Functional Check

Switch on seat heater for about 10 seconds with maximum heating power. After switching seat heater off, measure voltage at control unit. The measurement must now be considerably higher.

Fig 1: Calibrating Heater Control Unit

Courtesy of PORSCHE OF NORTH AMERICA, INC.

HEATER CONTROL UNIT CALIBRATION

Ambient Temp. °F (°C)	Voltage
32 (0)	1.50
35.6 (2)	1.55
39.2 (4)	1.60
42.8 (6)	1.65
46.8 (8)	1.70
50.0 (10)	1.75
53.6 (12)	1.80
57.2 (14)	1.85
60.8 (16)	1.90
64.4 (18)	1.95
68.0 (20)	2.00
71.6 (22)	2.05
75.2 (24)	2.10
78.8 (26)	2.15
82.4 (28)	2.20
86.0 (30)	2.25
89.6 (32)	2.30
93.2 (34)	2.35
96.8 (36)	2.40
100.4 (38)	2.45
104.0 (40)	2.50
107.6 (42)	2.55
111.2 (44)	2.60
114.8 (46)	2.65
118.4 (48)	2.70