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Charging and Jump Starting your Cayenne
 
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Pelican Technical Article:

Charging and Jump Starting your Cayenne

Jared Fenton

Time:

3 hours3 hrs

Tab:

$60 to $140

Tools:

Battery charger, multimeter, battery tender

Applicable Models:

Porsche 955 Cayenne (2004-10)
Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2003-10)
Porsche 955 Cayenne Turbo (2003-10)
Porsche 955 Cayenne Turbo S (2006-10)

Hot Tip:

Read the article and your owners manual thoroughly

Performance Gain:

Better operating electrical system

Complementary Modification:

Install battery tender

The electrical system on the Porsche Cayenne is rather complex and can cause a variety of problems when a battery has a low charge. On the Porsche Cayenne, a flat battery can cause a multitude of electrical glitches, Check Engine Lights (CELs) and slow starter operation. I've also noticed that a persistent PSM Failure message on the dash may also a symptom of a dying battery.

Keep in mind that Porsche recommends hooking up a vehicle power supply (and NOT a battery charger) to the car if you will be working on the vehicle for more than 15 minutes for procedures such as: using a diagnostic scanner, adjusting the headlights and any time the doors, hood and rear hatch will be open for an extended period of time. One way to reduce the amount of power consumed is to manually actuate the latches for the doors, hood and rear hatch. Simply take a screwdriver and push the latch to the closed position. This will trick the car's computer systems into thinking that the door is closed and it will shut off the lights.

Due to the design of the car, the best way to check battery condition is to use the factory Porsche diagnostic computer or a good aftermarket software package. Using a laptop, you can monitor the battery voltage as well as current draw and alternator output. Chances are that the vehicle likely has diagnostic trouble codes stored indicating a erratic voltage condition.

You can check the voltage on the jump start terminals in the engine compartment using a voltmeter. A normal battery should read a voltage slightly above 12 volts with the car sitting still, and no electrical devices on. A typical reading would be in the 12.6-volt range when the battery is fully charged. If the reading is 12 volts or less, then the battery needs charging or needs to be replaced with a new one. To be certain, you can remove the battery and take it to your local auto parts store for testing. See our article on Battery Replacement for more information.

When the car is running, the alternator should be outputting anywhere from about 12.5 volts to about 14.5 volts. If you don't see any significant change in the voltage after you start up the car, then your alternator could be faulty. If the voltage is high at the battery (around 17 volts or higher), then the alternator's regulator is likely faulty and needs to be replaced. Overcharging the battery at these higher levels may cause it to overflow and leak acid all over the inside of the battery tray. I have cleaned these out before and it is not a fun job.

A quick word on safety. Do not ever disconnect the battery ground strap from the battery while the car is running. The battery acts as an electrical capacitor and filter on the entire electrical system, and the car's electrical components expect it to be there, even if it doesn't hold a charge. Disconnecting the battery terminals while the engine is running can seriously damage the computers and systems of the car.

Automotive batteries are not typically deep cycle batteries, which means they do not like to be fully discharged. If you leave your lights on and drain your battery several times, then you will weaken it each time and have to replace it sooner than later.

You should choose a quality battery charger with an automatic shut-off function. Pelican Parts is proud to offer a range of CTEK battery chargers, ranging in price from $70-140. These battery charger will usually have two or more amperage settings. Typically, you want to charge a battery at the lowest amperage. This will take a while to do, but it is safer than running a charger at higher amperage. You should only use the higher amperage settings on a charger if you need to start the car and the battery is weak.

Probably the best way to protect your battery from draining is to install a trickle-charger / battery maintainer on it. This charger plugs into the wall when you are not using the car, and constantly monitors the battery, charging it as needed when the voltage runs down. Every car battery has internal electrical leakage that will cause it to become fully discharged over time if not properly maintained. A trickle charger can keep your battery fresh year-round, even if you don't drive the car for months at a time. Beware of cheap chargers though, as they can accidentally overcharge your battery, causing more harm than good. The trickle charger I like to use in all of my cars is the Battery Tender, available for $40-$60 at PelicanParts.com.

To jump start the Cayenne, remove the access panel on the right side of the engine compartment and flip open the red cover over the positive terminal. Attach the positive "+" side of the jumper cables to the terminal. Now attach the other side to the positive terminal on the car with the good battery. Attach the negative side of the jumper cables to the negative "-"  post on the car with the good battery. Attach the other end to the negative terminal on the Cayenne.

Now start the car with the good battery and rev the car up to around 2000RPM. This will help provide more electricity to the Cayenne's weak battery. Let it sit for a minute or two and try to start the Cayenne. Note that when removing the cables, the procedure is in reverse of installing them

Open the hood and remove the access panel on the right side of the engine with the battery symbol on it (green arrow).
Figure 1

Open the hood and remove the access panel on the right side of the engine with the battery symbol on it (green arrow). It pulls right off.

