REHS8717-02

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Special Instruction
Installation Instruction for Intermittent Wiper Switch for Certain On Highway Truck
{7000}
Media Number -REHS8717-02
Publication Date -2014/05/28
Date Updated -2014/05/28
i05813043
Installation Instruction for Intermittent Wiper Switch for
Certain On Highway Truck{7000}
SMCS - 7000
On Highway Truck:
CT660 (S/N: TRK1-UP; TKL1-UP; TJS1-UP; TGT1-UP; TSW1-UP; TSY1-UP)
Introduction
The purpose of this document is to provide recommended installation instruction for intermittent
wiper switch.
Do not perform any procedure that is outlined in this publication until you understand the information
that is contained in this document.
Note: CAT units built prior to February 2013 were equipped with a three state switch.
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Illustration 1
g03583672
Three state switch
Illustration 2
g03584057
Intermittent switch (1)
This document will aid in the replacement of a three state switch to an intermittent switch.
Safety
Do not operate or work on this machine unless you have read and
understand the instructions and warnings in the Operation and
Maintenance Manuals. Failure to follow the instructions or heed the
warnings could result in injury or death. Contact your Cat dealer for
replacement manuals. Proper care is your responsibility.
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Accidental engine starting can cause injury or death to personnel
working on the equipment.
To avoid accidental engine starting, disconnect the battery cable from
the negative (−) battery terminal. Completely tape all metal surfaces of
the disconnected battery cable end in order to prevent contact with
other metal surfaces which could activate the engine electrical system.
Place a Do Not Operate tag at the Start/Stop switch location to inform
personnel that the equipment is being worked on.
Place the machine on firm ground, lower all implements and release any pressure from the
hydraulic system before starting this procedure.
Required Parts
Table 1
Required Parts
Item
1
Qty
3 (1)
Part Number
Description
358-3424
Fastener
2
2
372-8474
Screw
3
1 (2)
379-1113
Screw
4
1
433-2878
Steering Column Switch
5
1
433-2879
MSM
6
1
-
Harness
(1)
Up to 3 may be needed but are not required.
(2)
This part is not required but may be needed.
Installation Instructions
Verify wiper operation before starting the installation.
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If any of the functions, such as park or washer, do not work, fix the problem before doing the
installation.
The reason to fix is because you will be reusing some of the hardware and wiring. Failure to do this
step can lead to extensive troubleshooting time on the wrong parts.
The installation will require the replacement of the MSM unit, installation of overlay harness,
installation of new switch.
Illustration 3
g03411684
MSM unit (6)
Illustration 4
g03411697
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Overlay harness (7)
Illustration 5
g03411705
New switch (5)
Installation of MSM Unit
The MSM unit is located behind the lower trim panel on passenger side. Remove all the lower trim
panel on the passenger side.
Illustration 6
g03414400
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(A) Trim panels
(B) Right trim panel
Illustration 7
g03414417
(B) Right trim panel
Illustration 8
g03414421
Push tree fasteners (1)
Right side kick panel (B) is fastened with three push tree connectors. Care must be taken not to
damage trim panels in removal. The push trees may be damaged, install new trees if needed.
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Illustration 9
g03414430
(C) Screw
Illustration 10
g03414443
(D) Slot
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Illustration 11
g03414464
(E) Body Clip
Illustration 12
g03583984
(3) Self tapping screw
Lower trim panel under fuse box is held by four screws (C) on top and four body clips (E). Care must
be taken when removing panel. Pull straight out on panel. Lower right body clip may break off. If clip
breaks off, install self tapping screw. Locate screw just to the right of the body clip to avoid slot (D)
in support.
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Illustration 13
g03414650
(F) Mounting bolts for MSM
Illustration 14
g03680962
(5) New MSM
After removing trim panel, remove existing MSM that is located behind the aluminum kick plate.
Remove kick plate, disconnect module, install new module (5). Wait to reinstall kick plate until after
harness has been installed.
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Installation of Overlay Harness
Illustration 15
g03414707
This component is a complete overlay/replacement harness. No wiring will be removed.
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Illustration 16
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g03414748
(G) Wiper connection
(H) MSM wipers
(J) Differential lock connection - not used
(K) Pass through wires
(L) Relays
Start by reviewing the harness.
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Illustration 17
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g03414743
Locate the relays onto the passengers side instrument panel lower support, using self tapping screw.
Illustration 18
g03584018
(AA) Route of pass through wires and MSM wires
Route harness wiper connections through the lower section of center console to driver side. Route
over steering column to left side of column.
Route the pass through wires (AA) and MSM wires to right side over air duct under fuse panel.
