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INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU, RUNNING LIGHT RELAY)

Wire Harness Side:

Main Body ECU Connector

Front View Running Light Relay Connector

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IrNm

1 1 I 2

3

5

6

7 8

9

10

11

12

3 14

15

6 17

18

19

Front View

P=

r5—1'i

X

=q

1 1

2

3

4

5

6 i1

1 7

8

9

10

11

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Front View

B144229E01

(a) Disconnect the 4J and 4S main body ECU connectors.*1

(b) Disconnect the 4J , 4E and 4M main body ECU connectors.*2

(c) Disconnect the D9 running light relay assembly connector.*3

HINT:

*1: Hatchback, Sedan with front fog light *2: Sedan without front fog light *3: w/ Daytime running light system

(d) Measure the resistance.

Standard resistance

Tester connection

Condition

Specified Condition

4J-3 - Body ground

Light control switch OFF ^ HEAD Headlight dimmer switch LOW position

10 kQ or higher ^ Below 1 Q

4J-4 - Body ground

Light control switch OFF ^ HEAD Headlight dimmer switch HIGH position

10 kQ or higher ^ Below 1 Q

4J-4 - Body ground

Light control switch HIGH position

10 kQ or higher ^ Below 1 Q

4S-9 - Body ground*1

Light control switch OFF ^ TAIL

10 kQ or higher ^ Below 1 Q

4S-9 - Body ground*1

Light control switch OFF ^ HEAD

10 kQ or higher ^ Below 1 Q

4E-10 - 4M-4*2

Light control switch OFF ^ TAIL

10 kQ or higher ^ Below 1 Q

4E-10 - 4M-4*2

Light control switch OFF ^ HEAD

10 kQ or higher ^ Below 1 Q

4M-9 - Body ground*2

Front fog light switch OFF ^ ON

10 kQ or higher ^ Below 1 Q

D9-7 - Body ground*3

Light control switch OFF ^ HEAD

10 kQ or higher ^ Below 1 Q

HINT:

*1: Hatchback, Sedan with front fog light *2: Sedan without front fog light

*3: w/ Daytime running light system

(e) Reconnect the main body ECU connectors.

(f) Reconnect the running light relay assembly connector* HINT:

*: w/ Daytime running light system

Go to step 2

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT HEADLIGHT DIMMER SWITCH

Toyota Yaris Srodek

(a) Inspect the light control switch. (1) Measure the resistance. Standard resistance

Tester Connection

Condition

Specified Condition

10 (T1) - 13 (B1)

TAIL

Below 1 Q

10 (T1) - 13 (B1)

OFF

10 kQ or higher

10 (T1) - 13 (B1)

HEAD

Below 1 Q

10 (T1)- 13 (B1)

OFF

10 kQ or higher

11 (ED)- 12 (RF)

HEAD

Below 1 Q

11 (ED)- 12 (RF)

OFF

10 kQ or higher

(b) Inspect the headlight dimmer switch. (1) Measure the resistance. Standard resistance

E123011E01

Tester Connection

Condition

Specified Condition

9 (HU) - 11 (ED)

FLASH

Below 1 Q

8 (HL) - 11 (ED)

LOW BEAM

Below 1 Q

9 (HU) - 11 (ED)

HI BEAM

Below 1 Q

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