Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Inspection

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Lighting (ext) / Headlight Dimmer Switch / Inspection

INSPECTION

PROCEDURE

1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

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

Standard Resistance:

Light Control Switch

Tester Connection

Condition

Specified Condition

18 (T) - 15 (EL)

Light control switch in DRL OFF position*1

10 kΩ or higher

19 (H) - 15 (EL)

Light control switch in DRL OFF position*1

10 kΩ or higher

20 (A) - 15 (EL)

Light control switch in DRL OFF position*1

10 kΩ or higher

18 (T) - 15 (EL)

Light control switch in tail position

Below 1 Ω

18 (T) - 15 (EL)

Light control switch in head position

Below 1 Ω

19 (H) - 15 (EL)

Light control switch in head position

Below 1 Ω

20 (A) - 15 (EL)

Light control switch in AUTO position

Below 1 Ω
Dimmer Switch

Tester Connection

Condition

Specified Condition

16 (HL) - 15 (EL)

Dimmer switch in low position

Below 1 Ω

14 (HU) - 15 (EL)

Dimmer switch in high or high flash position

Below 1 Ω

17 (HF) - 15 (EL)

Dimmer switch in high flash position

Below 1 Ω
Turn Signal Switch

Tester Connection

Condition

Specified Condition

12 (TR) - 15 (EL)

Turn signal switch in neutral position

10 kΩ or higher

11 (TL) - 15 (EL)

Turn signal switch in neutral position

10 kΩ or higher

13 (CR) - 15 (EL)

Turn signal switch in neutral position

10 kΩ or higher

12 (TR) - 15 (EL)

Turn signal switch in right turn position

Below 1 Ω

13 (CR) - 15 (EL)

Turn signal switch in full right turn position

Below 1 Ω

11 (TL) - 15 (EL)

Turn signal switch in left turn position

Below 1 Ω

13 (CR) - 15 (EL)

Turn signal switch in full left turn position

Below 1 Ω
Fog Light Switch *2

Tester Connection

Condition

Specified Condition

8 (LFG) - 9 (BFG)

Fog light switch off

10 kΩ or higher

8 (LFG) - 9 (BFG)

Fog light switch in front position

Below 1 Ω
  • *1: w/ Light Control Switch DRL OFF Position
  • *2: w/ Fog Light

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

*a

Component without harness connected

(Headlight Dimmer Switch Assembly)
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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