Acura CSX. Manual — part 369
04
System Communication
18-60
TPMS
Control Unit
(With Radio Frequecy Antenna)
Tire Pressure Sensor
(Sensor-transmitter with acceleration sensor)
• When the vehicle is traveling more than 45 km/h (28 mph), an RF (radio frequency) band wave signal is transmitted
from each tire pressure sensor to the control unit.
• When the wheels rotate, and the tire pressure sensors momentum is detected, switching them from sleep mode to
normal function (awake) mode. After the vehicle is stationary for 5 minutes, the sensors switch from normal
function mode back to sleep mode to extend their battery life.
• Each tire pressure sensor has its own ID to prevent jamming by similar systems on other vehicles. After memorizing
all the sensor IDs, the control unit recognizes only those specific signals.
• An ID cannot be memorized automatically. The control unit knows which ID belongs to each tire pressure sensor.
This recurring ID confirmation prevents any confusion in the system as a result of normal tire rotation.
NOTE: Be careful not to bend the brackets on the TPMS control unit: Misalignment of the control unit could interfere
with sending and receiving signals.
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18-61
Circuit Diagram
BATTERY
UNDER-HOOD
FUSE/RELAY BOX
G1
H1
WHT
3
6
IGNITION SWITCH
No. 10
(7.5 A)
No. 2
(60 A)
No. 2
(50 A)
No. 1
(100 A)
No. 7
(7.5 A)
UNDER-DASH
FUSE/RELAY BOX
G19
D2
TPMS INDICATOR
ECM/PCM
WHT
RED
WHT
RED
BLK
TPMS CONTROL UNIT
CAN
CONTROLLER
RED
WHT
RED
WHT
VOLTAGE
REGULATOR
8
10
IG1
B
BRN
3
GND
BLK
G502
G504
K-LINE
: 12 V
: 5 V
CAN H
CAN L
IG1
POWER CIRCUIT
INDICATOR
DRIVER
CIRCUIT
IG1 HOT in ON (II) and START (III)
DATA LINK
CONNECTOR (DLC)
LT BLU
BLU
RED
BLU
2
11
LOW TIRE PRESSURE
INDICATOR
GAUGE CONTROL MODULE (TACH)
1
A36
A37
19
6
14
7
4
7
Q10
Q9
MICU
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02
18-62
TPMS
DATA LINK CONNECTOR (DLC)
TPMS CONTROL UNIT 20P CONNECTOR
UNDER-DASH FUSE/RELAY BOX CONNECTOR Q (16P)
ECM/PCM CONNECTOR A (44P)
GAUGE CONTROL MODULE (TACH) 36P CONNECTOR
Wire side of female terminals
Terminal side of female terminals
Wire side of female terminals
Wire side of female terminals
Terminal side of female terminals
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−
−
−
−
−
−
DTC 11, 13, 15, 17:
YES
NO
DTC
Tire Pressure Sensor Number
YES
NO
YES
NO
18-63
DTC Troubleshooting
Tire Low Air Pressure
NOTE: If low tire pressure is detected, the control unit
sets one or more of these DTCs, and turns on the low
tire pressure indicator. If the low tire pressure indicator
comes on because of a low tire pressure, and the client
corrects it before bringing the vehicle in, the DTCs will
be stored, but the indicator turns off.
1. Turn the ignition switch to LOCK (0).
2. Make sure the tires are inflated to the specified tire
pressure listed on the doorjamb sticker.
3. Test-drive the vehicle at 45 km/h (28 mph) or more
for at least 1 minute.
The system is OK at this time. Check for and
repair the cause of air loss.
Go to step 4.
4. Check for DTCs with the HDS.
5. Note the tire pressure sensor(s) number by the
indicated DTC.
11
No. 1
13
No. 2
15
No. 3
17
No. 4
6. Do the tire pressure sensor location procedure to
determine the affected tire location and relate it to
the tire pressure sensor number (see page 18-53).
7. Check the TIRE 1, TIRE 2, TIRE 3, or TIRE 4 AIR
PRESSURE in the TPMS DATA LIST with the HDS,
and compare it with the actual measured tire
pressure.
Go to step 8.
Replace the appropriate tire pressure sensor
(see page 18-76).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle at 45 km/h (28 mph) or more
for at least 1 minute.
10. Check for DTCs with the HDS.
Replace the TPMS control unit (see page
18-75).
If any other DTCs are indicated, troubleshoot
the appropriate DTC. If no DTCs are indicated, the
system is OK at this time.
Does the low tir e pr essur e indicator go of f ?
Is the indicated tir e pr essur e on the HDS within
40 kPa ( 0.4 kgf / cm , 6 psi) of the actual tir e
pr essur e?
Is DT C 11, 13, 15, or 17 indicated?
2
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