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Cruise Control Installation - Porsche 911 Carrera
 
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Pelican Technical Article:

Cruise Control Installation - Porsche 911 Carrera

Time:

6 hours6 hrs

Tab:

$300

Talent:

****

Tools:

Torx driver set

Applicable Models:

Porsche 996 Carrera (1999-05)
Porsche 996 Carrera 4 (1999-04)
Porsche 996 Carrera 4S (2002-05)
Porsche 997 Carrera (2005-08)
Porsche 997 Carrera 4 (2006-08)
Porsche 997 Carrera 4S (2006-08)
Porsche 997 Carrera S (2005-08)

Parts Required:

Cruise control switch, connectors, and wire

Hot Tip:

Easy to install with the on-board computer

Performance Gain:

No more sleepy feet

Complementary Modification:

On-board computer installation

In 2000, the Carrera 2's engine management system was upgraded with a new system that used an electronic throttle body (E-gas). The Carrera 4 had seen this introduced the previous year (1999). This eliminated throttle cables, and instead the gas pedal has a sensor on it that controls an electronic stepper motor located on the throttle body in the engine compartment. Because this entire arrangement is completely electronic, the car no longer needed to have a separate, complicated cruise control system. As a result, if you have a 2000 and later Carrera (or 1999 C4) that didn't come with cruise control installed from the factory, then you can install the turn signal switch with the cruise control stalk, run some wires, and turn it on electronically in the computer.

This project is very similar in principle to the on board computer installation (Pelican Technical Article: On Board Computer Turn Signal Installation for the Porsche 911 Carrera). Similar to that one, you need to remove the gauge cluster, the steering wheel, and the turn signal switch in order to upgrade your car. Please refer to Project 91 for specific instructions on how to replace the turn signal switch. This project will focus mostly on the additional steps that are required to wire up and activate the cruise control feature.

There are a few parts that you will need. Firstly, you will need a Four Lever Stalk unit (996-613-219-10-EWC-M100). You will also need a connector that plugs into the stalk (PN: 999-652-972-40), a VW wire connector (000-979-010, see Pelican Technical Article: On Board Computer Turn Signal Installation for the Porsche 911 Carrera) and 8 female pins in order to install inside the two connectors (PN: 999-652-901-22, get some extras). You will also need enough 22-gauge wire to run four separate wires from the dashboard of the car to the Motronic computer located behind the rear seats. I suggest using four different-colored wires for this task.

Crimp the pins on to the five wires (four from the Motronic unit in the rear and one from the cruise control connector to the fuse panel) and run them through the car according to the following table and also using the guidance provided in the accompanying photos. Use the pins from the VW wire 000-979-010 to plug into the back of your instrument cluster (see Pelican Technical Article: On Board Computer Turn Signal Installation for the Porsche 911 Carrera). Also make sure that you have a good working bulb (for non-LED lit clusters) in the cruise control indicator socket of the gauge cluster.

Cruise Control Connector Carrera 2000-2002 (C4 1999-2002)

Cruise Control Connector Pin #1

Motronic Connector IV - pin #27 (black)

Cruise Control Connector Pin #2

Fuse B7 (black)

Cruise Control Connector Pin #3

Motronic Connector IV - pin #25 (yellow)

Cruise Control Connector Pin #4

Motronic Connector IV - pin #19 (brown/yellow)

2000-02 Gauge Cluster with a Blue Connector I - Pin #16 or if you have a Black Connector III: Pin #17

Motronic Connector IV - pin #18

For 2003-2005 996 cars it's much easier. The cruise control functions are integrated into the instrument cluster, and all you need to do is wire the cruise control stalk switch to the appropriate pins in the instrument cluster. This is nearly identical to how the on-board computer is wired up (see Pelican Technical Article: On Board Computer Turn Signal Installation for the Porsche 911 Carrera). Connect the cruise control connector to the gauge cluster using the following table:

Cruise Control Connector: 996 Carrera 2003-2005

Cruise Control Connector Pin #1

Plug C on the Gauge Cluster (Grey) - pin #17

Cruise Control Connector Pin #2

Fuse B7 (black)

Cruise Control Connector Pin #3

Plug C on the Gauge Cluster (Grey) - pin #4

Cruise Control Connector Pin #4

Plug C on the Gauge Cluster (Grey) - pin #1

For all 996 Carreras, 2000-2005 (and 1999 C4) cars, once you have all of the wiring done, you will need to have the dealer activate the cruise control function using the PST-2 or PIWIS programming unit. The section for programming this in the tool is located in the DME module, under the Coding section. You also need to activate the instrument cluster for cruise control as well. This is found in the "Instrument Cluster" coding section within the Porsche programming tool. Make sure your car has the "order code" properly set; otherwise you may have trouble properly programming the instrument cluster.

Carrera C2s in 1999 didn't have an electronically controlled throttle--instead they have a special servo motor that's attached to the gas pedal and controlled by a separate cruise control module. It is possible to retrofit these components to a car that did not have cruise control from the factory, but it's quite a bit more complicated. You need to purchase the cruise control pedal assembly and the control module/servo motor (see Figure 4) and then wire the assembly to the car.

