Seat Temperature Element: Service and Repair
Heater pad backrest and cushion, replacing
Special tools:
115 8962 CRIMP PLIERS 115 8962 Crimp Pliers
The illustrations in this service information are used for different model years and / or models. Some variation may occur. However, the essential information in the illustrations is always correct.
Preparations
Remove the seat. See Upholstery back rest, replacing Upholstery Backrest, Replacing.
Note! The old heating pad must be removed before a new one is installed. A new heater pad must not be bonded over the old pad.
Note! Read through the entire method before beginning work.
The following heater pad versions are available:
- heater pad and seat belt reminder
- heater pad only
- seat belt reminder only.
Removing the heater pad from the backrest and cushion
Removing upholstery
Remove the upholstery. See Upholstery seat cushion, replacing Upholstery Seat Cushion, Replacing or Upholstery back rest, replacing Upholstery Backrest, Replacing (2003) or Upholstery seat cushion, replacing Upholstery Seat Cushion, Replacing (2004-).
Note! Cut off the half moon clips and remove any remaining parts of the clips.
Note! Do not bend the upholstery rods more than is necessary to detach the upholstery. Straighten the rods before reinstalling the upholstery.
Removing old heater pads
Carefully heat the old heater pad to remove it.
Note! Ensure that the foam filling is not damaged when removing the heater pad. Ensure that the pad is detached from the foam filling. This is to prevent functionality problems when the new heater pad is installed.
Note! Damaged foam filling must be replaced. This to guarantee function. This also applies if there are cracks in the backrest or seat frame.
Installing the heater pad on the backrest and cushion
Installing new heater pads
Note! The heater pad must be correctly positioned so that the when the half moon clips are secured they are not too close to the heating loops or the surface of the heater pad.
Position the heater pad in the correct position. Do not remove the backing from the adhesive surfaces.
Secure one half of the heater pad. Fold up the other half.
Pull the backing (or part of the backing) off the adhesive surface closest to the center of the section of the heater pad that is bent up.
Carefully bring the adhesive surface down onto the foam filling. Work with small sections at a time. Start from the center and work out towards the edges.
Continue in the same way with the other adhesive surfaces.
If the heater pad terminates at the channel, position it as illustrated.
Note! The end of the pad must not be up on the flat surface.
If the heater pad is the type where the pad and/or cable is placed in the channel, the pad must follow the foam filling as illustrated. If not, the pad and/or cable may be loaded and damage the pad. The type of seam on the upholstery may cause wear in the long term.
Note! There must not be any bubbles or kinks when the heater pad is bonded to the foam filling. This increases the risk of damage to the pad during use. This applies to the entire surface, but to the heating wires in particular.
When the heater pad has been bonded into place the positional straps (shaded in the illustration) must be cut apart. This only applies to those types of heater pads that have positional straps.
Note! The positional straps must not be cut before bonding is complete.
Installing upholstery
Before securing the upholstery, check the following:
- that any remnants of the half moon clips have been removed
- that the rods (steel or plastic wire in the pockets inside the upholstery) are in position and not protruding outside the pleats
- that the rods or the rod pleats are not bent or in contact with the heater pad. Adjust if necessary
- that the seam and the rods and pleats are positioned in the channel so that they are not in contact with the heater pad
- that the plastic wires are the correct length and cannot affect the function of the heater pad.
Install the upholstery. See Upholstery seat cushion, replacing Upholstery Seat Cushion, Replacing or Upholstery back rest, replacing Upholstery Backrest, Replacing (2003) or Upholstery seat cushion, replacing Upholstery Seat Cushion, Replacing (2004-).
Testing the bonding
This test can be performed either with the upholstery completely removed or with it partially in position.
Press at those points illustrated. Check that the heater pad follows the compression of the cushion.
There must be no kinks or other defects in the heater pad when it is pressed.
Function test:
Start the seat heater and check the function.
Note! This test is not possible if the ambient temperature is too high.
Install the seat. See Upholstery back rest, replacing Upholstery Backrest, Replacing.