CAT Intermittent Wiper Installation Instructions
Table 2
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REF #6
355-3404 CI
CAV
CIR
B/O
1
PLUG
-
2
PLUG
-
3
PLUG
-
4
PLUG
-
5
PLUG
-
6
PLUG
-
7
PLUG
-
8
PLUG
-
9
PLUG
-
10
PLUG
-
11
PLUG
-
12
49C
E
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Illustration 19
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g03414821
(M) MSM 1 connector (gray connector REF # 6)
(N) MSM 2 connector (black connector REF # 5)
Table 3
REF #5
358-6750 C1
CAV
CIR
B/O
1
PLUG
-
2
PLUG
-
3
PLUG
-
4
PLUG
-
5
PLUG
-
6
82Y
B
7
82Z
B
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8
82-0
9
82-1
10
82-2
11
87B
12
PLUG
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-
Illustration 20
g03680836
Install MSM wires into black and white connector on original harness. Do not remove any of the
existing wires. Only one wire will be located in gray MSM #1 connector (M).
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Illustration 21
Illustration 22
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g03583768
g03414990
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Table 4
REF #24
359-3388 CI
CAV
CIR
B/O
A
PLUG
-
B
PLUG
-
C
PLUG
-
D
PLUG
-
E
PLUG
-
F
PLUG
-
G
PLUG
-
H
PLUG
-
I
PLUG
-
J
PLUG
-
K
PLUG
-
L
PLUG
-
M
82C
B
N
82D
B
O
82E
B
P
PLUG
-
O
PLUG
-
R
PLUG
-
S
82F
B
T
PLUG
-
U
PLUG
-
V
PLUG
-
Install the pass through wires in the engine pass through connector. The connector is located upper
right corner of cab behind the aluminum kick panel the MSM is mounted too. The engine connector is
the upper most connector. Remove the wires in cavities M, N, O, & S. Tape terminals off and tape
back onto main harness
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Installation of Intermittent switch
Installation of the switch requires lowering the steering column but not removing the steering column.
There is no need to remove steering wheel.
Illustration 23
g03416202
The center trim panels snap together. Carefully pull the pieces apart. If, unit has trailer brake level
there are three screws in the panels.
Removing Steering Column
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Illustration 24
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g03416209
(P) Bolts
(R) Nuts
Remove the four bolts (P) holding the column to the column bracket. Note routing of harness through
clip. Loosen two of the nuts (R) holding the column bracket to allow column to pull out. Once column
is unbolted and lowered down on the seat, slide the black plastic wire cover down the column. This
action will allow the wiper harness connector to pass through.
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Illustration 25
g03416206
Illustration 26
g03416219
Page 20 of 28
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Illustration 27
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g03416232
Remove switch from column. Note holes that the switch is mounted too on column before removing.
Note the routing of the horn wire.
Illustration 28
g03416222
(S) Two position mount hole
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Install new switch and reverse the process for reassembly. Fully test the unit prior to reassembly of
the column to the dash.
Connect New Switch to harness
The switch will connect to the mating connector on the overlay harness. The overlay harness will
connect to the original harness. This process will be the final connection.
Illustration 29
g03416235
Test the new switch in all signal functions.
KEY OFF TEST
Key off test involves:
• Cycle switch through wiper states with the wiper switch off, key on
• Switch "OFF" crank trunk with the wiper switch off, key off
KEY ON TEST
Key on test involves:
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• Wiper functions
• Washer functions
• Turn signals
• High beam (Make sure that it does not actuate wipers)
• Test switch in multistate activations.
• Head lights "ON" activate switch states
• Turn signal "ON" activate switch states (Make sure that it does not actuate wipers)
• Wipers on request high beam
• Switch "OFF" crank trunk
Reference Electrical Schematics
Wiper Circuit OFF
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Illustration 30
Wiper circuit OFF
Wiper Circuit LOW Speed
Illustration 31
Wiper circuit LOW speed
Wiper Circuit HI Speed
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Illustration 32
Wiper circuit HI speed
Wiper Circuit PARK
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Illustration 33
Wiper circuit PARK
Relay Pin Out
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Illustration 34
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g03642100
Relay label
Table 5
Terminal Number vs Relay Label
Terminal Number
Relay Label
1
30
2
85
3
87A
4
87
5
86
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Illustration 35
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g03583688
Relay pin location - view from wire end
(L1) High speed wiper relay
(L2) Low speed wiper relay
Table 6
Relay Pin Out
Pin
High Speed Relay (L1)
Low Speed Relay (L2)
1
82X
82X
2
82Z "MSM Grnd"
82Y "MSM Grnd"
3
82E "low"
82F "Park"
4
82D "Hi"
82C / 82CD "B+"
5
82CA "B+"
82CB "B+"
Copyright 1993 - 2014 Caterpillar Inc.
All Rights Reserved.
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