Below the panel are the connection lugs to either jump start or charge the battery.
Figure 2

Below the panel are the connection lugs to either jump start or charge the battery. The green arrows points to the positive connection while the yellow arrow points to the negative connection. The positive connection is normally covered by a red access door. This was missing from our project car. Simply pop the door open and swing it back to access the connection.

It is important that you use a quality battery charger when charging the system.
Figure 3

It is important that you use a quality battery charger when charging the system. Most modern chargers will have an automatic shut-off function and monitor the charging rate. Use the higher amperage settings only when jump starting the car.

Connect the battery charger or jumper cables to the connection points starting with the positive terminal first (green arrow) and then the negative.
Figure 4

Connect the battery charger or jumper cables to the connection points starting with the positive terminal first (green arrow) and then the negative.

You can also test the battery voltage from the connection points as shown here.
Figure 5

You can also test the battery voltage from the connection points as shown here. As you can see in the photo, our project car had a battery that would not charge beyond 10V and required replacement. See our article on Battery Replacement for more information.

One way to cut down on power usage when the doors are open is to manually actuate the door latches.
Figure 6

One way to cut down on power usage when the doors are open is to manually actuate the door latches. This tricks the cars computer into thinking that the doors are closed. I would also tape a note to the door handle, reminding you to release the latch before closing the doors.

Shown here is the latch for the front hood.
Figure 7

Shown here is the latch for the front hood. Just stick a screwdriver in and press the latch down. Don't forget to pull the hood release handle before closing the hood.

The battery tender is a great way to maintain the battery charge on your Cayenne when not driving.
Figure 8

The battery tender is a great way to maintain the battery charge on your Cayenne when not driving. They are easily installed on the battery terminals and have a quick disconnect that allows you to plug it into a standard home electrical outlet. These are available from Pelican Parts for around $40-60.

CTEK battery chargers maximize the life of your battery through a series of 4 to 8 steps in an unique charging process.
Figure 9

CTEK battery chargers maximize the life of your battery through a series of 4 to 8 steps in an unique charging process. They constantly monitor the condition of the battery. When required, they take appropriate action: desulphating, reviving, charging, conditioning and maintaining. They also regulate the charge voltage to protect sensitive and expensive electronic and audio equipment. Some CTEK chargers recondition and help revive dead batteries. Others even have a backup power supply mode, so you can change your vehicle's batteries without losing its program settings. CTEK chargers are available right here on Pelican Parts.

When jump starting the Cayenne, attach the positive side of the jumper cables to the positive terminal as shown here.
Figure 10

When jump starting the Cayenne, attach the positive side of the jumper cables to the positive terminal as shown here. Then attach the other end of the jumper cables to the car with a good battery. Start the Now attach the other side to the positive terminal on the car with the good battery.

Attach the negative side of the jumper cables to the negative post on the car with the good battery.
Figure 11

Attach the negative side of the jumper cables to the negative post on the car with the good battery. Now attach the other end to the negative terminal on the Cayenne. Start the car with the good battery and rev the car up to around 2000RPM. This will help provide more electricity to the Cayenne's weak battery. Let it sit for a minute or two and try to start the Cayenne. Note that when removing the cables, the procedure is in reverse of installing them

