SERVICE BULLETIN
SB2345
ADDRESSEES

: Owners and operators of coaches listed under “Application”
ABC Customer Care and Parts Source

VEHICLE MODEL

: TD925

SYSTEM/SUBSYSTEM

: 10.66 Body and accessories – Interior lighting equipment

BULLETIN TYPE

: Service information

DATE

: September 27th, 2023

SUBJECT

: Step nose lighting

TERMS & CONDITIONS

: This service bulletin does not entitle to any reimbursement.

APPLICATION:
This service information bulletin is applicable to TD925 coaches with step nose lighting.

INTRODUCTION:
Two different types of step nose lighting units have been installed during manufacturing.
 The early units (which are limited available as spare part) are provided with a LED card for the
“downward” light and an optical fiber for the “upward” light. These units have a small circuit
board with a resistor to reduce the 24V power supply to an operating voltage of 3V for the
optical fiber (refer also to figure 1).
 The new units have an optical fiber for both the “downward” and “upward” light, and do not have
a circuit board to reduce the voltage supply. These lighting units may not be connected
directly to a 24V power supply but must be used together with special controllers. Failure
to do will cause the immediate irreversible breakdown of the lighting unit due to
overvoltage! Please also note that the “downward” light on new units is less bright.
This service bulletin provides you with information on how the new step nose lighting units are
connected to the vehicle wiring.

LED card as
“downward”
lighting

Circuit board
with resistor
for “upward”
lighting

Figure 1: Identification of early step nose lighting unit

Continued on next page.
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STRUCTURE OF STEP NOSE LIGHTING:

FRONT STAIRS
Figure 2A: Step nose lighting on front stairs

REAR STAIRS

Figure 2B: Step nose lighting on rear stairs

MATERIAL FOR FRONT STAIRS:
VH reference
11241232
11241243
11193132
11432868
11432859
11232686

Description
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit

Number in figure 2A
1
2
3
4
5
6

Qty
1
1
1
1
1
2

11382450
11382452
10988784
10988783
11134561
11135287
11135288

Controller, POWERLED (6-pin/12-pin connector plugs)
Controller, RGB (6-pin/21-pin connector plugs)
Connector socket, 6-pin, blue
Connector socket, 12-pin, green
Connector socket, 21-pin, brown
Connector terminal, female (0.5-1 mm2)
Connector terminal, female (1.5-2.5 mm2)

7
8
-

2
1
3
2
1
20
14

10704221
660768502
660768501
660766313
660766300
660766406
660766405

Floating diode
Connector plug, 1-pin, white
Connector socket, 1-pin, white
Connector terminal, male (0.75-1.5 mm2)
Connector terminal, female (0.75-1.5 mm2)
Connector terminal, male (4-6 mm2)
Connector terminal, female (4-6 mm2)

-

2
2
2
2
2
2
2

-

#
#

11357365
Cleaner
11357370-03500 Adhesive tape




The numbers listed under “Qty” are for a “full” installation
Material may be purchased through regular channels.
Parts/Waste disposal: discard old material according to applicable environmental regulations.
Continued on next page.
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MATERIAL FOR REAR STAIRS:
VH reference
11241253
11251661
11234048
11295309
11285569
11233882
11232686

Description
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit
Step nose lighting unit

Number in figure 2B
1
2
3
4
5
6
7

Qty
1
1
1
1
1
1
1

11382450
11382452
10988784
10988783
11134561
10988794
11135288

Controller, POWERLED (6-pin/12-pin connector plugs)
Controller, RGB (6-pin/21-pin connector plugs)
Connector socket, 6-pin, blue
Connector socket, 12-pin, green
Connector socket, 21-pin, brown
Connector terminal, female (0.5-1 mm2)
Connector terminal, female (1.5-2.5 mm2)

8
9
-

1
1
2
1
1
16
14

10704221
660768502
660768501
660766313
660766300
660766406
660766405

Floating diode
Connector plug, 1-pin, white
Connector socket, 1-pin, white
Connector terminal, male (0.75-1.5 mm2)
Connector terminal, female (0.75-1.5 mm2)
Connector terminal, male (4-6 mm2)
Connector terminal, female (4-6 mm2)

-

2
2
2
2
2
2
2

-

#
#

11357365
Cleaner
11357370-03500 Adhesive tape




The numbers listed under “Qty” are for a “full” installation.
Material may be purchased through regular channels.
Parts/Waste disposal: discard old material according to applicable environmental regulations.

JOB REQUIREMENTS:
1. Technician’s expertise and job supporting information:
This job has to be carried out by an experienced automotive electrician.
2. Special tools, equipment or services:
This job requires the use of an appropriate terminal crimping tool and soldering equipment.

PREPARATIONS:




Park the coach safely, apply the parking brake, stop the engine, switch off all systems and turn
off the battery master switch.
Install a “DO NOT OPERATE” warning message on the instrument panel.
Read the entire procedure before beginning to work.

WARNING!
Observe safe shop practices at all times.
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PROCEDURE:
Step
1
2
3
4

Action
Remove the defective nose lighting unit as explained in “STEP 1 IN DETAIL”.
Install the new nose lighting unit as explained in “STEP 2 IN DETAIL”.
Verify the operation of the step nose lighting system.
Replace the access panel.

