Checking temperature sensors

WARNING: This page is about a different car, the 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and equipment

Test Box V.A.G 1598A as well as corresponding Adapter V.A.G 1598/11 and Adapter - 16 Terminals V.A.G 1598/12
Diagnostic Operation System VAS 5051A (with Multimeter Leads VAS 5051/7)
Connector Test Set V.A.G 1594C

Switch off ignition.
Remove operating and display module, Climatronic Control Module J255.

Fig 1: VAG 1598 Test Box With VAG 1598/11 And VAG 1598/12 Adapter Cables

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect Test Box V.A.G 1598A with corresponding Adapter V.A.G 1598/11 to connector - C - → Wiring and component check using Test Box V.A.G 1598A .
Connect Adapter - 16 Terminals V.A.G 1598/12 to connector - D - (use second Test Box V.A.G 1598A or connect measuring instrument with suitable test lead from Connector Test Set V.A.G 1594C directly to Adapter - 16 Terminals V.A.G 1598/12) → Wiring and component check using Test Box V.A.G 1598A .

NOTE:

The terminal assignment of the connector - C - for the Adapter V.A.G 1598/11 and the connector - D - for the Adapter - 16 Terminals V.A.G 1598/12 is identical to the assignment of the sockets at the Test Box V.A.G 1598A.

Measure resistance between contact "5" in connector - C - (to Drivers Heated Seat Temperature Sensor G59) and contact "16" in connector - D - (Ground (GND) connection) at test boxes.

Specified value: Resistance greater than 1.5 kΩ (kilo-ohms) and less than 25 kΩ (depending on temperature of temperature sensor; at a seat temperature of 20 °C, measured value is approx. 10 kΩ)

Measure resistance between contact "6" in connector - C - (to Front Passengers Heated Seat Temperature Sensor G60) and contact "16" in connector - D - (Ground (GND) connection) at test boxes.

Specified value: Resistance greater than 1.5 kΩ (kilo-ohms) and less than 25 kΩ (depending on temperature of temperature sensor; at a seat temperature of 20 °C, measured value is approx. 10 kΩ)

NOTE:

The resistance of the temperature sensors in the seat heater elements changes with temperature (the values given in the table below are approximate).

Temperature at seat temperature sensor in °C	Resistance of temperature sensor in kΩ
20	10
30	6.0
40	4.2
50	2.8
60	1.7

If the resistance value is too high, check wiring to seat heater elements for open circuit or contact resistance and eliminate this. If the open circuit is in the seat, repair the seat and →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET