My ‘95 VDP was having difficulty starting. It worked, then it didn’t. I replaced the battery, and all was well for a month. Then totally wouldn’t start. Towed it to a friends shop, replaced the starter (and relay). Both tested bad. Still no start. Bypassed neutral safety switch and it would start occasionally. Very hard to find a new switch. Found a used one, but ridiculously priced, and USED! So we tried to install a micro switch, in the shifter, to create a neutral safety switch. Somehow, it still doesn’t recognize the switch. Any suggestions? Any other neutral safety switch from another brand or vehicle work? Please help. Car has been idle now for almost 2 months 😩

 

With a new switch some have installed a normal open switch with a normal closed switch and can easily be done in the part ordering prosses

The way the wiring schematic is drawn with the switch relaxed it would be normally open or a NO switch and not NC

This can be seen on page 72 pin FC2 - 16 at the Body Prossesor Module of the wiring "" break out sheet ""

http://jagrepair.com/images/AutoRepa.../jagxj1996.pdf

The NO or NC is usually marked on the micro switch

The switch also has a dimension of the depression of the red button to make the switch change from open or close

And this dimension can be ordered by size

This dimension is different as you order them and may not be available information in shopping

This is a pic from contributor Oliver Marks

 

It sounds like you are referring to the micro switch that @Parker 7 has shown in the pictures above.

If so, that is the "Not in Park" switch. It plays no part in the starting sequence for the engine. It is used only for the Gearshift Interlock.

The Park/Neutral sensor for "start enable" comes from the Linear Switch/Decoder module, which is the big black box at the bottom of the photo above. This may be out of alignment and can sometimes be re-aligned after loosening. Search the forum for Gearbox Linear Switch.

Additionally, there is a connection through the transmission Rotary Switch (that must be in Park/Neutral) that is required to enable the starter relay.

 

I always had a question on that taking that the Not In Park switch does feed the BPM it could still be used in the starter enable although they are seperate dedicated wiring guide sheets

We would sometimes have to put 4 sheets together

I think my fuzzyness is in reference to the red P light being a requirement for starter enable being it is a general operating expectation in the practice of starting any car

Both the linier switch in the pic as the black rectangle to the right of the shift post and the rotary switch under the floor pan can be opened up and cleaned with solvent and a pencil eraser rubbing of the electrical contact surfaces inside

 

Hi Parker

Strictly speaking the red P is not a requirement. The requirement is for Red P or N. That's why the linear switch needs to provide that signal for the gear indicator and for the start enable.

The "Not in Park" switch only knows whether the car is in Park or not. It doesn't know if car is in Neutral or anywhere else.

There are lots of threads about failed Not in Park switch. The most common symptom is constant clicking from the Gearshift Interlock solenoid every time the brake pedal is pressed. The solenoid should only operate when the car is in Park - and it is the Not in Park switch that provides that signal.

The signal is provided to the BPM and the BPM outputs signals to Gearshift Interlock solenoid and Ignition Key solenoid (to prevent key being removed while car is not in Park).

 

Thanks Brenden ,

Let me digest the info you provided as I am tasking a couple of things at once

 

A quick check I found this

This only relates to the not in park switch but does have a link in post # 15 for the switch

Skislope / Gearbox Park switch - Jaguar Forums - Jaguar Enthusiasts Forum

and this

Y4T6Y-1884 Sundry - 19 in stock to buy, photo, pdf datasheet, rfq, obsolete (buy-transistors.com)


Part # in the post Y4T6Y/1884

Still multitasking

The picture is a altered pic with pasted in part # but may give a needed outline visual clue