2000 stype Neutral Safety Switch Diags
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From: Magalia
Don B Groung Strap
Hi Steve,
Was the engine ground strap reconnected just below the starter when the engine and transmission were replaced? It's on the right side of the engine and the other end of the cable connects to the bulkhead/firewall behind the right front wheel. This is the primary ground path that completes the starter electrical circuit.
Cheers,
Don
Was the engine ground strap reconnected just below the starter when the engine and transmission were replaced? It's on the right side of the engine and the other end of the cable connects to the bulkhead/firewall behind the right front wheel. This is the primary ground path that completes the starter electrical circuit.
Cheers,
Don
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From: Magalia
kr98664 start circuit
Ooh, good point. Stuff like that tends to get overlooked, and can cause all sorts of trouble.
Had a little more time to look at the wiring diagrams, available near the top of this page:
JagRepair.com - Jaguar Repair Information Resource
For your model year, take a look at figure 02.1 for the starter circuit. You can do a lot of troubleshooting under the hood at the starter relay (#15), with no need to crawl back under the car just yet.
Do the previously mentioned click test. If the relay clicks when the key is held to start, that tells us the relay is receiving the command to energize and send power to the starter solenoid. There would be no need to investigate the NSS, ignition switch, etc.
If no click, then definitely troubleshoot why. First step would be to swap in a known good relay from another position. If still no click, check if battery power is reaching socket 86 at the relay. If that is good, check if socket 85 has a good ground with the key to start. Note how that is a ground provided by the instrument cluster, which is also the heart of the security system. That's why I had previously asked about any PATS codes.
If you had a good click at the relay, that does not confirm power is actually being sent to the starter solenoid. It only confirms the relay is receiving the command. You'd then have to confirm battery power is available at socket 85. If that is good, try momentarily connecting a jumper between 85 and 87. That mimics the contacts closing in the relay when the electromagnet coil is energized, and will send power to the starter solenoid, which should engage.
Keep us posted.
Had a little more time to look at the wiring diagrams, available near the top of this page:
JagRepair.com - Jaguar Repair Information Resource
For your model year, take a look at figure 02.1 for the starter circuit. You can do a lot of troubleshooting under the hood at the starter relay (#15), with no need to crawl back under the car just yet.
Do the previously mentioned click test. If the relay clicks when the key is held to start, that tells us the relay is receiving the command to energize and send power to the starter solenoid. There would be no need to investigate the NSS, ignition switch, etc.
If no click, then definitely troubleshoot why. First step would be to swap in a known good relay from another position. If still no click, check if battery power is reaching socket 86 at the relay. If that is good, check if socket 85 has a good ground with the key to start. Note how that is a ground provided by the instrument cluster, which is also the heart of the security system. That's why I had previously asked about any PATS codes.
If you had a good click at the relay, that does not confirm power is actually being sent to the starter solenoid. It only confirms the relay is receiving the command. You'd then have to confirm battery power is available at socket 85. If that is good, try momentarily connecting a jumper between 85 and 87. That mimics the contacts closing in the relay when the electromagnet coil is energized, and will send power to the starter solenoid, which should engage.
Keep us posted.
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From: Magalia
PATS! It Was the Key
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Steve
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From: Oregon
One minor clarification, though, that could save you some trouble. Code 15 was not set by the “fob”. An item separate from the key itself, the fob is the remote doohickey with four buttons to lock and unlock the doors, open the trunk, and sound the alarm. Change the battery or do whatever you want to the “fob” and that won’t clear code 15. Hate to see you going down the wrong path with that.
Code 15 refers to the key itself, specifically the little magic transponder bean in the plastic head. Was this particular key working recently? If so, look to see if the magic bean fell out. If missing, you'd have a small hole open in the head of the key.
In this picture, the pen is pointing to the location of the magic bean:
If this particular key never worked, I’d set it aside and tag it to prevent using it again by mistake.
Last edited by kr98664; May 20, 2026 at 11:00 AM.
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From: california
thanks kr98664, I had 2 other keys and tried those and the engine turned over. The PATS indicator light had fallen inside the dash. Unfortunately the plastic is so brittle when i lifted the forward dash panel it broke so sometime down the road i'll be trying to replace that part. I pulled the PATS up and got error code 15. Which was key fob related. Got my other 2 keys and the engine turned over. I have the exhaust pipes off so will install later today or tomorrow. Thanks to all who are on the journey with me to get our baby running. Will keep you up to date on the progress.
Cheers
Steve
Cheers
Steve
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