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Front Seat Belt Buckle Replacement
 
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Pelican Technical Article:

Front Seat Belt Buckle Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$150

Talent:

***

Tools:

Sockets 16mm, T50 Torx socket, flathead screwdriver

Applicable Models:

BMW X5 (2000-06)

Parts Required:

Seat belt buckle and blue Loctite

Hot Tip:

Have a friend around to help lift seat

Performance Gain:

Remedy fault code for seat belt pretensioner

Complementary Modification:

Clean under seat

The seat belt buckle has a device built into it to cinch the seat belt tight in the event of a crash. This is called the seat belt pretensioner. Pretensioners can fail over time and will set a fault code in the airbag control module. If a fault code (possible fault code 112) is set, the airbag warning light will illuminate. To replace this part you have to remove the front seat to access the fastener and wiring harness. If your airbag light is ON, you will need a code reader or scan tool to determine what fault code is stored. If you find you have a pretensioner fault code, this is a good place to start. You will also need to clear the fault code once the part is replaced. Simply replacing the part will not turn off the airbag warning light. Another issue with X5 seat belt buckles, is the buckle will not lock the seat belt in. If you try to latch your belt and it will not stay, you likely need a new seat belt buckle.

Start by removing the fasteners and disconnecting the electrical connector on the seat you need to replace the buckle on. Then, slide the seat toward the rear seat, just far enough to access the belt buckle fastener. You can leave the seat belt attached to the seat, as you do not have to remove the seat from the vehicle. See our tech article on Seat removing.

With the seat moved back into the rear foot area, disconnect the seat belt pretensioner electrical connector (yellow arrow) by pulling it straight up.
Figure 1

With the seat moved back into the rear foot area, disconnect the seat belt pretensioner electrical connector (yellow arrow) by pulling it straight up. If needed, use a small flathead screwdriver to lever the connector off the pretensioner. Then remove the seat belt buckle fastener using a T50 Torx (green arrow). This fastener uses blue Loctite. If you are not replacing the bolt, be sure to apply new Loctite.

Slide the seat forward, then tilt the seat backward to expose the seat's electrical connector.
Figure 2

Slide the seat forward, then tilt the seat backward to expose the seat's electrical connector. Remove the electrical connector from the seat by unlocking the sliding tab (green arrow) using a flathead screwdriver and then slide the connector out (yellow arrow) of the sliding lock to remove it.

Next, you have to remove the seat belt connector from the main seat connector.
Figure 3

Next, you have to remove the seat belt connector from the main seat connector. Slide the electrical connector off the mounting bracket in the direction of the green arrow. Then pull the seat belt buckle connector (red arrow) straight out of the main connector to remove it.

Install the new seat belt buckle and tighten the fastener.
Figure 4

Install the new seat belt buckle and tighten the fastener. If you're reusing the fastener put a small amount of blue Loctite on the threads. Check that the seat belt buckle cutout (yellow arrow) is engaged with the steel dowel on the seat (green arrows). Be sure to properly route the wiring harness and confirm that the pretensioner electrical connector is properly seated. Reconnect the electrical connectors. Install the seat and seat belt fasteners and tighten. If you had a fault code for the pretensioner, now is the time to clear it.

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Page last updated: Mon 1/16/2017 02:42:40 AM