ITB14026

Classification:
Reference:
BR14-003
Date:
ITB14-026
June 18, 2014
2014 Q50 HYBRID; BRAKES INTERMITTENTLY GRAB ON INITIAL
APPLICATION AT AMBIENT TEMPERATURES BELOW 40°F
APPLIED VEHICLE:
2014 Q50 Hybrid (V37)
APPLIED VINS AND DATES: Built before:
2WD JN1AV7AP(*)EM 692166 / Apr 16, 2014
AWD JN1AV7AR(*)EM 703481 / Apr 16, 2014
IF YOU CONFIRM
When initially applying the brakes:

The brakes are too sensitive and may unexpectedly grab with a lower than normal pedal pressure.
AND
 Only occurs at ambient temperatures below 40°F (4°C).
NOTE: This Service Procedure will not change or affect any braking sensitivity above 40°F (4°C).
ACTION
1. Bleed the brake hydraulic system.
2. Reprogram the Brake Controller.
3. Erase all DTCs present.
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 the 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 dealer to determine if this
applies to your vehicle.
1/22
SERVICE PROCEDURE
Bleed Hydraulic Brake System
Bleed all four brake calipers first before performing the Brake Controller reprogram.

Refer to the Electronic Service Manual (ESM) section BR Brake System for the procedure to bleed air
from the Hydraulic Brake System.
IMPORTANT: The vehicle ignition must be ON while bleeding the hydraulic system for this
braking system.
Reprogram the Brake Controller
NOTE: Follow all cautions, warnings, and notes in the ESM when working on or near a High Voltage (HV)
System or Supplemental Restraint System (SRS), such as an airbag.
IMPORTANT: Before starting, make sure:

ASIST on the CONSULT PC has been freshly synchronized (updated).

All CONSULT III PLUS (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.

No DTCs stored. Use C-III plus to perform Self Diagnosis for all systems and erase all DTCs.
2/22
ITB14-026
1. Connect the plus VI to the vehicle, and then to the CONSULT PC with the USB cable.
CAUTION: Make sure the plus VI is securely connected. If the plus VI connections are loose during
reprogramming, the process will be interrupted and the Module may be damaged.
2. Connect the AC Adapter to the CONSULT PC.
CAUTION: Be sure to connect the AC Adapter. If the CONSULT PC battery voltage drops during
reprogramming, the process will be interrupted and the Module May be damaged.
3. Connect the GR8 (Multitasking Battery Diagnostic Station) to the vehicles 12V battery.

Set the GR8 to ECM power supply mode.
NOTE: Battery voltage must stay between 12 volts and 15.5 volts or reprogramming may not start or
be temporarily stopped. Returning battery voltage within the 12-15.5V volt range will resume the
reprogramming procedure.
CAUTION: Be sure the GR8 is connected securely to the 12V battery. Make sure the battery voltage
stays between 12.0V and 15.5V during reprogramming. If the battery voltage goes out of this range
during reprogramming, the Module may be damaged.
4. Turn off all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range of the CONSULT PC
and the VI.
CAUTION: 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 Module may be damaged.
3/22
ITB14-026
5. Depress the vehicle’s power (“ignition”) switch twice without depressing the brake pedal.

The meter and gauges will illuminate.
CAUTION: Do Not set the vehicle in “READY to drive” mode or vehicle component damage may occur.
Ready to drive indicator light
(make sure it is OFF)
 Make sure the ready to drive indicator light is OFF (not illuminated).
Figure A
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.
IMPORTANT: Make sure to turn OFF all vehicle electrical loads. Make sure the battery voltage stays
between 12.0V and 15.5V during reprogramming. If the battery voltage goes out of this range during
reprogramming, the Module may be damaged.
7. Turn ON the CONSULT PC.
8. Select CONSULT-III plus (open C-III plus).
NOTE: Make sure all applications other than C-III plus are closed.
4/22
ITB14-026
9. Wait for the plus VI to be recognized.
10. Select Re/programming, Configuration.
9. Plus VI is
recognized
Step
10
Figure 1
11. Use arrows (if needed) to view and read all precautions.
12. Check the box confirming the precautions have been read.
13. Select Next.
Step
11
Step
12
Step
13
Figure 2
5/22
ITB14-026
14. Select Q50 and 2014, or Automatic Selection (VIN).

If Automatic Selection (VIN) is selected, wait for the Reading VIN screen to complete.

If the screen in Figure 3 does not display, skip to step 16.
15. Select Select.
This works,
too
2014
2012
2011
Step
14
Step
15
Figure 3
16. Verify the VIN in VIN or Chassis # matches the vehicle being reprogrammed.

