Toyota Tundra (2015 year). Manual - part 2103

OK

OK

(a) Remove the headlight relay from the engine room relay block.

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

below.

Standard resistance:

TESTER

CONNECTION

CONDITION

SPECIFIED

CONDITION

3 - 5

When battery voltage is not

applied to terminals 1 and 2

10 kΩ or higher

When battery voltage is applied

to terminals 1 and 2

Below 1 Ω

NG

REPLACE HEADLIGHT RELAY

5.

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD] - BATTERY)

(a) Remove the headlight relay from the engine room relay block.

(b) Measure the voltage according to the value(s) in the table

below.

Standard voltage:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

Headlight dimmer relay terminal 1 -

Body ground

Always

11 to 14 V

Headlight dimmer relay terminal 3 -

Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...

OK

6.

INSPECT HEADLIGHT DIMMER RELAY (DIM)

(a) Remove the headlight dimmer relay from the engine room

relay block.

(b) 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

Battery voltage applied to

terminals 1 and 2

Below 1 Ω

3 - 4

Battery voltage not applied to

terminals 1 and 2

Below 1 Ω

Battery voltage applied to

terminals 1 and 2

10 kΩ or higher

NG

REPLACE HEADLIGHT DIMMER RELAY

7.

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY [DIM] - BATTERY)

(a) Remove the headlight relay from the engine room relay block.

(b) Measure the voltage according to the value(s) in the table

below.

Standard voltage:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

Headlight relay terminal

1 - Body ground

Light control switch

HEAD, dimmer switch

Low

11 to 14 V

LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...

OK

OK

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

Headlight relay terminal

3 - Body ground

Light control switch

HEAD, dimmer switch

Low

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD] - HEADLIGHT DIMMER
RELAY [DIM])

(a) Remove the headlight relay from the engine room relay block.

(b) Remove the headlight dimmer relay from the engine room

relay block.

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

below.

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

Headlight relay terminal 5 - Headlight

dimmer relay terminal 3

Always

Below 1 Ω

Headlight relay terminal 5 - Body

ground

Always

10 kΩ or higher

Headlight dimmer relay terminal 3 -

Body ground

Always

10 kΩ or higher

Headlight relay terminal 5 - Headlight

dimmer relay terminal 1

Always

Below 1 Ω

Headlight dimmer relay terminal 1-

Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...

OK

9.

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY [DIM] - HEADLIGHT
LOW BULB)

*1: for LH

*2: for RH

(a) Remove the headlight dimmer relay from the engine room relay block.

(b) Disconnect the A8*1 and A9*2 headlight connectors.

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

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

Headlight dimmer relay terminal 4 - A8-1 (LO)*1

Always

Below 1 Ω

Headlight dimmer relay terminal 4 - Body ground*1

Always

10 kΩ or higher

Headlight dimmer relay terminal 4 - A9-1 (LO)*2

Always

Below 1 Ω

Headlight dimmer relay terminal 4 - Body ground*2

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

CHECK HEADLIGHT (LOW BEAM)

LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...