Classification:

Reference:

Date:

ST20-003

ITB20-029

December 22, 2020

2017-2020 Q50; STEERING FEELS LIGHT OR SENSITIVE
APPLIED VEHICLES:

2017-2020 Q50 (V37)

APPLIED SYSTEM:

Steering - Vehicles without Direct Adaptive Steering (DAS)

IF YOU CONFIRM
The client states the steering feels light or sensitive,
AND
There are no EPS DTCs stored.

ACTION
1. Confirm the current power steering control module part number.
2. Reprogram the power steering control module, if applicable.

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
IMPORTANT: Before starting, make sure:



ASIST on the CONSULT PC has been synchronized (updated) to the current date.



All C-III plus software updates (if any) have been installed.
NOTE: The CONSULT PC automatically gets applicable reprogramming data during ASIST
synchronization.



A screen print for warranty documentation can be done from the CONSULT PC during this process
while still connected to the vehicle.



The CONSULT PC is connected to the internet via a cable or Wi-Fi.
 Later in the procedure you will be required to enter your username and password.
 The CONSULT PC must be connected to the Internet.
 If you do not know your username and password, contact your service manager.

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1.

Connect the Vehicle Interface (VI) to the vehicle.

Make sure the VI is securly connected. If the VI connection is loose during reprogramming, the
process will be interrupted and the control module may be damaged.

2.

Connect the AC Adapter to the CONSULT PC.

Be sure to connect the AC Adapter. If the CONSULT PC battery voltage drops during
reprogramming, the process will be interrupted and the control module may be damaged.

3.

Connect a battery maintainer or smart charger set to reflash mode or a similar setting.

To avoid damage to the control module, ensure the vehicle’s battery voltage remains between 12.0V
and 15.5V during reprogramming.

4.

Turn OFF all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range of the CONSULT
PC and the VI.

Make sure to turn OFF all external Bluetooth® devices. If Bluetooth® signal waves are within range of
the CONSULT PC and the VI during reprogramming, reprogramming may be interrupted and the
control module may be damaged.

5.

Turn the ignition ON with the engine OFF.


The engine must not start or run during the reprogramming procedure.

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6.

Turn OFF all vehicle electrical loads such as exterior lights, interior lights, HVAC, blower, rear defogger,
audio, NAVI, seat heater, steering wheel heater, etc.

7.

Turn the hazard warning lamps ON.

8.

Turn ON the CONSULT PC.

9.

Start C-III plus.

10.

Wait for the VI to be recognized.


The serial number will display when the VI is recognized.

VI is
recognized

Figure 1

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11.

Select Diagnosis (All Systems).

Figure 2
12.

Check for DTCs.


If there are any DTCs other than EPS/DAST 3 DTCs; diagnose, perform repairs, and erase DTCs
before continuing.



If no DTCs are stored, continue to step 13 on page 6.

NO DTC

Figure 3

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13.

Return to the home screen, select Home and then Yes.

Figure 4
14.

Select Re/programming, Configuration.

Figure 5

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15.

Use the arrows (if needed) to view and read all precautions.

16.

Check the box confirming the precautions have been read.

17.

Select Next.

Figure 6
18.

If the screen in Figure 7 displays, select Automatic Selection(VIN).


If the screen in Figure 7 does not display, skip to step 19 on page 8.

Example

Figure 7

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19.

Make sure VIN or Chassis # matches the VIN.

20.

If the correct VIN is displayed, select Confirm.

Figure 8
21.

Select Confirm.

Figure 9

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22.

Select EPS/DAST 3.

Figure 10
23.

Select Reprogramming.

Figure 11

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24.

When you get to the screen shown in Figure 12, confirm reprogramming is needed as follows:
a. Find the power steering control module Part Number and write it on the repair order.
HINT: This is the current part number (P/N).

Figure 12
b. Compare the P/N you wrote down to the numbers in the Current Power Steering Control Module
Part Number column in Table A below.


If there is a match, continue to step 25.



If there is not a match, this bulletin does not apply. Return to ASIST for further diagnostic and repair
information.

Table A
MODEL
2017-2020
Q50 (V37)

25.

DRIVETRAIN

Current Power Steering Control Module Part Number: 28504 -

2WD

6HL5A, 6HL6A

AWD

6HL7A

Select Save (Figure 12).

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26.

Use arrows (if needed) to view and real all precautions.

27.

Check the box confirming the precautions have been read.

28.

Select Next.

Figure 13
29.

Read the Current Part Number and the Part Number After Repro/programming. They should be