If the correct VIN is displayed, select Confirm.
Verify
here
xxxxxxxxxxxxxxxxx
If OK, select
Confirm
Figure 4
6/22
ITB14-026
17. Wait for system call to complete, and then select Confirm again.
JN1AV7A(*)XEM xxxxxx
Step
17
Figure 5
18. Select BRAKE.
Step
18
Figure 6
7/22
ITB14-026
19. Select Reprogramming.
Step
19
Figure 7
8/22
ITB14-026
20. When you get to the screen shown in Figure 8, confirm this bulletin applies as follows.
a. Find the BRAKE Part Number and write it on the repair order.
NOTE: This is the current BRAKE Part Number (P/N) and will also be needed for claims information.
xxxxxxxxxxxxxxx
20a
Current P/N
-xxxxx
JN1AV7A(*)XEM xxxxxx
If OK, select
Save
Figure 8
b. Compare the P/N you wrote down to the numbers in the CURRENT BRAKE PART NUMBER column
in Table A below.

If the BRAKE part number is one of the part numbers listed in the Table A, continue with
reprogramming.
 Select Save, and then go to the next step.

If the BRAKE part number is not listed in Table A, this bulletin does not apply.
 Disconnect the GR8 and CONSUTLT PC.
Table A
Model year
2014 QX50 (V37)
CURRENT BRAKE PART NUMBER: 460074GF5A, 4GF6B, 4GF6D, 4GF6E
4GF7B, 4GF7D, 4GF7E
4GF8B, 4GF8D, 4GF8E,
4GA8B, 4GA8D, 4GA8E
9/22
ITB14-026
21. Select Next.
xxxxxxxxxxxxxxx
-xxxxx
JN1AV7A(*)XEM xxxxxx
Step
21
Next
Figure 9
22. Use arrows (if needed) to view and read all precautions, then check the box confirming the precautions
have been read.
23. Select Next.
Step
23
Step
22
Figure 10
10/22
ITB14-026
NOTE:
 In some cases, more than one new P/N for reprogramming is available.
 If more than one P/N is available, the screen in Figure 11 will display. Select and use the
reprogramming option that does not have the message “Caution! Use ONLY with NTBXX-XXX”.
 If you get this screen and it is blank (no reprogramming listed), it means there is no reprogramming
available for this vehicle.
BRAKE
Figure 11
24. Read the Current Part Number and Part Number After Reprogramming. They should be different.
25. Select Next.
46007-_ _ _ _ _
46007-_ _ _ _ _
JN1AV7A(*)XEM xxxxxx
BRAKE
Step
25
Figure 12
11/22
ITB14-026
26. Confirm battery voltage is correct, and then select Next.
NOTE: Battery voltage must stay within specified range to make the indicator turn green.
Monitor 12V
battery voltage
here
OK must be
green before
selecting Next
Figure 13
27. With battery voltage in the green, select Start.

The reprogramming process begins when Start has been selected.
NOTE: For reprogramming to continue, vehicle 12V battery voltage must stay
within 12 volts and 15.5 volts. Make sure the voltage level is sufficient.
Monitor 12V
battery voltage
here
Step
27
Figure 14
12/22
ITB14-026
28. Wait for both bar graphs to complete.
Figure 15
29. When the screen in Figure 16 displays, reprogramming is complete.
a. Select Next, and then wait for System Call to complete.
b. Proceed to step 30 on page 15.
Step
29a
Figure 16
NOTE: If the reprogram will not complete, refer to the next page for “recovery” information.
13/22
ITB14-026
BRAKE MODULE recovery
NOTE: If reprogramming does not complete and the !? displays as shown in Figure 17:

Check battery voltage (12.0 - 15.5V).


Ignition is ON, Ready Mode is OFF.
External Bluetooth® devices are OFF.


All electrical loads are OFF.
Select Retry and follow the on
screen instructions.

46007-_xxxxx _
46007-_xxxxx _
Retry may not go through on the first
attempt and can be selected more
than once.
INFINITI Q50 Hybrid HV37
xxxxxxxxxxxxxxxxx
BRAKE
Figure 17
OR: If reprogramming does not complete and the X displays as shown in Figure 18:
Do not disconnect plus VI or shut
down Consult III plus if
reprogramming does not complete.

Check battery voltage (12.0 - 15.5V).


CONSULT A/C adapter is plugged in.
Ignition is ON, Ready Mode is OFF.


