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Hazard & Headlight Switch Replacement
 
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Pelican Technical Article:

Hazard & Headlight Switch Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

Plastic prying tool, small flathead screwdriver

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Light bulb, hazard/door lock switch

Hot Tip:

Pry gently when removing switches so as to not mar the interior finish

Performance Gain:

Proper light function

Complementary Modification:

Clean spills from center console area

Z4 exterior bulbs are monitored by the Light Module (headlight switch, LM), which also monitors and controls instrument panel dimming.

Bulb monitoring by LM is done both cold and hot (unlit or lit). In cold monitoring, LM sends brief current pulses to unlit bulbs to measure their resistance. The pulses are too short to illuminate bulbs but serve the purpose of evaluating whether an individual bulb or bulb circuit is defective. In hot monitoring, LM measures the current to individual lit bulbs to determine overload or a break in the circuit.

The headlight switch and the hazard light are located in the center console. Trim pieces in BMW Z4, including the dashboard and switches, are made of hard plastic. Plastic clips or metal screws may be used to hold them in place. To avoid marring the trim, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out trim panels, switches or electrical accessories.

The hazard light and door lock switch are integrated into one unit. It is located in the center dashboard and can be changed easily. If the switch no longer lights up when the headlights are on, you can replace the bulb inside the switch once it is removed.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The hazard/door lock switch is located in the center console (red arrow).
Figure 1

The hazard/door lock switch is located in the center console (red arrow).

Using a plastic prying tool, lever the shift boot trim (red arrow) out of the center console.
Figure 2

Using a plastic prying tool, lever the shift boot trim (red arrow) out of the center console. You may even be able to pinch the shift boot and pull the trim piece straight out without prying.

Gently push out the switch (red arrow).
Figure 3

Gently push out the switch (red arrow). Be gentle when prying. Do not break the switch or push it too far. The electrical connector is still connected. Disconnect the electrical connector (blue arrow) by pulling it straight out of the switch. Remove the switch from the vehicle. To install a new switch, connect the electrical connector. Then check the function of the hazard lights and door locks via the switch. Then, press into the switch into the center console until it is fully seated.

To replace the bulb, using a small flathead screwdriver rotate the bulb holder 45° counterclockwise (red arrow).
Figure 4

To replace the bulb, using a small flathead screwdriver rotate the bulb holder 45° counterclockwise (red arrow). Remove the bulb with socket and replace (inset).



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Page last updated: Fri 12/9/2016 02:59:09 AM