How a Multifunction Switch Works and the Symptoms When It Fails

About this video

What does a multifunction switch do, and what happens when it starts to fail? In this video, an ASE certified mechanic explains how the multifunction switch works, what it controls, and the symptoms to look for when it goes bad. This is a general guide that applies to most makes and models, including Honda, Toyota, Ford, Chevrolet, Nissan, Hyundai, Kia, Jeep, Dodge, BMW, and Mercedes-Benz.

The multifunction switch is also known as the combination switch, turn signal switch, stalk switch, or wiper switch. It mounts on the steering column and handles many of the controls you use every time you drive.

WHAT WE COVER
What the multifunction switch is and where it is located on the steering column
The functions it controls, such as turn signals, headlights, high beams, flash to pass, wipers, washer spray, and on some vehicles the fog lights and cruise control
How the switch works on the inside and why the contacts wear out over time
Why the problem is often intermittent and how a failing switch is diagnosed

SYMPTOMS OF A BAD MULTIFUNCTION SWITCH
Turn signals that do not work at all, work only on one side, or only work while you hold the lever
Turn signal that does not cancel after you complete a turn
High beams that will not turn on or get stuck on
Flash to pass feature not working
Wipers stuck on one speed, not shutting off, or not working at all
Windshield washer not spraying when you pull the lever
Headlights or parking lights flickering or cutting out when you move the stalk
Functions that come and go when you wiggle the lever

RELATED FAULT CODES AND WARNING LIGHTS
A worn multifunction switch usually does not turn on the check engine light. On many newer vehicles the switch works together with the steering column control module (SCCM) and the body control module, so a scan tool may show body B codes or communication U codes stored for the turn signal, wiper, or headlight circuits. Fast flashing turn signals are usually a bulb issue, but a faulty switch can cause similar behavior.

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