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I am getting a General Electronics Control code B2496 on my 06 SV8 which the i930 says is Anti-Theft Horn ground fault (or was it short to ground?)
Is there an anti-theft horn separate from the normal road horn pair? When I lock it with the fob the side lights flash but there is no beep. I thought it was because my road horns didn't work, but after fixing them it still doesn't beep when remote locking. Should it beep?
As far as I know, the chirp you can get from locking the car is separate from your steering wheel horn, and can be enabled/disabled via the JLR diagnostic software.
You should hear this horn beep when you press your key fob while the car is on or when you leave a door open, boot etc.
It's also a cool way to say hi to a fellow jag owner on the road.
It seems like I saw a picture of where it was in the car not too long ago, but can't find it now.
Thanks for the link. One fellow said it might be behind the right side boot panel but another said, "I had mine replaced... The rear seat and package deck had to come out to get to it. Part was cheap. Labor cost plenty."
Don't know if I am that concerned about the code and lack of chirp if it is that much trouble, but maybe some day. Would be nice if some one has photos to verify the location before tearing into the package shelf.
One fellow said it might be behind the right side boot panel but another said, "I had mine replaced... The rear seat and package deck had to come out to get to it. Part was cheap. Labor cost plenty."
It occurs to me that the fellow who said the rear seat and package deck had to come out must have been talking about the rear parking aid beeper and not the "security horn" behind the right rear wing liner.
I am getting a General Electronics Control code B2496 on my 06 SV8 which the i930 says is Anti-Theft Horn ground fault (or was it short to ground?)
Hi Phil,
The i930 may give an abbreviated explanation of the fault codes. According to the DTC Summaries Manual here is the explanation of B2496:
The Front Electronic Module reports the fault, and it appears the code is triggered by a fault in the relay drive circuit, not the circuit for the horn itself.
But looking at the schematic for the security system, it appears that both the Passive Security Sounder and the Active Security Sounder connect directly to the Rear Electronic Module with no separate relay in their circuits, so the relays may be inside the REM.
But the fault is reported by the FEM. The only connection I see between the FEM and the sounders, or horns, is a "Security Ground Sensing" network connection on a Blue wire with Yellow tracer line (UY) that connects the FEM (output) to the REM (input). I would think that a short in a network wire would trigger a U code rather than a B code, but it would be easy enough to check for a short to ground in the UY wire that connects to pin CR4-19 at the REM and pin CR1-25 at the FEM.
The wire connects through connector DD1, a 22-way black connector at the driver's side A-pillar. If you find a short to ground in the UY wire, it would be worth checking for corrosion in that connector that might be bridging two pins.
BTW, the Electrical Guide indicates that both the Passive and Active Security Sounders are mounted in the "Trunk / RH Side / Forward." You can download the full DTC Summaries Manual and the Electrical Guide at these links:
The i930 may give an abbreviated explanation of the fault codes. According to the DTC Summaries Manual here is the explanation of B2496:
The Front Electronic Module reports the fault, and it appears the code is triggered by a fault in the relay drive circuit, not the circuit for the horn itself.
But looking at the schematic for the security system, it appears that both the Passive Security Sounder and the Active Security Sounder connect directly to the Rear Electronic Module with no separate relay in their circuits, so the relays may be inside the REM.
But the fault is reported by the FEM. The only connection I see between the FEM and the sounders, or horns, is a "Security Ground Sensing" network connection on a Blue wire with Yellow tracer line (UY) that connects the FEM (output) to the REM (input). I would think that a short in a network wire would trigger a U code rather than a B code, but it would be easy enough to check for a short to ground in the UY wire that connects to pin CR4-19 at the REM and pin CR1-25 at the FEM.
The wire connects through connector DD1, a 22-way black connector at the driver's side A-pillar. If you find a short to ground in the UY wire, it would be worth checking for corrosion in that connector that might be bridging two pins.
BTW, the Electrical Guide indicates that both the Passive and Active Security Sounders are mounted in the "Trunk / RH Side / Forward." You can download the full DTC Summaries Manual and the Electrical Guide at these links:
Don, I realize this is a fairly old post, but where exactly is the FEM and how do I access it and this connector (DD1) in the A pillar, please?
Hi Ray,
In the front pages of the Electrical Guide are diagrams showing the locations of modules, connectors and grounds. For example, here's a snip from the diagram that shows the location of the FEM:
In the front pages of the Electrical Guide are diagrams showing the locations of modules, connectors and grounds. For example, here's a snip from the diagram that shows the location of the FEM:
Cheers, Don
Thanks Don, but with such a detailed and descriptive location as Jaguar provide there, I would not even know where to start! Think I will just live with B2496!!
Thanks Don, but with such a detailed and descriptive location as Jaguar provide there, I would not even know where to start! Think I will just live with B2496!!
Left side of driver's footwell behind kick panel.
If you find a schematic in the Electrical Guide with the Front Electronic Module (e.g. Central Locking), on the page before that schematic all of the components, connectors and grounds are listed with at least a cryptic description of the location, such as "Cabin, LH A-Post."
Hey guys, am I missing something here? First of all, I suspect a battery drain, second, most forum folks say the anti theft system is usually the main culprit. Third, the error code, B2496 says 'short to ground'. OK then in layman's terms, does that mean there is a exposed wire someplace shorting, and if so, where should I look first for this shorted wire. It's pretty cold outside and I'm trying to keep this as short a job as possible!
Hey guys, am I missing something here? First of all, I suspect a battery drain, second, most forum folks say the anti theft system is usually the main culprit. Third, the error code, B2496 says 'short to ground'. OK then in layman's terms, does that mean there is a exposed wire someplace shorting, and if so, where should I look first for this shorted wire. It's pretty cold outside and I'm trying to keep this as short a job as possible!
I think I posted this earlier in the thread, but just to keep the documentation together, here are the definition and possible causes given in the DTC Summaries, which clearly shows that B2496 is a code triggered in the Front Electronic Module (FEM):
Here is the diagnostic entry from the Electrical section of the Workshop Manual:
Here is the schematic for the horns:
Just for reference, it would appear that B2496 has nothing to do with the Passive Security Sounder or Active Security Sounder, which are mounted in the right forward side of the trunk and are driven by the Rear Electronic Module (REM):
Thinking about the circuit for the horns, the most likely place for a short to ground is right at the horns and their electrical connector. Do both of your horns work? You should hear two different notes when you sound the horns.
The horns are mounted in the front left bumper cover near the air suspension compressor. Check the connector and clean it if it's contaminated.
The horns on my '04 XJR filled up with mud and water and stopped working. I was able to flush them with denatured alcohol and dry them in a warm oven overnight and their function was restored for awhile, but they eventually failed again. I found that a pair of horns from a certain model Chevrolet had the same electrical connector and worked fine. I can't recall which model of Chevy but I found the horns on eBay and could see that the electrical connector was identical.
B2496? Anti-Theft Horn?
