2003 - 2005 BMW Z4 Occupant Detection Control Module (OEM)

• What to look for when buying this part:
• Make sure it's the correct part for your specific BMW model and year.
• Check the part's condition (if buying used).
• Verify the seller offers a warranty or return policy.

• Quality indicators for the available options:
• Used OEM: Look for parts that have been tested and inspected. Check for signs of damage or corrosion.
• New Aftermarket: Choose reputable brands known for quality. Read reviews from other buyers.

• What's typically included with the part:
• The Occupant Detection Control Module itself.
• Sometimes, mounting hardware (check with the seller).
• Installation instructions are usually not included.

• Difficulty level and estimated time:
• Difficulty: Medium
• Estimated time: 1-2 hours

• Special tools needed (if any):
• Socket set
• Screwdrivers
• Multimeter (optional, for testing)
• Diagnostic scan tool (for clearing error codes)

• Critical steps and tips:

1. Disconnect the negative battery cable before starting.
2. Locate the Occupant Detection Control Module (usually under the passenger seat).
3. Disconnect the wiring harness from the old module.
4. Remove the old module and install the new one.
5. Reconnect the wiring harness.
6. Reconnect the negative battery cable.
7. Use a diagnostic scan tool to clear any error codes.

• Whether DIY is recommended or professional installation is better:
• DIY is possible for experienced mechanics.
• Professional installation is recommended if you're not comfortable working with electrical systems or airbags.

• Compare: Used OEM, New Aftermarket

• Used OEM: Best value - genuine factory parts, tested and inspected, at significantly lower prices. You get the same quality as the original part, but at a fraction of the cost.

• New Aftermarket: Brand new third-party parts built to OE specs. These are a good option if you want a new part and don't mind it not being the original manufacturer's part.

• Parts commonly replaced or checked at the same time:
• Seat occupancy sensor
• Airbag control module
• Wiring harness

• Why replacing related parts prevents repeat failures:
• If the seat occupancy sensor is faulty, it can damage the Occupant Detection Control Module.
• A damaged wiring harness can cause electrical problems that affect the module.
• Replacing these parts together ensures the entire system is working correctly and prevents future issues.

• How long this part normally lasts:
• 7-10 years

• Factors that affect longevity:
• Exposure to moisture or extreme temperatures.
• Electrical surges or shorts.
• Physical damage from accidents.
• Quality of the replacement part.

• Budget vs mid-range vs premium options:
• Used OEM: $50 - $150
• New Aftermarket: $100 - $300
• Labor cost considerations if applicable:
• Professional installation: $100 - $300

• Total job cost estimates:
• DIY with Used OEM: $50 - $150
• DIY with New Aftermarket: $100 - $300
• Professional installation with Used OEM: $150 - $450
• Professional installation with New Aftermarket: $200 - $600

• Known issues for this vehicle's system related to this part:
• Some models have issues with the seat occupancy sensor causing the Occupant Detection Control Module to fail.
• Water leaks into the passenger compartment can damage the module.

• Any TSBs or common complaints:
• Check online forums and technical service bulletins (TSBs) for any known issues related to this part and your specific BMW model.

• How to confirm proper operation:
• Start the engine and check the airbag warning light. It should turn off after a few seconds.
• Have a passenger sit in the seat and verify that the passenger airbag is enabled.
• Use a diagnostic scan tool to check for any error codes.

• What to look/listen for to verify it's working correctly:
• The airbag warning light should remain off during normal driving.
• The passenger airbag should deploy in the event of an accident (this cannot be tested without causing an accident).
• No error codes related to the occupant detection system should be present.

• Q: Will this part need to be programmed after installation?
• A: In some cases, yes. You may need to have the module programmed to your vehicle using a diagnostic scan tool. Check with a qualified mechanic or BMW specialist.

• Q: How do I know if this part is compatible with my BMW?
• A: Make sure the part is specifically listed as compatible with your BMW's year, model, and submodel.

• Q: What does this module do?
• A: This module detects if someone is sitting in the passenger seat and controls whether the passenger airbag is enabled or disabled.

• Q: Can I replace this part myself?
• A: If you have experience working on cars and are comfortable with electrical systems, you can replace it yourself. Otherwise, professional installation is recommended.

• Q: What happens if I don't replace this part when it fails?
• A: The passenger airbag may not deploy in an accident, which could result in serious injury.

OEM Part Numbers:

• BMW: 65-77-6-927-500, 65776927500

Fits Years: 2003 2004 2005