Honda Ridgeline. Manual — part 308
04
System Structure
Initiators
Control unit
Indicators
18-57
Vehicle
Initiator
(low frequency)
Initiator
(low frequency)
Gauge Control Module
6 Indicators
(LED drive)
Control Unit
(with radio
frequency antenna)
Initiator
(low frequency)
Initiator
(low frequency)
Tire Pressure Sensor
(sensor-transmitter)
Tire Pressure Sensor
(sensor-transmitter)
Wheel
(TPMS type)
Wheel
(TPMS type)
Tire Pressure Sensor
(sensor-transmitter)
Wheel
(TPMS type)
Tire Pressure Sensor
(sensor-transmitter)
Wheel
(TPMS type)
Whenever the engine is running, the TPMS control unit continuously monitors all four tires and the system. If it detects
low pressure in a tire, it alerts the driver by turning on the low pressure indicator and the appropriate tire indicator. If it
detects a problem in the system, it turns on the TPMS indicator.
Mounted on each wheel well, each initiator sends a start/stop signal to the tire pressure sensor in the tire below it.
Mounted in the lower dash on the driver’s side, the control unit sends signals to the initiators and receives signals
from them to verify the pressure sensor IDs every time the engine starts. It also receives signals from the transmitters
in the tire pressure sensors, and it continuously monitors and controls the system.
Six indicators are in the gauge control module: The low tire pressure indicator, four tire indicators to show which tire
is affected, and the TPMS indicator that comes on only if there’s a problem with the system. When two or more tire
pressures are low, the low tire pressure indicator comes on about 5 seconds before the appropriate tire indicator.
Once low pressure is detected, the system scans all four pressure sensors to ensure that it turns on the correct tire
indicator.
(cont’d)
05
Tire pressure sensor
Wheels
18-58
TPMS
System Description (cont’d)
Aluminum wheel
Steel wheel
A
B
C
Each sensor is an integrated unit made up of the tire valve stem, a pressure sensor, and a transmitter. The unit is
attached to the inside of the wheel, around the valve stem. The sensor transmits the tire pressure to the control unit
when tire pressure is less than 168 kPa (1.7 kgf/cm , 24 psi). The control unit then turns on the low tire pressure
indicator and the appropriate tire indicator(s). When that tire’s pressure is increased to more than 198 kPa (2.0 kgf/cm ,
29 psi), the transmitter sends tire pressure to the control unit, and then the control unit turns the indicators off.
TPMS will not work unless TPMS type wheels are installed on the vehicle. The original equipment wheels have these
details:
• Aluminum wheel: The wheels have counterweights (A) on the opposite side of the spoke to balance the weight of
the tire pressure sensor (B).
• Steel wheel: The wheels have a ‘‘SJC’’ stamp (C) on the outside of the flange ribs.
2
2
06
System Communication
18-59
Control Unit
(with Radio Frequency Antenna)
Initiator
(Low Frequency Initiator)
Tire Pressure Sensor
(Sensor-transmitter)
• When the vehicle is running, an RF (radio frequency) band wave signal is continuously transmitted from each tire
pressure sensor to the control unit.
• When the ignition switch is turned ON (II), the initiators send an LF (low frequency) band wave signal to the tire
pressure sensors, switching them from sleep mode to normal function mode. When the ignition switch is turned
OFF, 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 receives only those specific signals.
• An ID can be memorized manually or automatically. Each initiator is hardwired to the control unit. Every time the
ignition is turned ON (II), the control unit asks each initiator for a sensor ID. The initiators then transmit the sensor
IDs, and the control unit receives and memorizes them. The control unit then knows which ID belongs to each tire
location. 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 and front initiators: Misalignment of the control
unit and initiators could interfere with sending and receiving signals.
*90
SJC8A00B54175100000EAAT00
−
−
18-60
TPMS
Circuit Diagram
N44
A6
G1
A20
WHT
RED
B1
RR TIRE INDICATOR
LR TIRE INDICATOR
RF TIRE INDICATOR
LF TIRE INDICATOR
GAUGE CONTROL MODULE
LOW TIRE PRESSURE INDICATOR
TPMS INDICATOR
DRIVER
POWER CIRCUIT
YEL
YEL
B8
IG1 HOT in ON (II) and START (III)
IGNITION SWITCH
No.9 (10 A)
RED/WHT
BLK/YEL
WHT
BAT
IG1
No.23 (IG) (50 A)
No.22 (BAT) (120 A)
No.10 (7.5 A)
BATTERY
AUXILIARY
UNDER-HOOD FUSE BOX
DRIVER’S UNDER DASH
FUSE/RELAY BOX
UNDER-HOOD
FUSE/RELAY BOX
F CAN
TRANSCEIVER
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