For the 997 Carreras from 2005-2008, the installation is much easier. You need to purchase a cruise control switch (PN: 997-613-261-00), a small wiring harness (PN: 997-622-674-00), a new lower steering column cover (PN: 997-552-475-03), and two Torx screws to secure the new switch (PN: N-909-068-01). There is a factory retro-fit kit available that includes all of these parts and instructions (PN: 997-044-903-00), but you can save money by simply buying the parts separately. Simply remove the bottom cover, install the new switch and harness, plug the harness into the connector on the switch above it, and then install the new lower cover. The cruise control function then needs to be turned on by a Porsche dealer or independent shop with a PIWIS programming tool. The whole process should take about 30 minutes--very simple.

Cruise Control Troubleshooting: If your new cruise control installation doesn't work, then check your wiring. Also double-check to make sure that the technician who programmed your Carreras computer properly set the cruise control function in both the DME and in the Instrument Cluster section. If you are still having difficulty or if you have cruise control installed from the factory and it's not working properly, you might want to try the following troubleshooting steps:

Check the stalk switches. Unplug the connector and use a multimeter to test the proper functioning of the switches.

Check the brake pedal and clutch switches (see Pelican Technical Article: Brake Clutch and Cruise Control Switch Replacement - Porsche 911 Carrera). Both of these deactivate the cruise control, and if the switches are faulty, they will prevent the computer from activating the system. Not only can they fail, but they can also slip out of their bracket which causes them to not work either.

Check to make sure the bulb in the cluster is not burned out, and that it turns on for a second or so when you turn the ignition on.

Check the B7 slot in the fusebox to make sure the fuse powering the system is not blown.

The wire from pin No.
Figure 1

The wire from pin No. 2 of the cruise control connector needs to be wired to the black wire running to fuse B7 at the rear of the fuse panel. Remove the passenger side footwell covers and you should be able to see the fuse panel. Remove the panel (be sure to disconnect the battery first) by removing the four Phillips-head screws and then squeeze the tabs on the side to remove it (yellow arrow). Attach the wire to the black fuse B7 as shown using a tap-in connector (green arrow). This will provide the cruise control circuit with the brake pedal signal to turn off the cruise control function.

On cars up to and including 2002, in order to get the control signals from the Motronic DME in the rear to the gauge cluster and the cruise control stalk, you need to run four wires down the left side of the car and into the rear area.
Figure 2

On cars up to and including 2002, in order to get the control signals from the Motronic DME in the rear to the gauge cluster and the cruise control stalk, you need to run four wires down the left side of the car and into the rear area. In the coupe the DME is behind the rear seats under the shelf. In the convertible the DME is located behind the roll bar bulk head, under the carpeted body flap. Begin by taping the four wires together to make them easier to fish through the chassis. A: Run the new wires attached to the cruise control connector alongside the left side harness down to the fuse panel (green arrow). B: Pop off the three plastic rivets that hold on the covers for the hood and trunk release mechanism (blue arrows). Loosen the bolts that hold on the mechanism, but do not remove them. Having the right tool really works here, a fold-up Torx set works perfectly in this tight space (some cars may use a hex head screw instead). C: Pull up on the plastic trim and the assembly unit will snap up and out of the way. Do not disconnect the cables. Run the new wires next to the existing wire harness underneath (green arrows). D: Remove the side panel in the rear seat area that covers the seat belt and sun roof mechanism. ( Project 102C Carpet removal) E: Now remove the rear seat on the left side along with the rear panel (again see project 102C Carpet removal). F: Lift the rear carpet up and run the wires alongside the existing wire harness. The wires never need the leave the "dry "area of the car, so you can just safely route them back to the DME. It is a good idea to zip tie them to the existing wiring harness. Do not route them anywhere near moving or sharp areas of the car.

Shown here is the location of the Motronic DME in the rear bulkhead of a 996 Cabriolet (green arrow) .
Figure 3

Shown here is the location of the Motronic DME in the rear bulkhead of a 996 Cabriolet (green arrow) . Remove the connector from the back of the unit and then add the pins into the empty slots according to the table in the text of this project. (Connector IV is not visible, it is located behind the box.)

Shown here is the cruise control servo module and gas pedal for the 1999 Carrera (2wheel drive version) with the cable driven accelerator.
Figure 4

Shown here is the cruise control servo module and gas pedal for the 1999 Carrera (2wheel drive version) with the cable driven accelerator. The E-gas cars do not have the accelerator cable and the 2005 (997) and newer pedals have the servos built into the pedal unit.

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Comments and Suggestions:
carlinhos lima Comments: Good afternoon.
I have a 997 turbo 2007, and the sport button is not working, coding has already been done on the instrument panel but there was no success, please anyone has any information on how to make these buttons work again?
November 8, 2016
  Followup from the Pelican Staff: When did it stop working? After a repair?- Nick at Pelican Parts  
Coltti Comments: Im working on a 2002 Carrera 4, imported from Japan. Apparently i have same problem as fredde1972 had. Gauge cluster connectors from left to right are: Grey, Blue, Green.

