Whether your an expert BMW 540i car alarm installer, BMW 540i performance fan or a novice BMW 540i enthusiast with a 1998 BMW 540i, a BMW 540i car alarm wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car alarm, car security, car remote start, automatic remote starter, shock sensor, tilt sensor, car alarm sensor or any auto alarm is identifying the correct color car security wires for a 1998 BMW 540i headlight bulb size you need for your low beam or high beam and save time. Also, find your other car light bulb sizes including your fog light, reverse light, turn signal, brake light and more. It’s that easy!
The Modified Life staff has taken all its BMW 540i car alarm wiring diagrams, BMW 540i car security wiring diagrams, BMW 540i car alarm wire diagrams, BMW 540i car security wiring schematics, BMW 540i car security diagrams, BMW 540i remote starter wiring diagrams and cataloged them online for our visitors to use for free. Our automotive wiring diagrams allow you to enjoy your new auto security electronics rather than spend countless hours trying to figure out which wires goes where.
Feel free to use any BMW 540i auto alarm wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind and most of the auto security wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1998 BMW 540i.
If you have any questions pertaining to the car wiring in a 1998 BMW 540i, please feel free to post it at the bottom of this page and either we’ll do our best to find you the information you need or hopefully someone in the Modified Life community will have the information you are looking for.
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1998 BMW 540i Car Alarm Wiring Color Codes
Battery Constant 12v+ Positive Wire (+): Red
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): Black/Yellow
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire (+): Green
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire (+): Purple
Second Ignition Positive Wire Location: Ignition Switch Harness
Power Door Lock Positive Wire (+): Blue/Red
Power Door Lock Positive Wire Location: At Door Module In Driver Door
Power Door Unlock Positive Wire (+): Black/White (Requires Double Pulse)
Power Door Unlock Positive Wire Location: At Door Module In Driver Door
Door Trigger Negative Wire (-): Blue/Red
Door Trigger Negative Wire Location: At Dome Light
Domelight Supervision Wire: Turns On With Unlock
Domelight Supervision Wire Location: N/A
Trunk Release Negative Wire (-): Gray/Black
Trunk Release Negative Wire Location: At Trunk Release Switch
Tachometer Wire Negative Wire (-): Black
Tachometer Wire Negative Wire Location: Diagnostic Connector Under Hood
Brake Light Positive Wire (+): Brown/Gray
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): Disarms With Unlock, Single Pulse On Unlock Wire, Disarms
Factory Alarm Disarm Wire Location: N/A
Anti Theft Type: This vehicle uses a special parking light circuit that will require an extra relay.