SB-10057546-6365

Special Bulletin

Revision G

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

1(18)

This document supersedes previous revisions.
Addition of a new operation to be performed. The AFSS extinguisher bottle support must be
removed and replaced with new reinforced support #406708.

AFSS UPDATE - LTD REPLACEMENT AND RELOCATION OF IR SENSOR
Prevost vehicles
DESCRIPTION
On the vehicles affected by this bulletin, replace and relocate the LTD. Remove the existing IR sensor and
install an updated IR sensor. Finally, remove and replace the extinguisher bottle support.

MODEL YEAR(S) AND VEHICLES INVOLVED
NOTICE TO SERVICE CENTERS
Verify vehicle eligibility by checking warranty bulletin status with SAP or via ONLINE WARRANTY
SYSTEM available on Service / Warranty tab of Prevost website.

Model
X3-45 Commuter
Model Year : 2012

VIN
From 2PCG33495CC735053 up to 2PCG33495CC735232 incl.

This bulletin does not necessarily apply to all the above-mentioned vehicles, some vehicles may have been modified before delivery. The
owners of the vehicles affected by this bulletin will be advised by a letter indicating the Vehicle Identification Number (VIN) of each
vehicle concerned.

MATERIAL NEEDED
Order kit “SP14-21” which includes the following parts:
Part No.

Description

Qty

069020

HARNESS, INTERFACE

1

069041

LTD (Linear Thermal Detector)

1

406701

SUPPORT, IR SENSOR

1

563457

SENSOR, INFRARED

1

500321

WASHER, BEL SPR .331x.827x.098 ZG603

1

502851

NUT, HEX M8-1.25 ZG603

1

5001742

SCREW, CAP HEXF M8-1.25x30 G8.8 ZG603

1

561565

SEAL 20-18 g

2

561578

TERMINAL, SOCKET 16-14 g

1

561689

TERMINAL, SOCKET 20-18 g

2

561782

CONNECTOR, SOCKET HOUSING PED WEATHER PACK

1

561786

SEAL 16-14 g

1

Special Bulletin

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

2(18)

563588

TERMINAL, PIN

2

563589

CONNECTOR, SOCKET HOUSING DTM 06-2S

1

563590

CONNECTOR, PIN HOUSING DTM 04-2P PH 2C

1

563604

LOCK, SECONDARY

1

563606

PLUG, SEALING

2

5001017

SCREW, THREAD CUTTING HEXW #10-24x1/2

6

504013

TIE MOUNT, ¼ x ¼

6

507664

CABLE TIE, NYLON 3/16" x 11" DOUBLE LOOP HEAD

18

504637

CABLE TIE, NYLON 3/16" x 13"

20

502841

NUT, HEX NYRT M5-0.8 ZG603

2

5001146

SCREW, CAP HEX M5-0.8x20 SS EMN

2

Additional parts required:
Part No.

Description

Qty

406708

SUPPORT, AFSS EXTINGUISHER BOTTLE

1

509491

NYLON TIE, CABLE

1

NOTE
Material can be obtained through regular channels.

NOTE
The Linear Thermal Detector (LTD) is a twin conductor cable with temperature-sensitive insulation
protected by a red outer sheath. It operates by short-circuiting in a fire or overheat condition. The
cable cannot be reset; if the wire alarms to a fire, the wire must be replaced or the damaged section cut
out and a new section added prior to returning the system to service.

Special Bulletin

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

3(18)

LTD INSTALLATION GUIDELINES
IMPORTANT: WHEN INSTALLING THE “LTD”, THE FOLLOWING GUIDELINES MUST BE FOLLOWED.

NOTE

Always use double loop cable ties to secure LTD. LTD must be tied alone, with no
other cables in the loop.
NOT ALLOWED
CORRECT

Possible contact or rubbing against
screws, edges, etc.

LTD must be routed clear of screws, sharp
edges, etc.

NOT ALLOWED

CORRECT

Rubbing or possible rubbing against abrasive
surfaces

LTD must be secured with double loop cable
ties. Distance between cable ties must not
exceed 4 inches (100mm) max

NOT ALLOWED

LTD touching cut cable tie

Special Bulletin

NOT ALLOWED

LTD extending slantingly from the
cable tie

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

4(18)

CORRECT

LTD is not a flexible harness. Avoid tight
bends and kinks which could short circuit the
LTD. Loops must hace a minimum radii of 4
inches (100 mm)

NOT ALLOWED

CORRECT

Cable tie tighten in excess on the LTD.
Tighten cable tie on LTD by hand only.
Tighten just enough to prevent LTD from
slipping from once side to the other inside
the cable tie loop

Proper tightening of the cable tie on the LTD

Special Bulletin

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

5(18)

PROCEDURE

DANGER
Park vehicle safely, apply parking brake, stop engine. In the battery box, set the battery cut-off switch
to the OFF position prior to working on the vehicle.
1)

With the battery master switch to the ON position and the ignition switch to the ON position, check
that there are no trouble conditions on the AFSS system. Check that the driver’s area AFSS
protection panel SYSTEM OK green lamp is illuminating. If it is not illuminating, then the TROUBLE
lamp should blink or illuminate steady. You must troubleshoot and correct that situation prior
proceeding to this bulletin.

2)

Disconnect the extinguisher bottle connector. Plug the “Kidde Valve Simulator” p/n 420871-98
(Prevost #685128).
The Valve Simulator is used to simulate the squib and discharging of an extinguisher. It plugs into
the wiring harness of the extinguishing circuit and provides an audible warning (chirp) when a signal
is received from the control panel to discharge the extinguisher.
Failure to do so may result in extinguisher discharge at time of resetting the system if the LTD is
short circuited due to improper manipulations and/or faulty installation.

FIGURE 1

FIGURE 2

3)

Turn the ignition switch to the OFF position. Set the battery master switch to the OFF position.

4)

Inside the front electrical compartment, pull fuse F45 to cut electrical supply to the
AFSS protection panel. You will find F45 in an inline blade-type fuse holder among
nearby harnesses (see figure 3).

Special Bulletin

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

6(18)

FIGURE 3: FUSE F45 INSIDE FRONT ELECTRICAL COMPARTMENT

5)

To ease access to the engine, remove the rectangular access hatch located under the rear cross
seats (figure 4).

6)

Remove the trapezoidal access hatch located at the rear of the passengers’ area (figure 5).

FIGURE 4

FIGURE 6: REMOVE SPLASH GUARD SHOWN

FIGURE 5

FIGURE 7: REMOVE SPLASH GUARD SHOWN

7)

Remove the splash guard shown on figure 6. To do so, unscrew one nut (use 10mm socket).

8)

Remove the other splash guard (figure 7). To do so, remove 4 screws (use 10mm socket).

Special Bulletin

SP14-21G
Date

Expiration

Release

Page

04.2014

04.2016

7

7(18)

REMOVAL OF EXISTING IR SENSOR SUPPORT, POWER CABLES AND LTD
9)

Locate the IR sensor and support above the turbo (figure 8).

FIGURE 8: IDENTIFICATION OF COMPONENTS AND HARNESSES

FIGURE 9

10)

Remove the bolts from the engine compartment light and bracket (see figure 9, step A).

11)

Remove the bolts from the IR sensor support (see figure 9, step B).

12)

Starting from the IR sensor support, cut all nylon cable ties securing the LTD (cable with red
sheath). On the engine hot side, the LTD is routed under the starter and forms a loop and then
comes back and runs to the cold side of the engine (figure 10). On the cold side, the LTD is routed
as shown on figure 11. Keep the end of line device (EOL) found at the end of the LTD for reused.