STEP 1 IN DETAIL: To remove a defective step nose lighting unit
Step
1.1




Action
On the front stairs: remove the access panel of the compartment located in
the first step (refer to figure 2A) to gain access to the controllers.
On the rear stairs: remove the access panel of the compartment located in
the fifth step (refer to figure 2B) to gain access to the controllers.

Figure 3: Location of step nose
lighting controllers in first step
compartment of front stairs
(example)

1.2
1.3
1.4

Cut the cable ties securing the extension cable.
Remove the step nose lighting unit fixing screws and carefully pull loose the with
adhesive tape mounted defective unit.
Cut-off the wires of the extension cable near the soldering joints under the step
nose lighting unit.

STEP 2 IN DETAIL: To install a new step nose lighting unit
Step
2.1
2.2

Action
Thoroughly clean the step nose using cleaner 11357365 or similar product.
Solder the wires of the new lighting unit to the extension cable as indicated in
table 1. Provide a durable and watertight connection.
Table 1: To connect extension cable to step nose lighting unit
Extension cable
White (W)
Black (Z)
Brown (BR)
Blue (B)
Yellow-green (GE-GN)
Gray (GS)

Wire at lighting unit
White (- POWERLED)
Brown (+ POWERLED)
White (RGB GROUND)
Yellow (RGB BLUE)
Green (RGB GREEN)
Brown (RGB RED)

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2.3

Install the new step nose lighting unit with adhesive tape and secure with fixing
screws.

HOW TO CONNECT CONTROLLERS TO VEHICLE HARNESS?




Figure 8 shows the wiring harness of the step nose lighting at the front stairs. The wiring
harness is connected in such a way that the “upward” light of all step noses illuminates “red”
and the “downward” light illuminates “white” when the front door is open. If the front door is
closed, only the upper step nose will illuminate: “upward” light illuminates “blue”, downward”
light illuminates “white”.
Figure 9 shows the wiring harness of the step nose lighting at the rear stairs. The wiring
harness is connected in such a way that the “upward” light of all step noses illuminates “red”
and the “downward” light illuminates “white” when the rear door is open. If the rear door is
closed, the “upward” light of the three upper steps illuminates “blue” and the downward” light of
all steps illuminates “white”.

NOTE: You can choose another color for the “upward” light by connecting another (that the gray
wire) of the extension cable to the “RGB” controller. For green light, connect the yellow-green (GEGN) wire to the “RGB” controller. For blue light, the “blue” wire. For yellow light, the yellow-green
(GE-GN) and the gray (GS) wires.
Table 2: Output 21-pin connector plug on RGB controller

Figure 4
Pin
1, 2, 3, 5, 6
4, 10, 16
7, 13, 17
8, 14, 19
9, 15, 20
12, 18, 21

Function
Common ground
Output group 1
Output group 2
Output group 3
Output group 4
Output group 5 (18 = flashing light!)

Table 3: Output 12-pin connector plug on POWERLED controller

Figure 5
Pin
1, 3, 5, 7, 9
2, 4, 6, 8, 10

Function
Power supply (+)
Ground

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Table 4: Input 6-pin connector plug on RGB controller

Figure 6
Pin
1
2
4
3, 5, 6

Function
24V power supply for outputs 16, 17, 19, 20, 21
24V power supply for outputs 10, 13, 14, 15, 18
24V power supply for outputs 4, 7, 8, 9, 12
Ground

Table 5: Input 6-pin connector plug on POWERLED controller

Figure 7
Pin
1, 2, 3
4, 5, 6

Function
+24V power supply
Ground

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FRONT STAIRS

Figure 8: Wiring diagram of step nose lighting at front stairs

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REAR STAIRS

Figure 9: Wiring diagram of step nose lighting at rear stairs

Continued on next page.
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DISCLAIMER:
The procedures contained herein are not exclusive. Van Hool cannot possibly know, evaluate, or
advise the transportation industry of all conceivable ways in which a procedure may be undertaken
or of the possible consequences of each such procedure. Other procedures may be as good, or
better, depending upon the particular circumstances involved.
Each carrier who uses the procedures herein must first satisfy itself thoroughly that neither the
safety of its employees or agents, nor the safety or usefulness of any products, will be jeopardized
by any procedure selected.

INFORMATION HANDLING:
Important supplements to and modifications of the technical information not yet included in the Van
Hool manuals are communicated by means of Service Bulletins.
File the Service Bulletins at the back of your manual, in numerical order.
To make sure that you will be reminded of the Bulletins that have appeared in the meantime while
paging the manual, mark the pages concerned by hand with the Service Bulletin number.

VAN HOOL CUSTOMER PORTAL:
Consult the Van Hool customer portal for the latest service documentation. Beside the
maintenance manual, you will also find the operating manual and the spare parts catalogue of your
vehicle on the customer portal. The customer portal is accessible through www.vanhool.be, under
menu point “Service” and only with a code (password) from Van Hool. If you do not have a
password yet, request it by using the link on the Van Hool website.

SB2345_USA_en_2023-09-27

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