Customer wants to run rear tires at 60psi instead of the recomended 80 psi. Can the tire pressure values in the computer be reset so the tire pressure light stays off?

because it is a low profile tire with a wide tread , the 30 psi is a recommended pressure for a standard size tire
however at 30 psi you will probably find that it will wear with an under inflated wear pattern and the 40 psi is used to sit the tread flat on the road
best talk with a good tire shop as they have experience and reports form a vast range of customers who talk about the pressures they run to get the best wear from the tires
the tires I run are standard and the recommended pressure is 32 psi but the make of tire actually runs best on 38 psi and that comes from the tire manufacturer

I found this on another site, it may help to understand what is happening, I also saw that there is a problem with the valve stems cracking since they're made out of aluminum and causing that problem. Here's the explanation provided on another site:

RodneyJ Answered 6 years ago
If a customer with a 2005 or later DaimlerChrysler vehicle equipped with Tire Pressure Monitoring (TPM) is concerned that the TPM lamp is on continuously, please be sure to inform the customer that the system is in place to warn of a low tire pressure situation, and a system diagnosis may not be required. The customer should be aware of the following: The Tire Pressure Monitoring (TPM) System will warn the driver of a low tire pressure based on the vehicle recommended cold placard pressure (the placard is located on the drivers side B-pillar).
The tire pressure will vary with temperature by about 6.9 kPa (1 psi) for every 6.5 Degrees C (12 Degrees F). This means that when the outside temperature decreases, the tire pressure will decrease - the customer should adjust his tire pressure for this decrease in pressure - please refer the customer to his vehicle owner's manual for information on how to properly inflate his vehicle's tires. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure.
The TPM System will warn the driver of a low tire pressure if the tire pressure falls below the low pressure warning threshold for any reason, including low temperature effects.
The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off until the tire pressure is at or above recommended cold placard pressure. Once the low tire pressure warning has been illuminated, the tire pressure must be increased to the recommended cold placard pressure in order for the TPM warning lamp to be turned off. The system will automatically update and the TPM warning lamp will extinguish once the updated tire pressures have been received. The vehicle may need to be driven for up to 10 minutes above 25 kph (15 mph) to receive this information.


FOR EXAMPLE:

A 2006 300 has a recommended cold (parked for more than 3 hours) placard of 207 kPa (30 psi).

If the ambient temperature is 18 Degrees C (65 Degrees F) and the measured tire pressure is 186 kPa (27 psi) the TPM lamp will be OFF.

IF NOTHING IS DONE TO THE AIR PRESSURE IN THE TIRES and the ambient temperature drops to 20 Degrees F (-7 Degrees C) while the vehicle is parked, the approximate tire pressure will be 157 kPa (23 psi) and the TPM lamp will be ON.

IF THE VEHICLE IS DRIVEN TO REACH NORMAL OPERATING TEMPERATURE

WITHOUT ADJUSTING THE AIR PRESSURE and the ambient temperature stays at -7 Degrees C (20 Degrees F), the approximate tire pressure will rise to 186 kPa (27 psi) and the 1PM lamp will be ON.

To turn the TPM lamp OFF the tires must be inflated to the vehicle recommended cold placard pressure.

In order to properly maintain vehicle tire pressure, please refer to the owner's manual for additional information regarding tire inflation.

NOTE :Tire pressure should always be set based on cold inflation tire pressure (defined as the tire pressure after a vehicle has not been driven for more than 3 hours - and in outside ambient temperature).

Seasonal temperature changes will affect tire pressure, and the TPM system will monitor the actual tire pressure in the tire.
If a diagnosis of the system is required (for example, the lamp did not extinguish, or the lamp is flashing), please refer to service information available in TechCONNECT for additional information for TPM diagnosis. Please be aware that if the Wireless Control Module (WCM) is replaced, the TPM placard values may need to be reprogrammed. The TPM placard values do NOT need to be updated if the WCM has NOT been replaced, the TPM placard values are properly set at the factory.

By operating the tire pressure warning reset switch, the tire pressure warning ECU can be set to issue a warning at an inflation pressure that corresponds to the standard pressure of tires .Therefore, you must set the warning threshold to the proper value in order to comply with the local regulations .Operate the tire pressure warning reset switch only after the inflation pressures of all tires have been adjusted on the vehicle.To initialize the system, press and hold the tire pres- sure warning reset switch for 3 seconds or longer with the ignition switch in the ON position. When the system receives the
initialization signal, the warning light blinks 3 times (1 second on, 1 second off). During initialization, the tire pressure warning valve and transmitter measures the inflation pres sure of the tire, and registers the signals that are transmitted into the tire pressure warning ECU at a frequency of once per minute. The initialization process is completed when signals from all the tires have been received. It takes a few minutes .

Tire size Inflation Front Inflation Rear
P 195/65 R15 89S 30 psi 30 psi
195/65 R15 91H

P 205 /55 R16 89H 32 32 psi
P 215/45 R17 87W
205/55 R16 91V

The recommendation is 26 PSI front and rear tire pressure for the 1993 Audi 80.
See
http://www.etyres.co.uk/tyres/audi
Please rate this solution. Thanks.

Check to see if the sensors are reconnected. If they are, lower rear tire pressure to 55 to 60 and recheck status light. You will have to turn the engine off and back on to reset.

That is a stretch but it has worked for me on other Chev models.

P.S. Confirm 55 x units mbar KPa Psi with tire pressure gauge.

Typically a tire pressure monitoring system uses an indirect measurement, and only measures the differences between the pressure in all of your tires. It does this by monitoring the speed at which the wheels are rotating. If one of the tires has low pressure, it will have to spin faster than the others, because the tire is partially flat, and the diameter of the tire is smaller.
If you are running different tire pressures in the front and back tires, then it might trigger the light to come on.
This might also be due to uneven tire wear or different size tires on the front and back.
Check the tire wear, and temporarily run equal tire pressure in the front and rear. It might take a few miles for the light to reset, so give it some time.

well you can find the max tire pressure on the tire it self. it should say psi xx

On the driver door opening decal the recommened tire pressures if not there its in the rear door opening and it's in the owers manuel under tires. The kind of whells or options need to be obserbed as the differt options may have different recomended pressures and the rear may have a different than the fornt if all the stickers are gone and the owers manuel is too 32 PSI is a safe best bet some 50 or 45 series tires need as much as 45PSI never put more pressure in the tire than what it says on the sidewall but the maximun pressure is safe but might not give the best ride quailty

31 front 32 rear


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This is a driver preference issue the tire manufacturer always recomends higher air pressures because they want you to obtain optimum performance, the car company manufacturer recomends the tire pressure that will give the smoothest ride I prefer the middle of the two, tire companies 40 psi automobile companies 28 - 32 psi I recommend 36 psi all around front and back.