Infiniti Q45. Manual - part 908

TROUBLE DIAGNOSIS FOR SYMPTOMS

WT-41

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2. 

CHECK HARNESS BETWEEN LOW TIRE PRESSURE WARNING CONTROL UNIT AND COMBINA-

TION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter harness connector and low tire pressure warning control unit harness con-
nector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminal 3 and ground.

OK or NG

OK >> GO 

TO 

3.

NG

>> Repair short to ground in harness or connector.

3. 

CHECK LOW TIRE PRESSURE WARNING LAMP

1.

Turn ignition switch “OFF”. 

2.

Connect combination meter harness connector.

3.

Disconnect low tire pressure warning control unit harness connector.

4.

Turn ignition switch “ON”. (Do not start engine.)

Does low tire pressure warning lamps turn ON?

OK

>> GO TO 4.

NG

>> Replace combination meter. Refer to 

DI-24, "Disassembly and Assembly for Combination Meter"

 .

4. 

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT

Check low tire pressure warning control unit input/output signal. Refer to 

WT-17, "Low Tire Pressure Warning

Control Unit Input/Output Signal Reference Values"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Check low tire pressure warning control unit pin terminals for damage or loose connection with

harness connector. If any items are damaged, repair or replace damaged parts.

5. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> Replace low tire pressure warning control unit. Refer to 

WT-49, "Removal and Installation"

 .

Continuity should no exist.

SEIA0751E

WT-42

TROUBLE DIAGNOSIS FOR SYMPTOMS

Low Tire Pressure Warning Lamp Stays ON When Ignition Switch Is Turned ON

NES0007I

DIAGNOSTIC PROCEDURE

1. 

CHECK SYSTEM FOR LOW TIRE PRESSURE WARNING CONTROL UNIT

Perform self-diagnosis. Refer to 

WT-21, "Self-Diagnostic Procedure"

 .

Does the self-diagnostic results indicate any malfunctions?

YES

>> Perform trouble diagnosis. Refer to 

WT-19, "SELF-DIAG RESULT MODE"

 .

NO

>> GO TO 2.

2. 

CHECK POWER SUPPLY

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector.

3.

Check voltage between low tire pressure warning control unit
harness connector (A) terminals and ground.

4.

Turn ignition switch “ON”. (Do not start engine.)

5.

Check voltage between low tire pressure warning control unit
harness connector (A) terminals and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Check the following. If any items are damaged, repair or 

replace damaged parts.

●

10A fuses [No. 1, 6, 21 located in the fuse block (J/B) No.1]. Refer to 

PG-2, "POWER SUPPLY

ROUTING"

 .

●

Harness for short or open between battery and low tire pressure warning control unit harness
connector M84 terminal 1.

●

Harness for short or open between ignition switch and low tire pressure warning control unit
harness connector M84 terminals 2 and 4.

●

Battery and ignition switch. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

Connector

Terminal

Voltage (Approx.)

M84

1 - Ground

Battery voltage

2 - Ground

0 V

4 - Ground

SEIA0746E

Connector

Terminal

Voltage (Approx.)

M84

1 - Ground

Battery voltage

2 - Ground

4 - Ground

SEIA0747E

TROUBLE DIAGNOSIS FOR SYMPTOMS

WT-43

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3. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminals 11.

Also check harness for short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to power in harness or con-

nectors.

4. 

CHECK HARNESS BETWEEN LOW TIRE PRESSURE WARNING CONTROL UNIT AND COMBINA-

TION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter harness connector and low tire pressure warning control unit harness con-
nector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminal 3 and combination meter
harness connector (B) M43 terminal 54.

OK or NG

OK >> GO 

TO 

5.

NG

>> Repair open circuit in harness or connectors.

5. 

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT

Check low tire pressure warning control unit input/output signal. Refer to 

WT-17, "Low Tire Pressure Warning

Control Unit Input/Output Signal Reference Values"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Check low tire pressure warning control unit pin terminals for damage or loose connection with

harness connector. If any items are damaged, repair or replace damaged parts.

6. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> Replace low tire pressure warning control unit. Refer to 

WT-49, "Removal and Installation"

 .

Continuity should exist.

SEIA0748E

Continuity should exist.

SEIA0750E

WT-44

TROUBLE DIAGNOSIS FOR SYMPTOMS

Low Tire Pressure Warning Lamp Blinks When Ignition Switch Is Turned ON

NES0007J

SYMPTOM:

If warning lamp blinks below, the system is normal.

Blink Mode A

●

This mode shows transmitter status is OFF-mode.
Perform transmitter wake up operation. Refer to 

WT-25, "Trans-

mitter Wake Up Operation"

 .

DIAGNOSTIC PROCEDURE

1. 

CHECK TIRE PRESSURE WARNING CHECK SWITCH CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit connector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminal 8 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair short to ground in harness or connector.

2. 

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT

Check low tire pressure warning control unit input/output signal. Refer to 

WT-17, "Low Tire Pressure Warning

Control Unit Input/Output Signal Reference Values"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Check low tire pressure warning control unit pin terminals for damage or loose connection with

harness connector. If any items are damaged, repair or replace damaged parts.

3. 

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> Replace low tire pressure warning control unit. Refer to 

WT-49, "Removal and Installation"

 .

SEIA0347E

Continuity should not exist.

SEIA0752E