I was installing a headlight switch last night and all went very well.

But.....as I was looking under the dash i noticed a knob that i have never seen before. It is only accessible when the the lower bolster is loosened as i did to remove the headlight switch. The previous owner of the car did some weird things so i am not sure if this is an original feature. (he removed the kick down switch,????Why would anyone do that?)

Any help in figuring this out would be appreciated. I didn't touch it, but i might to see if it does anything

Thanks

Attached Thumbnails

 

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63 190d (sold)
69 220D (sold)
69 280SL (sold)
76 BMW 2002 (sold)
86 190E-16v (Demised at Laguna Seca Turn 9)
87 300SDL (sold)
87 300SDL 135k
87 300TD 280k (sold)
95 E320W 211k
95 E320w 111k
05 C320 4matic
06 E320 CDI 90k (Totaled by a texting 19 year old girl in a nissan)
2013 GLK 250 Bluetek 4MATIC

That appears to be a cruise control amplifier. The knob is a lock/unlock.

Sent from my XT1710-02 using Tapatalk

Diagnostic module. The knob is to engage / release it from the connector.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

I am interested on the purpose for an inaccessible switch. When is it used? Why isn't it readily accessible?

It isn't a switch. It's a latch. Turning it one way releases the module and pushes it out of its socket, turning it the other way pulls it into the socket and latches it in place.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

FWIW, the DM's only function is to monitor smog-related stuff and turn on the CEL if there's a problem.....

Too funny, a couple nights ago I also replaced the headlight switch in my new-to-me '94 E320 TE, and saw and wondered about the same switch.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC