Toyota Tundra Service Manual: Inspection

Toyota Tundra Service Manual / Vehicle Interior / Lighting / Headlight Dimmer Switch / Inspection

INSPECTION

PROCEDURE

1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

(a) Inspect the light control switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

20 (H) - 12 (EL)

Light control switch off or DRL OFF

10 kΩ or higher

18 (T) - 12 (EL)

19 (A) - 12 (EL)

18 (T) - 12 (EL)

Light control switch tail

Below 1 Ω

18 (T) - 12 (EL)

Light control switch head

Below 1 Ω

20 (H) - 12 (EL)

19 (A) - 12 (EL)

Light control switch auto

Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a

Component without harness connected

(Headlight Dimmer Switch Assembly)

(b) Inspect the headlight dimmer switch.

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

HINT:

Perform the flash, high beam and low beam inspections with the light control switch on head.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

11 (HU) - 12 (EL)

Headlight dimmer switch flash

Below 1 Ω

17 (HF) - 12 (EL)

11 (HU) - 12 (EL)

Headlight dimmer switch hi beam

Below 1 Ω

16 (HL) - 12 (EL)

Headlight dimmer switch low beam

Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a

Component without harness connected

(Headlight Dimmer Switch Assembly)

(c) Inspect the turn signal switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

13 (TR) - 12 (EL)

15 (TL) - 12 (EL)

14 (CR) - 12 (EL)

Turn signal switch neutral

10 kΩ or higher

13 (TR) - 12 (EL)

Turn signal switch right turn

Below 1 Ω

13 (TR) - 12 (EL)

11 (TL) - 14 (CR)

14 (CR) - 12 (EL)

Turn signal switch right lane change

Below 1 Ω

15 (TL) - 12 (E)

Turn signal switch left turn

Below 1 Ω

15 (TL) - 12 (EL)

15 (TL) - 14 (CR)

14 (CR) - 12 (EL)

Turn signal switch left lane change

Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a

Component without harness connected

(Headlight Dimmer Switch Assembly)

(d) Inspect the front fog light switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

3 (LFG) - 4 (BFG)

Front fog light switch off

10 kΩ or higher

3 (LFG) - 4 (BFG)

Front fog light switch on

Below 1 Ω

If the result is not as specified, replace the headlight dimmer switch assembly.

Text in Illustration

*a

Component without harness connected

(Headlight Dimmer Switch Assembly)
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