Rebuild D2 ZF Selector Switch UHB100190

Just a note for the record, in case anybody has a similar problem. My D2 was doing this intermittent flashing M + S lights, which would usually go away with a switch-off/switch-on of the ignition. Talking to the previous owner, this issue had been years in existence. Last week it finally went to limp-home permanently. We had checked all of the usual suspects as described above, including changing the inhibitor switch (XYZ) with a known-to-work used replacement. No dice. Yesterday had the tranny ICU replaced (under the passenger seat), and all good. So it was the ICU itself.

Quote:

---

Originally Posted by Michael2

D2 Auto Selector Switch. p/n UHB100190



Drill out the rivets



Cover Off



A cover showing water ingress damage



Lift the tabs over the wire crimps



Tab off - wire crimps revealed



Continue to remove the tabs







All the tabs off



I marked the position of the wheel - this is not necassary



Remove the wheel - notice O-Ring seal either side of it.



The wheel



The cams on the wheel that actuate the switch.



Clean with a contact cleaner that doesn't leave a residue



Prise out the whole assembly - do not remove the tan coloured tabs, and the micro-switches don't have prise open tops.



The silver contacts are moved by the cam on the wheel to actuate the micro-switches. These cams have a mechanical function (not electrical). They will wobble a bit, but test that when pushed firmly in, they have some spring resistance as the open the electrical contact.



The electrical contacts are on the outside of the assembly. Clean these well, they're like indicator stalk switches in the nature of their construction.



Here you can see the wiring and both switches.



Remove the rubber seal and apply silicone to both faces, then reuse the seal and bolt it together using nylock nuts.

---

I can't see the photos?
Is there something I'm supposed to do to see them???

Quote:

---

Originally Posted by Ypahihi

I can't see the photos?
Is there something I'm supposed to do to see them???

---

Nup, no pics.
Possibly an outside image hoster was used.

Attachment 159775
D2 Auto Selector Switch. p/n UHB100190
Attachment 159776
Drill out the rivets

Attachment 159777
Cover Off

Attachment 159778
A cover showing water ingress damage

Attachment 159779
Lift the tabs over the wire crimps

Attachment 159780
Tab off - wire crimps revealed

Attachment 159781
Continue to remove the tabs

Attachment 159782
All the tabs off

Attachment 159783
I marked the position of the wheel - this is not necassary

Attachment 159785
Remove the wheel - notice O-Ring seal either side of it.

Attachment 159786
The wheel

Attachment 159787
The cams on the wheel that actuate the switch.

Attachment 159788
Clean with a contact cleaner that doesn't leave a residue
***This cleaner was corrosive and the contacts failed after some days - use non corrosive***

Attachment 159789
Prise out the whole assembly - do not remove the tan coloured tabs, and the micro-switches don't have prise open tops.

Attachment 159790
The silver contacts are moved by the cam on the wheel to actuate the micro-switches. These cams have a mechanical function (not electrical). They will wobble a bit, but test that when pushed firmly in, they have some spring resistance as the open the electrical contact.

Attachment 159792
Here you can see the wiring and both switches.

The electrical contacts are on the outside of the assembly. Clean these well, they're like indicator stalk switches in the nature of their construction.

Attachment 159791
The electrical contacts are on the outside of the assembly. Clean these well, they're like indicator stalk switches in the nature of their construction.

Attachment 159793

Remove the rubber seal and apply silicone to both faces, then reuse the seal and bolt it together using nylock nuts.

[bigrolf][bigrolf][bigrolf][bigrolf]

Thanks Michael !!