Toyota Tundra Service Manual: 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)	Light control switch head	Below 1 Ω
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)	Headlight dimmer switch flash	Below 1 Ω
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)

(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)

Toyota Tundra Service Manual > Vehicle Stability Control System: Center Differential Lock Circuit (C1340)
DESCRIPTION The skid control ECU monitors the 2WD/4WD state from both the 4 wheel drive control ECU and the A.D.D. detection switch. DTC No. Detection Item DTC Detection Condition Trouble Area C1340 Center Differential Lock Circuit On a 4WD vehicle, a normal A.D.D. detection switch signal is input v ...

Toyota Tundra Owners Manual