Does this mean that for this car i should use the instructions for the 2003-2005 996?
The VIN number is: WP0ZZZ99Z2S603593.

Can you also reply to my e-mail please?
August 23, 2016
  Followup from the Pelican Staff: I believe so, the later one applies. To be sure, Give our parts specialists a call at 1-310-626-8765
- Nick at Pelican Parts
 
Martin Comments: Okay, 3rd time lucky - plug IV is the 40 pin one counting 1,2,3,4 from the other end of the unit - hurray!
August 22, 2016
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
Martin Comments: Looking at the Motronic plug IV it has pins 18 & 19 but pins 25 & 27 are on the plug III next door - Is this correct for my 2001 C4 Tip cruise connections too? Thanks.
August 22, 2016
  Followup from the Pelican Staff: I don;t have a wiring diagram for your vehicle to compare it to. The Bentley manual should have it.- Nick at Pelican Parts  
Martin Comments: I have everything I need to retrofit cruise to me 2001 C4 including a professionally made harness to run from the 4-lever switch to the DME but am unable to work out how to open up the long plug that locks down onto the DME in order to access the pins and fit the new wires. I have it unplugged and opened up the tie wrap and slid out the short cover but it still does not give me access to the large 'pin block'. Help please!
August 20, 2016
  Followup from the Pelican Staff: Can you share a few photos of the connector? It may come apart a few different ways, the center levered out, the rear removed, then the wires pulled out, etc. - Nick at Pelican Parts  
kalas Comments: Just completed cruise install on 2003 996 Targa Tip.
A couple of gotchas...
On the instrument panel removal, after removing the hazard switch, the surround was particularly difficult to pop out. Using a flat blade in the opposite slot where the switch was worked. It was held in Very well.
When trying to remove the instruments unit, I found that after removing the 2 screws, I hit gently the upper front edge of the cluster in an upwards and forward motion. There was a good crack and I thought I must have broke something, but it was the sounds of the big clips releasing. It then lifted up and tipped towards me so I could remove the Grey Left Hand Plug.
February 15, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
fredde1972 Comments: Hi, I have a Carrera C4S made in January 2002. I have bought wire harness the long version that goes back to DME under subwoofer and stalk. I am a little uncertain when it comes to the cluster wire hookup. I unscrewed the instrument cluster today and my plugs are from left to right seen from the steering wheel GREY, BLUE, GREEN. So no BLUE connector 1 or BLACK connector 3. When I saw this I was very suprised. I was certain this change to GREY plug 1 was from 2003 and not possible to see on car from January 2002. Does this mean I have bought the wrong harness?
November 6, 2015
  Followup from the Pelican Staff: Quite possible. The wire colors shouldn't change. To be sure, give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
ziaaiz Comments: i have carrera4 2000. what have i do with dme? any programing?
September 25, 2015
  Followup from the Pelican Staff: What are you trying to do? Replace the DME, then yes. It will require programming. - Nick at Pelican Parts  
leneuromancer Comments: Any recommendations on how to remove the 'lower steering column cover on a 997 06 C2S ..I got all the screws but cannot figure out how to remove this piece, almost got it, but now just scratching up the trim
August 14, 2015
  Followup from the Pelican Staff: The upper fasteners are removed? If they are, fold the top cover up and remove. Unclip the wiring, then remove the lower trim panel fastener and remove the panel. - Nick at Pelican Parts  
911dreamer Comments: Correcting myself: the problem described first by Ian occurs only when trying to fit the wires to wrong connector. The connector IV is not visible in the Figure 3 but it is behind the box, as stated in text.
July 23, 2015
  Followup from the Pelican Staff: Ok, thanks for the info. I will try to have the article updated to note this. - Nick at Pelican Parts  
911dreamer Comments: I have exactly the same problems as Ian with my -01 Carrera 4. I am asking you to put some information to your website about this problem because it is quite frustrating to order all the parts and then find out that your instructions do not apply to all 996 models...
July 23, 2015
  Followup from the Pelican Staff: Can you share a photo of the connector you are trying to work with? - Nick at Pelican Parts  
Londoneldy Comments: Hi, you say above "For the 997 Carreras from 2005–2008, the installation is much easier." How about the Gen 2 997. Will the same kit work? I have a 2012 GTS
June 7, 2014
  Followup from the Pelican Staff: Not sure if the kit will work on your vehicle. Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
Ian Comments: Thanks...resolved now
February 19, 2014
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it. What was the fix? - Nick at Pelican Parts  
Ian Comments: Hi, I have purchased from Pelican Parts the parts for the cruise control instal for my 1999 996 C4, but find that the female pins 999-652-901-22 do not fit the motronic plugs #s 27, 25, 19, 18 as per your Technical Article.
Also, I find that pin slots on the motronic plug has wires in pin slot #25 purple/white and pin slot #18 black/white.
Please help!
February 13, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help sort out the issues with the parts. - Nick at Pelican Parts  
ausie paul Comments: Hi is the unit in fig 4 the same one as in the 99 boxster 2.5
December 11, 2013
  Followup from the Pelican Staff: The part does not apply to your vehicle. - Nick at Pelican Parts  

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