: Rotating Tires



bigdog9586
05-06-07, 04:49 PM
I wonder what is involved in tire rotation on the STS as each tire has it's readout for pressure on the dash display. Does this mean I have to take it to Cadillac to have the tires rotated if I want the readouts for each tire to be acturate or is there a way we can do it ourselves?:banghead:

dkozloski
05-06-07, 05:16 PM
My STS has staggered tire sizes so they can't be rotated anyway.

ewill3rd
05-06-07, 05:58 PM
You CAN do it yourself, it is a pain.
STS has different size tires front to rear, you cannot rotate them.
Programming tire sensors is simple but can take a few minutes if you really want to do it let me know.

bigdog9586
05-06-07, 06:15 PM
Yes I would like to know as my STS4 V6 2007 came with 235-50/17's all the way around. I believe I read somewhere that GM made that as one of their 07 changes due to complaints from their customers except for the V models.
=====================

You CAN do it yourself, it is a pain.
STS has different size tires front to rear, you cannot rotate them.
Programming tire sensors is simple but can take a few minutes if you really want to do it let me know.

WillySTS
05-06-07, 09:00 PM
You CAN do it yourself, it is a pain.
STS has different size tires front to rear, you cannot rotate them.
Programming tire sensors is simple but can take a few minutes if you really want to do it let me know.

You can rotate from side to side if your tires are not directional, which they should not be.

Caroutisine
05-06-07, 09:43 PM
It can be done if the tires are the same size. I don't think the side to side rotation is recommended. I swap between winter and summer tires/rims. There is a simple procedure in the owners manual on how to program the tire sensors. In involves dropping the pressure in each tire and getting confirming "beeps" from the car.

Heavy_Metal
05-06-07, 10:27 PM
I also need to rematch my tire pressure sensors because I got new tires and the wheels were not put back in the same position. I changed to the same size tires for front and back so I will be rotating periodically.

The process in the manual for matching the pressure sensor position requires adding air to each tire in a certain sequence, so I will need access to nitrogen every time I rotate tires.

:cookoo:

dkozloski
05-06-07, 10:56 PM
I also need to rematch my tire pressure sensors because I got new tires and the wheels were not put back in the same position. I changed to the same size tires for front and back so I will be rotating periodically.

The process in the manual for matching the pressure sensor position requires adding air to each tire in a certain sequence, so I will need access to nitrogen every time I rotate tires.

:cookoo:

You should be able to go to your local welding supply store and lease a bottle of N2. You can also purchase bottles but you won't be able to exchange it for a full one when you empty it. They'll probably have to send it off somewhere and there'll be a delay. The bottles come in various sizes. They should also be able to supply a regulator, hose, and fittings.

Caroutisine
05-06-07, 11:22 PM
I will need access to nitrogen every time I rotate tires.
:cookoo:
LOL
:D

ewill3rd
05-07-07, 07:23 AM
You CAN do side to side rotations but it is not necessary or recommended.

Try this.
Put the vehicle in accessory mode with the ignition switch.
Hold the lock and unlock buttons simultaneously on the RKE transmitter.
After several seconds the horn should honk.
The left front marker lamp should turn on, let air out of the tire for approximately 8-10 seconds, then wait a few more, the horn should chirp, the right front marker light will come on, move to the right front tire and repeat this procedure.
The RCDLR is looking for a 1.6 psi decrease OR increase in tire pressure to identify the transmitter in the location indicated by the lights.

After the 4th tire there should be a double chirp of the horn, although sometimes there is only one.

Programming order is LF, RF, RR, LR.

HTH
(you may have to additionally set the parking brake and/or put the vehicle in run mode)
Run mode is accessed by holding the ignition rocker switch in the down position for about 10 seconds.

WillySTS
05-08-07, 01:10 AM
You CAN do side to side rotations but it is not necessary or recommended.


True dat, but if you watch your tires as closely as I do, there is a need for it.

My front tires were starting to feather away from the direction of rotation. Pressures are perfect and alignment is right on stock specs...(I haven't even dialed in my own specs yet). After approx 1,000 miles of driving, the feathering is nearly gone. The rear tires were ok, no doubt due to the burnouts, but I switched them anyway. I used to do the same on my '99 Seville with 2005 STS 17's on it with staggered sizes with good results over the 2 years with those wheels.

Heavy_Metal
05-17-07, 12:22 AM
Try this.
Put the vehicle in accessory mode with the ignition switch.
Hold the lock and unlock buttons simultaneously on the RKE transmitter.
After several seconds the horn should honk.
The left front marker lamp should turn on, let air out of the tire for approximately 8-10 seconds, then wait a few more, the horn should chirp, the right front marker light will come on, move to the right front tire and repeat this procedure.
The RCDLR is looking for a 1.6 psi decrease OR increase in tire pressure to identify the transmitter in the location indicated by the lights.

After the 4th tire there should be a double chirp of the horn, although sometimes there is only one.

Programming order is LF, RF, RR, LR.

HTH
(you may have to additionally set the parking brake and/or put the vehicle in run mode)
Run mode is accessed by holding the ignition rocker switch in the down position for about 10 seconds.

