Cadillac 2014 ELR User Manual download pdf (Page 5)

January 2014 5

Tire Noise Diagnosis

If owners comment about noise related to the tires on their

vehicle, there are many factors to consider when performing

diagnosis. For example, the amount of tire noise may be due to

the tire design, a change from one tire brand to another, or vary

based on road speed and road surfaces.

A tire with an

aggressive tread

design will tend to

be the most noisy.

So winter tires often

will be more noisy

than all-season

tires, which have

a tendency to be

noisier than summer

only tires. This is

because of the more

aggressive tread

that is designed to

work well on ice and

snow covered roads.

Different tires also may be noisier on some surfaces than others.

In addition, larger diameter tires with shorter sidewalls, popular

on many new models today, also may tend to be perceived as

noisy, especially when compared with a previous vehicle with

smaller tires.

Compare Tires

Before tires are replaced for a noise condition, they should be

compared with a like vehicle with the same tire brand and model

to see if there is any other reason for the noise level in the vehi-

cle. If the vehicle with the tire noise concern is similar to other like

vehicles, the tires should not be replaced. Under no circumstances

should tires ever be replaced for noise levels that are consistent

from one vehicle to another. Also, a summer only tire should never

be used as a replacement tire to address a noise concern on a

vehicle equipped with all-season tires. This can create undesirable

handling conditions in icy or snowy weather.

Match TPC

Specs

A second consid-

eration when diag-

nosing tire noise

is the use of after-

market tires that do

not meet the GM

Tire Performance

Criteria (TPC)

speciﬁcation marked

on the original

equipment tires. The tires on all new production models have a

TPC rating number molded on the sidewall. The TPC rating will

appear as a 4-digit number preceded by the letters TPC SPEC on

the tire wall near the tire size.

Non-TPC marked tires may have been installed by the owner or

a used vehicle department. The tread noise of the tires is taken

into consideration as part of the engineering development and

validation of GM vehicles. If the tire performance is changed with

the installation of non-TPC aftermarket tires, noise levels may

increase considerably.

If tire noise is noticed in a vehicle that has a replacement tire

installed, another set of tires and wheels from a similar vehicle

should be installed to rule out the tires as a source of noise.

Noises from some tread designs may sound remarkably similar

to wheel bearings or driveline components, especially at lower

speeds and with the HVAC and infotainment systems turned off.

A replacement tire should have the same TPC speciﬁcation

number as the original equipment tire. This will ensure the same

size, the same load range, and the same construction as those

originally installed on the vehicle.

After diagnosis, if a customer is not satisﬁed with what is con-

sidered to be a normal tire noise level when compared with like

vehicles, the customer’s concern should be reviewed with the local

DM-Aftersales.

Thanks to David MacGillis

Larger diameter tires with shorter

sidewalls may be perceived to be noisy

compared to smaller tires.

TPC spec marked on the tire

Instrument Cluster Not

Displaying Data

The Instrument Panel Cluster on some 2014 Lacrosse models built

before December 19, 2013 and 2014 Regal models built before

January 21, 2014 may not display radio or phone data. An Audio Off

message may be displayed on the Driver Information Center and

the right audio steering wheel controls may be inoperative. In addi-

tion, the instrument cluster may intermittently display “Sport” mode

and other personalization features may return to the factory default

setting.

These instrument cluster conditions may be the result of a reset

condition within the Instrument Panel Cluster.

New Instrument Panel Cluster software has been released to

address these conditions. Use TIS2Web to update the Instrument

Panel Cluster calibrations and conﬁrm proper operation.

TIP: The updated software only applies to vehicles built before the

listed build dates if audio is still present, the radio controls still func-

tion, and no current infotainment DTCs are set.

Thanks to Christopher Crumb

On the new 2014 Silverado 1500 and Sierra 1500 trucks, a

steering column lock has been incorporated into the ignition

key housing assembly as standard equipment. If the steer-

ing wheel is turned with the ignition key in the OFF position,

it may cause excessive pressure between the lock plate and

lock pin. The next time the ignition key is rotated from the

OFF to the ON position, it may be difﬁcult to rotate the key.

The steering wheel will need to be rotated in either direction

(depending on how the locking pin engaged to the locking

plate) to alleviate the pressure between the steering col-

umn lock pin and lock plate. This will allow the ignition key

to rotate from the OFF position. The ignition key may need

to be rotated at the same time the steering wheel is being

rotated.

This is a normal characteristic of the vehicle. No additional

repairs should be made.

Thanks to Jim Will

Unable to Rotate the

Ignition Key

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