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Repairing Parking Sensor & Reverse Lights MPLS Switch 252927 (AL4 Auto Transmission)
28-12-2016, 08:51 AM, (This post was last modified: 28-12-2016, 14:46 PM by Simple.)
Post: #1
Repairing Parking Sensor & Reverse Lights MPLS Switch 252927 (AL4 Auto Transmission)
The Parking Sensors on my Citroen C8 with an AL4 Automatic gearbox suddenly stopped working. Lexia reported that they are deactivated, I also found that the Reverse Lights were not working either.

This is a brief "How To" in case someone faces the same issue:

Having checked all connections and fuses, the only suspect component was the Multi-Function Switch (MPLS #252927), positioned on top of the AL4 gearbox, below the air filter. The dealer quoted 120 Euros for the part; I decided to have a go at it.

To remove the MPLS (having removed the air filter), remove the gear shift linkage to the gears selector, the 2 Torx screws and connector from the harness on top of the gearbox. Unscrew the little Torx screws to access the Multi-Function Switch (MLPS) and remove the cover. Inside the MLPS there is a 2 legged “Bitron S10HD Micro-Switch” with a specially shaped plunger. This unit connects power to the revers lights and Parking Sensors when the gear is in reverse position.

The Micro-Switch can be tested using a “continuity tester” to the two legs and pushing the plunger few times. Mine was pitted and gave a noisy signal indicating weak connection. There is a reach adjuster in case the lever is not pushing deep enough. Pull the Micro-switch out and carefully split the cover open (using a sharp knife) and examine the contact points for pitting or damage (do not clean using sand paper, this damages the coating).

The “Bitron S10HD Micro-Switch” was difficult to locate on the internet, but managed to obtain its specification sheet. Basically, what is needed is a 10 Amp, 125 Degrees Celsius and 0.6-1.0 newton (plunger activation force, about 60-100 grams). An equivalent would be the Honeywell V15T16-CP100 or V15H16-CP100 (could not locate at the time). But I found an SPDT (3 legs with lever) Honeywell Micro-Switch “V15T16-CZ100A05-K” with similar spec (around 3 Euros from Farnell/free delivery). I used the plunger from the Bitron, but needed to slightly file the cover to allow the plunger slide easily.

De-solder the Red and Orange wires from the faulty part and solder them in the respective legs of the new part, replace into position and test; if all is well, reassemble everything back ensuring correct MPLS "Neutral" positioning.

It has been running reliably for that past 5 months.


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