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Comments and Suggestions:
Trd4me Comments: No ignition lights and wont start after chargig battery
December 1, 2016
Ramone Comments: I have a 2005 porsche cayenne and it sat for 5months and the battery was dead . I've jump started it 2xs and drove it for a couple hrs without any power issues. But as soon as I turn the truck off it goes back to completely dead. What could this be?
November 19, 2016
  Followup from the Pelican Staff: A faulty battery. - Nick at Pelican Parts  
John Comments: I have a 2004 cayenne turbo
Can you advise me were I could get the in tank cartridge repaclment fuel filters rather than buy the whole filter body
Regards john
September 19, 2016
  Followup from the Pelican Staff: If available, from pelican. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Plima311 Comments: Why if everyone has the same list of problems with Porsche about their faulty wiring from the battery to the alternator to the starter being not thick enough or can't carry the current correctly... Why didn't they recall all of these to replace the cable? I feel a reputable company that is Porsche would have fixed this persistent issue for free. Especially since I've seen a lot of people complaining about the same issue I'm experiencing.
July 9, 2016
  Followup from the Pelican Staff: You will have to follow up with Porsche about it. Maybe they will release an update bulletin, impossible to guess at how they will handle it. - Nick at Pelican Parts  
Tony4s Comments: Great articles! My own issue is similar - my 2006 Cayenne's battery recently dead. After jumping the battery a bunch of problem areas surfaced: my rear hatch won't lock and neither would the glass portion; the rear wipers do not work; the right/rear lights won't work only turn signal; my sunroof won't work; my power windows won't open/close by themselves - I have to mesh the button down to open/close. Any ideas???
May 31, 2016
  Followup from the Pelican Staff: Sounds like the terminals were crossed, maybe blowing fuses or shorting a control unit. I would check fuses and check for fault codes. - Nick at Pelican Parts  
ronald4038 Comments: Hello my Original Battery went Bad i Put a different Battery and is giving me an error on the Radio there is no Audio and its giving me this message Amplifier not available
April 3, 2016
  Followup from the Pelican Staff: The fuse may have been blown during battery replacement. Check the fuses for the amp and radio. - Nick at Pelican Parts  
DrAnn Comments: Fault codes P0864 and P0865 came up, car still won't start pls HELP
Dr Ann, porsche cayenne 2006
November 19, 2015
  Followup from the Pelican Staff: Those codes point to the trans range switch. Check if it is functioning correctly. - Nick at Pelican Parts  
DocAnn Comments: I fixed my radiator fan, after the fix the car refused to accelerate thereafter it went into limpmode and refused to start, porsche cayenne 2006, pls HELP
November 11, 2015
  Followup from the Pelican Staff: This could be due to something left unplugged or detached. Check the wiring and ducts. I would also check the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
bugman Comments: my daughter has a 2006 Porsce/Cayenne;she let the battery go dead and I can't get the hood tov open to jump it.
September 7, 2015
  Followup from the Pelican Staff: in the fuse box there is a small red handle. Pull it out to expose a post, apply 12 volts to post, open hood.


- Nick at Pelican Parts
 
jj Comments: 2004 Porsche Cayenne dead battery the electric latch won't work to open the hood can't move the seat to get to the battery and fuse box does not have the pull out tab to power up the electric latch. # genius
August 8, 2015
  Followup from the Pelican Staff: You can add power through the fuse box to get the hood open. Use fused power and ground to the chassis. - Nick at Pelican Parts  
Sam Comments: Hi,
I replaced my 2005 cayenne battery, but when I put the new one nothing happen, no light came on the dashboard that shows the car had a new battery, do I need to reset something or do something else for the new battery works?
July 17, 2015
  Followup from the Pelican Staff: Check that the cables are connected correctly. - Nick at Pelican Parts  
nadeem Comments: Hi, great article. I have a 2009 cayenne s and having starting trouble. Changed the battery, problem was resolved for a few weeks and then started again. Changed battery again, problem resolved and then started again after few weeks. The engine half turns over but does not start untl about 4-6 tries. I sometimes get the chassis fault sign also during this time. Vault meter test suggests battey and alternator are fine. Showed two different mechanics, one said its the starter, other said its the alternator. Is there any other tests i can do myself for the alternator?
July 3, 2015
  Followup from the Pelican Staff: You can test charging system voltage current. This is the best bet if you suspect the alternator. - Nick at Pelican Parts  
Jetson Comments: What is the best way to attach the battery trickle charge on a 2006 cayenne, through the cigarette lighter or attached to the terminals under the hood? Gaining access to the battery requires removal of the seat and is not practical for trickle charging, thanks.
June 22, 2015
  Followup from the Pelican Staff: Directly to the battery or the jump start terminals. - Nick at Pelican Parts  
Jos Comments: Hi, the battery in my Cayenne v6 2009 was low and the cayenne start with dificulty, when it start, many system and light ave problem. Most of this trouble are ok after some kilometrage but all the buttons on the steering wheels and command on the column turn light, cruise, ... are not working. What do think about that? Thank you!! Excuse for my english!!
May 9, 2015
  Followup from the Pelican Staff: The car appears to be in transport mode. You will need somebody with a Porsche scan tool to perform a "vehicle handover" after replacement of the battery. That should bring those back. - Casey at Pelican Parts  
Mike Comments: I have to store my Cayenne in a parking area that doesn't have electrical outlets to allow use of a trickle charger. Is there a way to keep the computers online and remove/disconnect the battery? Thanks Mike
April 15, 2015
  Followup from the Pelican Staff: No. If you remove thew battery, everything is discharged. - Nick at Pelican Parts  
Lee Comments: What would be the minimum required peak and crank amps for a portable jump starter? Would the Clore JNC660 1700 peak amps and 425 crank amps suffice or would an even more powerful unit be required?
February 18, 2015
  Followup from the Pelican Staff: Yes, those numbers sound good for a portable jump pack. - Nick at Pelican Parts  
Mike1718 Comments: Do I need to reprogram the system if I'm using the same kind of batteries when replacing them? When googling I found "Battery replacement must be communicated to the gateway using PIWIS Diagnosis Tester".
November 26, 2014
  Followup from the Pelican Staff: Yes. It is the age of the battery and charge patterns that have to be reset. - Nick at Pelican Parts  

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