Thanks ewill3rd for the instructions but I still can't get it to work. I read the procedure in the owner’s manual also.

I went and got 40psi of N2 in each tire and started the procedure as described, but all I get is a double honk when I should get a single honk. I did the park break, acc, lock, unlock, holding the lock and unlock at the same time, then I get the double honk and no blinking LF marker lamp either. I tried to let out 3psi after the double honk and then waited, but I get no response.

What am I missing???

ewill3rd
05-17-07, 06:22 AM
Sorry for any trouble, here is the procedure and other info straight from the manual.


Tire Pressure Sensor Learn
Learn Mode Description
The tire pressure monitor (TPM) system uses the remote control door lock receiver (RCDLR), keyless entry transmitter(s), instrument panel module (IPM), horn, 4 radio frequency transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every tire rotation, RCDLR replacement, or sensor replacement. Once the learn mode has been enabled, each of the sensors unique identification codes can be learned into the RCDLRs memory. When a sensors ID has been learned, the RCDLR sends a serial data message to the IPM to sound a horn chirp. This verifies the sensor has transmitted its ID and the RCDLR has received and learned it. The RCDLR must learn the sensor IDs in the proper sequence to determine correct sensor location. The first learned ID is assigned to the left front location, the second to right front, the third to right rear and the fourth to left rear.

Sensor Functions Using Pressure Increase/Decrease Method
Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tire pressure increases, or decreases by more than 11 kPa (1.6 psi) from the last pressure measurement, another measurement will occur immediately to verify the change in pressure. If a pressure change has indeed occurred, the sensor transmits in re-measure mode. When the RCDLR receives a re-measure mode transmission while in TPM learn mode, it will assign that sensor's ID to the location on the vehicle relative to the order in which it was learned.

Sensor Functions Using J-46079
Each sensor has an internal low frequency coil. When the J-46079 Tire Pressure Monitor Diagnostic Tool is used in activate mode it produces a low frequency transmission that activates the sensor. The sensor responds to an low frequency activation by transmitting in learn mode. When the RCDLR receives a learn mode transmission while in TPM learn mode, it will assign that sensor's ID to the location on the vehicle relative to the order in which it was learned.

Learn Mode Cancellation
The learn mode will cancel if more than 2 minutes have passed and no sensor have been learned, or if more than 5 minutes has passed for the entire procedure. If the learn mode is canceled before any IDs are learned, the RCDLR will remember all previously stored IDs and their locations. As soon as the RCDLR learns the first ID, all other IDs are erased from the RCDLRs memory.

TPM Learn Procedure
Important: If using the pressure increase/decrease method, the following procedure must be completed within 15 minutes from when the vehicle is stationary after being driven at 32 km/h (20 mph), or greater, for 10 seconds.

Important: Before proceeding with the steps below, ensure that no other learn procedure is being performed simultaneously, or that no tire pressures are being adjusted on another TPM equipped vehicle within close proximity.

Place the ignition switch in the proper position:
• With electronic keyless ignition, place the switch in the ACCY position

• With standard ignition, place the switch in the RUN position

Simultaneously press the keyless entry transmitters lock and unlock buttons until a horn chirp sounds or use the scan tool and select Module Setup, Remote Control Door Lock Receiver, TPM Learn Mode, and then the Enable soft key. A horn chirp will sound indicating the mode has been enabled. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall.
Starting with the left front tire, hold the antenna of the J-46079 against the tire sidewall close to the wheel rim at the valve stem location then press and release the activate button and wait for a horn chirp, or increase/decrease the tire pressure for 5-8 seconds then wait for a horn chirp. The horn chirp may occur before the 5-8 second pressure increase/decrease time period has been reached, or up to 30 seconds after the 5-8 second pressure increase/decrease time period has been reached.
After a horn chirp has sounded, proceed as in step 3 for the next 3 sensors in the following order:
4.1. Right Front

4.2. Right Rear

4.3. Left Rear

After the LR sensor has been learned a double horn chirp will sound indicating all sensors have been learned.
With the ignition switch, select the OFF mode to exit the learn mode.
After the learn mode has been exited, adjust all tire pressures to the recommended pressure.

--------------------------------------------------------------------------------

Heavy_Metal
05-17-07, 08:42 AM
ewill3rd,

Thanks for being so helpful. Your post had additional information that was not in my owner's manual:

"Important: If using the pressure increase/decrease method, the following procedure must be completed within 15 minutes from when the vehicle is stationary after being driven at 32 km/h (20 mph), or greater, for 10 seconds."

I'll go get some N2 and try again.

ewill3rd
05-17-07, 08:49 AM
Sometimes I can't remember all the tricky stuff for the manual procedure because we have the tool at our disposal, it works much faster.

I hope it works this time.
Glad to help.
;)

Bee iLL
10-09-07, 04:08 PM
ewill3rd,

Thanks for being so helpful. Your post had additional information that was not in my owner's manual:

"Important: If using the pressure increase/decrease method, the following procedure must be completed within 15 minutes from when the vehicle is stationary after being driven at 32 km/h (20 mph), or greater, for 10 seconds."

I'll go get some N2 and try again.

Were you ever able to get this to work? I have an 07 sts-v that I cannot seem to get my new sensors to register with.