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Infiniti Q45. Manual - part 900

LOW TIRE PRESSURE WARNING SYSTEM

WT-9

System Diagram

NES000CY

COMPONENTS FUNCTION DESCRIPTION

SEIA0741E

Component parts

Function

Low tire pressure warning control unit

Monitors tire pressure and controls the low tire pressure warning lamp and turn signal lamp.

Transmitter

Converts tire pressure signals to radio signals.

Antenna

Receives radio signals converted from tire pressure signals.

Display

Displays the air pressure of each tire.

Tire pressure warning check switch

Allows a mode to be switched to a diagnosis mode.

Hazard warning lamp

ID registration of each wheel has been completed, turn signal lamp flashes two times.

Combination meter

Transmitters the vehicle speed signal to low tire pressure warning control unit.

Low tire pressure warning lamp

Illuminates if malfunction is detected in electrical system of low tire pressure warning system.

WT-10

TROUBLE DIAGNOSIS

PFP:00004

How to Perform Trouble Diagnosis

NES000CZ

BASIC CONCEPT

●

To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con-
trol and mechanism) thoroughly.

●

It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with
customer.

CAUTION:

Customers are not professional. It is dangerous to make an
easy guess like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.

●

It is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
interview with customer and past examples. Do not perform
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with-
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.

●

After completing diagnosis, always erase diagnostic memory.
Refer to

WT-23, "ERASE SELF-DIAGNOSIS"

●

For intermittent malfunctions, move harness or harness connec-
tor by hand. Then check for poor contact or reproduced open circuit.

INTRODUCTION

●

Before troubleshooting, verify customer complaints.

●

If a vehicle malfunction is difficult to reproduce, harnesses, harness connectors or terminals may be mal-
functioning. Hold and shake these parts to make sure they are securely connected.

●

When using a circuit tester to measure voltage or resistance of each circuit, be careful not to damage or
deform connector terminals.

SEF233G

SEF234G