Transmission in Park.
All C-III plus / plus VI cables are
securely connected.
All C-III plus updates are installed.


46007-_xxxxx _
46007-_xxxxx _
INFINITI Q50 Hybrid HV37
xxxxxxxxxxxxxxx
BRAKE
Select Home, and then restart the
reprogram procedure from the
beginning.
Figure 18
14/22
ITB14-026
30. Erase all DTCs as follows:
a. Turn the “ignition” off by depressing the power switch once.

The screen in Figure 19 will read OFF after pressing the power switch once.
Turn ignition switch OFF position
ON to
OFF
Figure 19
b. Wait 1 minute with the ignition OFF.
c. Turn the “ignition” ON by depressing the power switch twice (not Ready mode).

Do not step on the brake pedal when depressing the power switch.

The screen in Figure 20 will read ON after pressing the power switch twice.
OFF to
ON
OFF
Figure 20
15/22
ITB14-026
d. Wait for the ERASE function to complete.
Figure 21
31. Verify the before and after part numbers are different.
32. Print a copy of this screen (Figure 22) and attach it to the repair order.
33. Select Confirm.
Step
31
292C0-XXXXX
292C0-XXXXX
JN1AV7A(*)XEM xxxxxx
Step
32
Step
33
Figure 22
16/22
ITB14-026
34. Select Home.
Step
35
Step
34
Figure 23
35. Close C-III plus by selecting “X” (see Figure 23).
 Do not turn off the CONSULT PC.
36. Turn the ignition OFF.
37. Disconnect the GR8 from the 12V battery.
38. Open C-III plus.
17/22
ITB14-026
39. Once the plus VI is recognized, select Diagnosis (All Systems).
Plus VI
recognized
Step
39
Figure 25
40. Select Q50 and 2014, or Automatic Selection (VIN).

If Automatic Selection (VIN) is selected, wait for the Reading VIN screen to complete.

If the screen in Figure 26 does not display, skip to step 42.
41. Select Select or Detect Vehicle, whichever displays.
This works, too
2014
2012
2011
Step
40
Step 41: May display
Detect Vehicle
Figure 26
18/22
ITB14-026
42. Verify the VIN in VIN or Chassis # matches that of the vehicle.

If the VIN is correct, select Confirm.
Verify
here
xxxxxxxxxxxxxxxxx
If OK, select
Confirm
Figure 27
43. Wait for System Call to complete.
Figure 28
19/22
ITB14-026
Erase all DTCs present
44. Once the screen in Figure 29 appears:
a. Do not select ERASE until the Step 47.
b. Turn the ignition OFF.
c. Close CIII plus application.
d. Disconnect the CIII plus VI.
e. Wait for at least 5 minutes.
IMPORTANT:
 If the VI is not disconnected in “step e”,
DTCs will not clear.

If the ignition is not left OFF for 5
minutes the DTCs will not clear.
Figure 29
45. After 5 minutes depress the vehicle’s power
(“ignition”) switch twice without depressing the brake
pedal to turn ignition ON:
a. Re-connect the CIII plus VI.
b. Start CIII plus.
c. Check DTCs.
NOTE: Some, but not all should go to past as
shown in Figure 30.
d. After checking DTCs turn ignition OFF
NOTE: This can be done immediately after
DTCs are checked.
Figure 30
46. Wait 1 minute and then:
a. Place the vehicle in “READY to drive” mode as
follows:
1.
2.
3.
4.
Apply the parking brake.
Depress the brake pedal.
Depress the power switch once.
Make sure the “Ready” light is ON.
b. While in “READY to drive” mode depress brake
pedal for at least 5 seconds (all DTCs as shown
in Figure 31 should now be PAST).
Figure 31
20/22
ITB14-026
47. Select ERASE.
Figure 32
Step
47
48. Once all DTCs have been cleared turn “ignition” off (depress power switch once).
49. Select Home, and then on the next screen select Yes (screen not shown).
50. Close C-III plus, turn off the CONSULT PC, and then disconnect the CONSULT PC and plus VI from the
vehicle.
51. Verify no additional error messages are displayed in the meter and gauges or center multi-function control
panel.
21/22
ITB14-026
CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the following claims coding:
OPERATION
OP CODE
PFP
SYM DIAG FRT
E-ACT REPROGRAMMING & BRAKE SYSTEM AIR
PX72AA
(1)
DC
32
1.0
BLEED ALL
(1) Refer to the electronic parts catalog (FAST) and use the Brake Controller assembly part number
(46007-*****) as the Primary Failed Part (PFP).
22/22
ITB14-026