Last week I helped a gentleman with instructions for switch disassembly/assembly, circuit board analysis and rebuild. I will attach the link to that below. I promised to post a pin out for everyone's reference.

The switch uses a 20 pin connector. This description uses the following orientation:
Unplug the connector. Hold the connector female pins facing the ceiling, wire harness comes out the back rewards the floor. Rectangular Tab is in 12 o'clock position top center.

PINS:
___________________<TAB>______________
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |

COLORS
_____________Tab________________
WG|OB| X | B |RW|BR|PB|X|X|NW|
OR |YO| SN |YN| X |BO|BG|X|X|BK |

Color definition:
N Brown O Orange B Black
S Slate W White L Light
K Pink U Blue G Green
P Purple R Red BRD Braid
Y Yellow

Pin# Color Description
1. WG. Fold Back
2. OB. Direction (12volts present when pin10, 12volts is directing movement)
3. Not used
4. B. LED
5. RW. LED
6. BR. RH(right hand) Window Up
7. BP. RH Window Down
8. Not used
9. Not used
10. NW. Positive +12volts Power supply

11. OR. LH mirror Vertical (+12volts tilt Up [see pin2]; Ground tilt Down)
12. YO. LH mirror Horizontal (12volts tilt Left [see pin2]; Ground tilt Right)
13. SN. RH mirror Vertical (+12volts tilt Down [see pin2]; Ground tilt Up)
14. YN. RH mirror Horizontal (+12volts tilt Left [see pin2]; Ground tilt Right)
15. Not Used
16. BO. LH Window Up
17. BG. LH Window Down
18. Not Used
19. Not Used
20. BK. Ground (power supply)

Note: 12volts positive mirror movements simultaneously apply 12volts to pin 2

Link to details on switch & circuit board assembly / repairs:

https://www.jaguarforums.com/forum/x...roblem-254476/


John

 

So, this little PCB has all the embedded logic for the windows and mirrors? Like when you have to recalibrate the window stop points after a hard reset - that's done and recorded on this PCB?

Also the mirrors will tilt down by 7 degrees if you are in reverse and going slowly is that also done on this PCB or does it have to interrogate CANBUS to know the speed for example?

I'm trying to understand where CANBUS is used in case it isn't obvious

 

Hehe - nothing so simple - this is a Jaguar!
Most of the electrickery is done by the door control modules, but the seat modules are also involved if you have the foldback option.

Comms is over SCP rather than CAN.

 

So, this PCB is monitored read/write by at least one control module and if it's two then presumably they use CAN BUS to exchange the status of the switches etc.

 

Driver side switchpacks (including window lifts not shown here) connect to door module, which talks over the SCP bus to the others:

 

Michael, perfect answer as always!

John

 

Thank you, now I sit and think. Always a slow process involving some pain. But ideally not gin.

 

I have to admit to some head-scratching when I first looked at this. What on earth does a seat module have to do with moving mirrors around

Perhaps there was some spare functionality in the module that was pinched to do the job. Or perhaps it was something else entirely.


Merry Christmas to you all.

 

My guess is that the door module ran out of pins while the seat module had some spare.

In my rather limited experience you run out of pins very quickly when monitoring hardware and have to adopt different strategies which is what I thought in part CANBUS was but I think I'm wrong and CANBUS lets you have multiple control units that can communicate.

 

If you don't have memory seats you might not know this, but the memory buttons moves the seats and the mirrors to the saved position, so the seats and the mirrors do need to be connected.

Cutting edge mega expensive tech 25 years ago, which could be replaced by a $10 Arduino today.

Merry Christmas!

 

But when you say 'connected' I assume that they are not connected physically but via CANBUS?

And I mess about with Arduino and it's quite surprising what you can do.

 

I haven't looked at the wiring diagram, but Michaelh says they are connected by the SCP bus - so the wires may or may not go directly between modules. The wiring diagram has all this information and its well worth spending some time studying it.

 

I suppose there's no escaping it

 

Yep, that would make total sense. I don't have the memory stuff on mine, but excuses, excuses. Another 'doh! why didn't I think of that' moment for me
Thanks.

@drmike - the Electrical Guide is a mine of information. It's worth also taking a look at the message matrix appendices. They're useful to see what is talking to what, about what, and give an indication of the amount of inter-module dialogue there is.
Definitely SCP bus:- the door, seat and security modules don't hang off the CAN.

From member Gus' website of everything:
http://www.jagrepair.com/images/Auto.../jagxk2000.pdf