Seat Temperature Element: Testing and Inspection

Seat Heater Activation, Testing

Special tools, testers and auxiliary items required

• Test Box 105 Pin (V.A.G 1598/42-1) and Test Adapter (V.A.G 1598/47)

• Vehicle Diagnostic, Testing and Information System (VAS 5051 A) with Multimeter Leads (VAS 5051/7)

• The Heater Control Module (J65) provides a voltage via the Heated Driver Seat Adjuster (E94) and Heated Front Passenger Seat Adjuster (E95) (a potentiometer is operated via the respective knurled wheel - C -).






• The voltage supplied by Heater Control Module (J65) - A - with seat heater switched on is dependent on the knurled wheel position and on the vehicle voltage supply, it is in the range of less than 0.5 volts in position 0 to approximately 10 volts in position 5 (measured to Ground -GND-, for example at connector - B - terminal 20) with engine running. The voltage is transferred via connector - B - (from terminal 11 to Driver Seat Heater Control Module (J726) and from terminal 15 to Front Passenger Seat Heater Control Module (J727) ).






• Resistance of seat heater potentiometer is dependent on the knurled wheel position, it cannot be measured using workshop equipment.

• Check function of seat heater and service it.

• Beginning with MY 2009 and as a running change, seat heating control modules are being installed that control the seat heating temperature at a lower characteristic curve. Refer to Electronic Parts Catalog (ETKA).