Retro fitting MK 1 C5 cruise control
This guide is for the retro fitting of cruise control to a right hand drive MK 1 C5.
This will only work on diesel models or petrol models with a motorised throttle
butterfly. I will assume some basic knowledge of Lexia usage & interior trim
disassembly.
Tools required:-
A T-20 screwdriver
A T-30 screwdriver
A small sharp knife
A Lexia or Proxia diagnostic computer.
Parts required:-
Cruise control stalk Part number 6242Z9 (Dealer price £56.00 inc VAT)
Also earlier models before RP number 9611 Will require an additional brake switch
part number 453437 (Dealer price £16.40 inc VAT) & a switch retaining clip ring part
number 243805 (dealer price 65p inc VAT)
(Parts pictures shamelessly borrowed from eBay)
If sourcing the parts second hand all the MK 1 C5 stalks are the same regardless of
year or spec. The same stalk is also used on some Xsaras, Xsara Picassos & C8’s.
Some Peugeot models e.g. 206, 406 & 307 share the same stalk, make sure it is from a
model without the speed limiter function. The brake switch must be a red 2 pin one
like the one in the above picture.
Step one
First thing to do is remove the steering column lower cowling which is held in by 2 x
T-20 screws, on the left hand side of the COM 2000 unit (the indicator/wiper stalk
module) there is a blanking plate where the cruise stalk slots into, it is exactly
opposite where the radio remote buttons are. There is a plastic tab on the back of the
unit that when pushed in with a screwdriver allows it to be slid out. The cruise control
stalk slots straight in where the blank was removed.
The steering column cowling needs to be carefully cut with a sharp fine knife at the
markings shown in the picture, pretty much a mirror image of the cut out for the radio
control stalk. The cowling can be re fitted. I would however recommend testing the
operation of the cruise control works correctly before cutting & re fitting the cowling.
Step two
Identify if you need an additional brake switch or not, later models after RP number
9611 should have a dual function brake switch with 4 wires on it. If this is the case
you don’t need to do anything more with the brake switches.
On a RHD MK1 C5 the brake switche(s) are on the brake linkage located behind the
passenger’s side glove box. The picture (of an early type model) shows the location
of the switches with the glove box removed for clarity but they can be accessed just
by removing the soft trim under the glove box & looking up. The trim is held in place
by a plastic T-30 screw & a plastic twist clip.
If you just have the white brake switch with 2 wires you need to install the second red
brake switch in the empty hole to the right of it. The wiring for it with the red plug
should already be there but be aware that it may be hidden by insulation tape on the
loom that you may need to peel back a bit.
Fit the retaining clip ring into the empty hole first then push the switch into the ring,
note that the switches have ribs on them, this is to allow the switches to adjust in
different positions. Push the switch into the ring a click at a time until the black
plunger of the switch just touches the metal lever & plug in the connector. You may
need to adjust the switch’s position later.
The next picture shows the new switch fitted with the glove box in place & looking
up.
Step 3
You now need to program the injection ECU to acknowledge it has cruise control.
The Lexia menu’s might differ slightly depending which version you are using.
Carry out a global test with Lexia & then select the injection menu.
Once in the injection menu select programming > manual configuration > message
about referring to an info diag (just validate this) > screen showing engine code (it
may show the wrong engine code, just ignore it if it is & validate it > a warning about
changing the programming will erase fault codes > you will now see a screen showing
the ECU’s current configuration follow the prompt about changing the configuration.
Change RVV to present, once you have done this you need to press F1 to set the
programming, follow any on screen prompts. If Lexia asks you for a security code it
is 03114.
Next check the operation of the brake & clutch switches with Lexia. Again from the
injection menu go into Paramiter measurement > driving information.
Check that main brake signal & redundant brake signal change from pressed to
released when the brake is pressed, they should both change with about 5mm travel of
the brake pedal. If they don’t you will need to adjust the switch positions. If the car is
a manual version also check that the clutch pedal signal changes from released to
pressed when you operate the clutch.
Unplug the Lexia & switch the ignition off for at least 2 minutes to let the ECU power
down. Now you are ready to road test it. The operating instructions should be in the
handbook. But briefly the minimum speed it will work at is 25 mph & it will only
work in 4th gear or above. Once you get to your desired speed flick the switch to on &
push the up button, the cruise should take over, you can then adjust the speed up or
down a little bit at a time by pressing the up or down buttons on the stalk. It’s
important to check when you road test it that the cruise control cuts off when either
the clutch or brake pedals are pressed. If either pedals are pressed then need to re
activate the system again each time.
Enjoy your cruise control, Wheeler.
