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Hazard & Lock Switch Replacement
 

Pelican Technical Article:

Hazard & Lock Switch Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

Plastic prying tool, small flathead screwdriver

Applicable Models:

BMW X3 Sport Utility (2004-10)

Parts Required:

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

BMW X3 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 door lock and the hazard light are located in the instrument panel. Trim pieces in BMW X3, 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 cancan be changed fairly easily. If the switch no longer lights up when the headlights are on, you will have to replace it, as X3 models do not have a serviceable bulb.

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 of the instrument panel (red arrow).
Figure 1

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

Using a plastic prying tool, lever the bottom of the center HVAC vents out of the instrument panel (red arrows).
Figure 2

Using a plastic prying tool, lever the bottom of the center HVAC vents out of the instrument panel (red arrows). Start at one side and work your way across the bottom of the vent. Gently pull the vents out and down toward center console (red arrow). Pull the vent assembly out far enough to reach the Bowden cable (blue arrow).

Gently pull the vents out and down toward center console (red arrow).
Figure 3

Gently pull the vents out and down toward center console (red arrow). Pull the vent assembly out far enough to reach the Bowden cable (blue arrow).

Pull the Bowden cable toward the right side of the vehicle to unclip the plastic collar (red arrow).
Figure 4

Pull the Bowden cable toward the right side of the vehicle to unclip the plastic collar (red arrow). Then lift it up to remove cable from mount.

Pull the Bowden cable end off the vent lever (blue arrow) and lay the cable aside.
Figure 5

Pull the Bowden cable end off the vent lever (blue arrow) and lay the cable aside.

Rotate the vent 90 degrees and move it toward the instrument panel.
Figure 6

Rotate the vent 90 degrees and move it toward the instrument panel. This allows slack on the switch harness. Press the switch out from behind the vent assembly (red arrow). Then disconnect the electrical connector (blue arrow) by pulling it straight out. When installing new switch, install electrical connector. Then, press it into the vent assembly. Reverse remaining steps to reassemble vent assembly.


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Page last updated: Wed 12/13/2017 03:15:12 AM