Subaru 2009 IMPREZA Service Manual page 2244

2. General Description
A: CAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
"AIRBAG"
Airbag system wiring harness is routed near the
TPM control module.
CAUTION:
• All airbag system wiring harnesses are yel-
low. Do not use the electrical test equipment on
these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the tire pressure
monitoring control module.
2. TIRE PRESSURE MONITORING
CONTROL MODULE
• If the transmitter is replaced, ID registration for
the transmitter is required. <Ref. to TPM(diag)-10,
REGISTER TRANSMITTER ID, OPERATION,
Subaru Select Monitor.>
• When adjusting tire pressure indoors in winter,
there is a big temperature difference between the
indoor facilities and outside. Once the car is outside
where the temperature is lower, the air pressure in
the tires will drop, causing the tire pressure warning
light to illuminate, even if the pressure in the tires
was adjusted to standard values indoors. To avoid
this, it is necessary to adjust the tire pressure to the
high side in consideration of the difference in tem-
perature between inside and outside according to
the following table.
P205/50R17 and P205/55R16
Indoor
Tempera-
temperature
ture
Ambient
°C (°F)
temperature
Air Front 250 (36)
pressure
Rear 240 (35)
kPa (psi)
General Description
15.5 (60)
–1 (30) –12 (10) –23 (–10)
265 (38) 280 (40)
255 (37) 270 (39)
TPM(diag)-3
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
B: INSPECTION
Before performing diagnosis, check the following
item which might affect the quality of the tire pres-
sure monitoring system.
1. TIRE
• Inspect that the tire pressure is within the speci-
fication while the tire is cool. (Refer to Tire Caution
Label.)
• Check the tires for damage or the insertion of for-
eign matters.
2. BATTERY
Check that amount of battery fluid, gravity and volt-
age are within the specifications.
Standard voltage: 12 V or more
Specific gravity: 1.260 or more