Question about Toyota 4Runner

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2001 toyota 4 runner alarm goes off

I am a ham radio operator. Occasionally when I key my transmitter in my truck the when I am parked next to it the alarm in the 4 runner goes off. I probably need to add some chokes but without a wiring diagram I don't know where to put them. Any suggestions. Thanks

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  • steve65995
    steve65995 Oct 30, 2012

    As I said I am an Amateur Radio Operator and have a mobile transceiver in my truck. A 2009 Nissan SE. The Toyota 4 Runner is parked next to my pickup in the drive way. When I key my transmitter in the drive way next to the 4 Runner the alarm goes off. It appears as that RF from my transmitter is setting off the alarm. A fix could be as simple as putting ferrate beads on the leads going in the alarm unit. The ferrate beads would act as a choke and prevent from RF from getting into the alarm unit. My problem is I don't have a wiring diagram and don't know where the alarm unit is. Ferrate beads are frequently used on computer cables to prevent radio frequency interference (RFI).

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Ferrites may not solve the issues. You would want to follow the door switches over to the alawrm module, make sure that the module has a full metal casing, if not- wrap it in foil and ground it. Snap a 2 piece ferrite around each wire that comes out of the module and also add a .0.01 or 0.001 capacitor to ground from the higher potential wire connections at each switch you can locate to quench or bleed off the RF. You may need to relocate the antenna as well and also see if you can trim for even better SWR, and put a choke on the power feed wire to the transciever power leads 1 each side if the unit can be used in positive grounded as well as negative ground vehicles. And it might not hurt to put a ground plane (copper clad board) between the transciever and any wiring of the vehicle if possible. Many of those alarm units use a 10.7 Mhz IF, and recieve in the 380- 390 Mhz band, so you have some harmonics issues as well if it continues to be an issue. Switching to RG 8 may help.

Posted on Oct 30, 2012

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SOURCE: replace front brake pad 2003 toyota 4 runner

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Use scrap wooden wedges to pry between the rotor and the caliper ...inside and out until the calipers are fully withdrawn. Use the new pads to measure if they are far enough back.
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SOURCE: spark plug wiring on 2001 Toyota 4 Runner

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Posted on Feb 07, 2010

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Note : All transmitters being serviced must be available. If the learning process is carried out without having all the transmitters present, all previous transmitter codes will be overwritten, rendering the missing transmitters inoperable.

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Entering Programming Mode
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Mode 4: Lamps (Your parking lamps will flash every
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