Condition

F1-20 (IND) - Body ground

Engine switch off → on (IG)

Pulse generation → Below 2 V

OK

REPLACE SECURITY INDICATOR LIGHT (CLOCK ASSEMBLY)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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