Toyota Tundra Service Manual: Headlight Dimmer Relay

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT HEADLIGHT DIMMER RELAY

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

(b) Check the resistance.

(1) 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

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

(c) Install the headlight dimmer relay to the engine room relay box.

    Removal

    Headlight Dimmer Switch

    See More:

    Toyota Tundra Service Manual > Steering System: Precaution
    PRECAUTION 1. HANDLING PRECAUTIONS FOR STEERING SYSTEM (a) The vehicle is equipped with an SRS (Supplemental Restraint System) such as airbags. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing. This may cause a serious accide ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2025 Copyright www.ttundra.com
    0.0091