Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 288

LIGHTING  –  LIGHTING SYSTEM

LI–49

LI

DESCRIPTION

This circuit detects the state of the headlight dimmer switch.

WIRING DIAGRAM

INSPECTION PROCEDURE

(a) Connect the intelligent tester with CAN VIM to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the intelligent tester on. 

Light Control Switch Circuit

1

READ VALUE OF INTELLIGENT TESTER

Headlight Dimmer Switch Assembly

To Headlight (High)

*1: w/o Daytime running light system

*2: w/ Daytime running light system

To Headlight (Low)

Dimmer Switch

Light Control Switch

HF

H

T

H

T

HU

HF

HU

HF

HU

EL

(*1)

(*1)

(*2)

EL

TAIL

HL

HU

HL

OFF

Tail

Head

Flash

Low

High

ED

HEAD

Main Body ECU

B136091E01

LI–50

LIGHTING  –  LIGHTING SYSTEM

LI

(d) Select the item(s) in the DATA LIST, and read the display 

on the intelligent tester.

BODY

OK:

Condition information can be displayed.

OK

NG

(a) Remove the headlight dimmer switch assembly.
(b) Measure the resistance.

(1) Light Control Switch:

Standard resistance

(2) Headlight Dimmer Switch Switch:

Standard resistance

(c) Reinstall the headlight dimmer switch assembly.

Item

Measurement Item / Display 

(Range)

Normal Condition

Diagnostic Note

HIGH FLASER SW

Passing light switch signal / 

ON or OFF

ON: Headlight dimmer switch 
is in FLASH (PASS) position
OFF: Headlight dimmer switch 
is not in FLASH (PASS) 
position

-

DIMMER SW

Dimmer switch signal/ON or 

OFF

ON: Dimmer switch is ON (High 
Beam) or High flasher switch is 
ON
OFF: Dimmer switch is OFF 
(Low Beam) or High flasher 
switch is OFF

-

HEAD LIGHT SW

Headlight control switch signal 

/ ON or OFF

ON: Light control switch is in 
HEAD position
OFF: Light control switch is not 
in HEAD position

-

TAIL LIGHT SW

Taillight switch signal / ON or 

OFF

ON: Light control switch is in 
TAIL or HEAD position
OFF: Light control switch is in 
OFF position

-

PROCEED TO NEXT CIRCUIT INSPECTION 
SHOWN IN PROBLEM SYMPTOMS TABLE

2

INSPECT HEADLIGHT DIMMER  SWITCH ASSEMBLY

Component Side:

HL

HF

HU

EL

T

H

Headlight Dimmer Switch

B136086E02

Tester Connection

Condition 

Specified Condition

14 (T) - 16 (EL)

OFF

10 k

Ω or higher

13 (H) - 16 (EL)

14 (T) - 16 (EL)

TAIL

Below 1 

Ω

13 (H) - 16 (EL)

10 k

Ω or higher

14 (T) - 16 (EL)

HEAD

Below 1 

Ω

13 (H) - 16 (EL)

Below 1 

Ω

Tester Connection

Condition 

Specified Condition

7 (HU) - 16 (EL)

HIGH BEAM

Below 1 

Ω

17 (HL) - 16 (EL)

LOW BEAM

Below 1 

Ω

7 (HU) - 8 (HF) - 16 (EL)

FLASH

Below 1 

Ω

LIGHTING  –  LIGHTING SYSTEM

LI–51

LI

NG

OK

(a) Disconnect the E8 main body ECU connector.
(b) Disconnect the E20 headlight dimmer switch assembly 

connector.

(c) Measure the resistance.
Standard resistance

HINT:
*: w/ Daytime running light system
(d) Reconnect the main body ECU connector.
(e) Reconnect the headlight dimmer switch assembly 

connector.

NG

OK

HINT:
*: w/o Daytime running light system

REPLACE HEADLIGHT DIMMER  SWITCH 
ASSEMBLY

3

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER  SWITCH  - MAIN BODY 
ECU)

23

22

26

18

10

7

25

13 14

16 17

19

8

20

9

11 12

15

24

21

1

2

3

4

5

6

Wire Harness Side:

HF

EL

HU

HU

H

HF

TAIL

HEAD

T

Main Body ECU Connector

Front View

Front View

Headlight Dimmer Switch Assembly 
Connector

E20

E8

B138177E01

Tester Connection

Specified Condition

E20-8 (HF) - E8-7 (HF)

Below 1 

Ω

E20-8 (HF) or E8-7 (HF) - Body 

ground

10 k

Ω or higher

E20-14 (T) - E8-8 (TAIL)

Below 1 

Ω

E20-14 (T) or E8-8 (TAIL) - Body 

ground

10 k

Ω or higher

E20-13 (H) - E8-1 (HEAD)

Below 1 

Ω

E20-13 (H) or E8-1 (HEAD) - Body 

ground

10 k

Ω or higher

E20-7 (HU) - E8-2 (HU)*

Below 1 

Ω

E20-7 (HU) or E8-2 (HU)* - Body 

ground

10 k

Ω or higher

E20-16 (EL) - Body ground

Below 1 

Ω

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

4

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER  SWITCH  - HEADLIGHT*)

LI–52

LIGHTING  –  LIGHTING SYSTEM

LI

(a) Disconnect the E20 headlight dimmer switch assembly 

connector.

(b) Disconnect the A23 and A24 headlight connectors.
(c) Measure the resistance.
Standard resistance

(d) Reconnect the headlight dimmer switch assembly 

connector.

(e) Reconnect the headlight connectors.

NG

OK

Wire Harness Side:

HL

HU

Headlight Connector

Front View

Front View

Headlight dimmer Switch Assembly 
Connector

*1: LH

*2: RH

E20

A23

A24

*

1

*

2

B138178E01

Tester Connection

Specified Condition

E20-17 (HL) - A23-1

Below 1 

Ω

E20-17 (HL) - A24-1

Below 1 

Ω

E20-7 (HU) - A23-2

Below 1 

Ω

E20-7 (HU) - A24-2

Below 1 

Ω

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE