Classification:

Reference:

Date:

WT19-002

ITB19-018

August 8, 2019

2018 Q50; TPMS LIGHT ON WITH DTC STORED
APPLIED VEHICLES:

2018 Q50 (V37)

IF YOU CONFIRM
The Tire Pressure Monitor System (TPMS) light is ON with one or more of the following DTCs stored:
C1708 – [NO DATA] FL
C1709 – [NO DATA] FR
C1710 – [NO DATA] RR
C1711 – [NO DATA] RL

ACTION
1. Verify that the TPMS sensor associated with the stored DTC(s) is transmitting a signal with the Signal
Tech II.
2. If transmitting, clear TPMS DTCs, turn the HVAC to maximum cool, and then road test the vehicle (see
the specific conditions under steps 20 and 21 on page 6).
3. If a DTC is stored during the road test, replace the HVAC blower motor.

IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you will be performing.
You MUST closely follow the entire SERVICE PROCEDURE as it contains information that is essential to
successfully completing this repair.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that
a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti retailer to determine if this
applies to your vehicle.

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SERVICE PROCEDURE
With the Signal Tech II, check all TPMS sensors for DTCs

1.

Turn the Signal Tech II ON, select TPMS
Check, and then select the vehicle model/year.


After the vehicle is selected, the screen
will prompt you “Press tool against LF tire
and press OK to activate”.

Figure 1

2.

Position the Signal Tech II on the surface of the tire, indicated by the Signal Tech II.


Position where the valve stem is located as shown in Figure 2.
NOTE: Do not hold against the metal wheel, as this can affect the performance of the tool.

3.

With the tool held at a 0 to 15 degree angle to the tire, press and release the OK button to activate the
sensor.


The Signal Tech II will display pressure at this wheel location, and then automatically ask for the
next tire after a successful read.



The Signal Tech II will allow three (3) attempts to successfully read a TPMS sensor before
displaying NO TPM FOUND. An “X” will be displayed along with an audible beep.
IMPORTANT: You will need to hold the tool steady until the test is completed.

Figure 2

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4.

Repeat steps 2 and 3 as the Signal Tech II
prompts you through each wheel position, and
then proceed to step 5.


Once all 4 positions are activated, the
Signal Tech II will scroll to the CON OBD
box shown in Figure 3.

Figure 3
Attach the Signal Tech II to the DLC and check for DTCs

5.

Connect the OBD cable to the base of the
Signal Tech II at the DB15 connection.

6.

Connect the OBD cable to the DLC on the
vehicle and turn the ignition to the ON position.

Figure 4

7.

8.

Once the Signal Tech II is connected, the tool
will display COMMS. Press OK to continue.


The Signal Tech II will connect to the
BCM, read the VIN, sensor IDs and check
for TPMS DTCs.



DTCs related to a specific TPMS sensor
will be displayed.

Press OK on the Signal Tech II.
Figure 5
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9.

When the Signal Tech II displays “IDs
Programmed & DTCs Cleared Successfully”,
press OK to print the audit report.

Figure 6

Print the Signal Tech II File
10.

Connect the USB cable to a PC.

11.

With the tool still on, connect a USB cable to the Signal Tech II.

12.

Open “My Computer” and locate the Signal Tech II at “Removable Disk (x:)”
NOTE: The current vehicle report will be under “Removable Disk x:” with the name CURR_REP.

13.

Click on the reports folder to view saved reports by VIN number.

14.

Locate the file with the vehicle’s VIN.

15.

Double click to open the file.

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16.

Complete the form (Figure 7) and then print it.

17.

Attach a copy of the printed form to the repair order.

XXXXXXXXXXXXXXXXX

Figure 7
18.

Confirm that each TPMS sensor is transmitting a tire pressure.
NOTE: Tire pressures can be found in the second column of the form that was just
printed.

19.



YES, all TPMS sensors are transmitting a pressure: Proceed to step 20.



NO, not all of the TPMS sensors are transmitting a pressure: This bulletin does not apply. Refer
to the ESM for further diagnostic information.

Erase the stored TPMS DTC(s).

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20.

Turn the air conditioning ON and to the following settings:





21.

Maximum cold
Recirculate
Face mode
Maximum fan speed

Drive the vehicle at 25 MPH or more for 3 minutes, and then drive the vehicle at any speed for 10
minutes.


Is DTC C1708, C1709, C1710 or C1711 stored?
YES: Proceed to step 22.
NO: This bulletin does not apply. Refer to the Electronic Service Manual (ESM) for further diagnostic
information.

22.

Replace the HVAC blower with one from the Parts Information section on page 7.


Refer to the ESM for the procedure to replace the HVAC blower:



Refer to the ESM for the procedure to replace the HVAC blower: VENTILATION, HEATER AIR
CONDITIONER > VENTILATION SYSTEM > REMOVAL AND INSTALLATION > BLOWER UNIT BLOWER MOTOR.

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ITB19-018

A.

PARTS INFORMATION
DESCRIPTION

PART NUMBER

QUANTITY

Blower Assembly

27200-4GF1B

1

CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the following claims coding:
DESCRIPTION
TPMS Diagnosis/Blower Motor
(1)
(2)

PFP
(1)

OP CODE
PX87AA

SYM
HC

DIA
32

FRT
2.2 (2)

Reference the electronic parts catalog and use the Front Blower Motor (27200-*****) as the Primary
Failed Part (PFP).
The FRT allows adequate time to access DTC codes. No other diagnostic procedures subsequently
required. Do Not claim any other diagnostic operation codes with this claim.

AMENDMENT HISTORY
PUBLISHED DATE
August 8, 2019

REFERENCE
ITB19-018

DESCRIPTION
Original bulletin published

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ITB19-018