InPOWER ITM131 User manual

InPower Model ITM131 Platform Lift Interlock
2006 + Chevy & GMC C4500 & C5500 Chassis
1. Introduction
This product is intended for installation in 2006+ GM (Chevy & GMC) C4500/C5500 chassis with FMVSS
compliant, public use (commercial) platform lifts manufactured by The Braun Corporation, Ricon Corporation
or Maxon Mobility. If another type of lift is to be used, contact the lift manufacturer to determine its
compatibility.
The ITM131 interlock system is designed to meet the requirements of FMVSS 403/404 and therefore must be
installed in accordance with the lift manufacturer’s instructions. The installer must be trained and skilled in
installing FMVSS compliant lift systems. The installation must also comply with SAE (Society of Automotive
Engineers) and GM electrical wiring procedures.
2. Product Description
The ITM131 interlock system consists of a control module, optional remote driver’s LED display, and chassis
interface wiring harness. The control module is a non-microprocessor-based control device. It contains two
connectors for interfacing to the remote LED display and wiring harness. It also contains six diagnostic LED
indicators to aid in system troubleshooting. The “plug and play” GM chassis harness contains one tee-cable
that connect to the parking brake switch and shift lock solenoid that are both located under the dash. A set of
nine 1/4 inch male Faston blade terminals are provided for interface to the platform lift system, door switch,
transmission Park switches, +12 volt power and ground. There is also a door output that can be used to
power an indicator light to show when the lift door is ajar/open. As the C4500 & C5500 chassis are not
factory equipped with a shift lock solenoid a kit is offered by InPower that includes a solenoid and mounting
pin. This kit, or equivalent, is required to meet FMVSS 403/404.
3. Installation Procedures
3.1 Safety Precautions
• Read and understand the instructions in this manual and other manuals before starting the installation.
•
•
•
•
Make sure that the vehicle battery power is disconnected during installation of the Interlock and lift systems.
Reconnect the battery when the system installation is complete.
Wear appropriate safety equipment, such as protective eyeglasses, face shield and clothing when installing
equipment and handling the battery.
Be careful when working near a battery. Make sure that the area is well ventilated and that there are no
flames near the battery. Never lay objects on the battery that can short the terminals together. If battery
acid gets in your eyes, immediately seek first aid. If acid gets on your skin, immediately wash it off with
soap and water.
OWNERS MANUAL
Page
1 of 8
Owners Manual
!
WARNING
This interlock product has been designed and manufactured to meet the intended application
requirements and specifications. Any modifications to the product or to the installation
procedure can be dangerous and will void InPower’s warranty.
Document: OM-66
Date: Sept. 25, 2007
Contents
1. Introduction ......................................................................................................................1
2. Product Description .........................................................................................................1
3. Installation Procedures ....................................................................................................1
4. System and Circuit Diagrams ..........................................................................................2
5. Wiring Instructions ...........................................................................................................5
6. Interlock System Operation..............................................................................................7
7. System Troubleshooting ..................................................................................................7
8. Mechanical Drawings.......................................................................................................8
9. Reference Information .....................................................................................................8
Version Code: C
Date: Dec 29, 2022
ISC N U PRO UT
DO TIN ED DC
ISC N U PRO UT
DO TIN ED DC
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

131 Interlock 6 - 2008
C4500/C5500 chassis , (commercial)
Note that
product technical documents are available on InPower’s web site.
mounting TM131 to the
3.2 Getting Started
This manual provides instructions for installing the InPower Model ITM System in a 200
with a FMVSS compliant public use platform lift. It is important that you
follow these instructions carefully and contact InPower if you need assistance or more information.
This interlock system installation requires additional parts and materials that are not supplied with the interlock
product (See Section 9.2). Identify all required parts before starting the installation and ensure that these
items are the correct type and quality.
Inspect the interlock product and all other components for damage before starting the installation. Do not
perform the installation if any problems exist.
Determine the type of interlock interface required for the platform lift. This interlock system provides a +12 volt
@ 10 amps Lift Enable output to allow the platform lift to be operated. It also requires a Lift Stowed signal
from the lift system that is at ground when the lift is in the fully stowed position. If the lift system is not
compatible with these two interface signals you must take the necessary actions to adapt the lift system
interface to the interlock system’s interface. Refer to the lift manufacturer’s installation instructions for further
details.
The recommended location for the I interlock module is under the dash, left of the
steering column due to the proximity of the wiring connections. The unit must not be located in the engine
compartment or any location that is not protected from the environment.
4. System and Circuit Diagrams
The following pages show the individual circuits that need to be wired. The following section, 5. Installation
Instructions, describes how to wire these circuits.
Page
2 of 8
Owners Manual
Before installing and operating this interlock system, read and understand the lift
manufacturer’s safety, operating and installation instructions.
!
WARNING
Document: OM-66
Date: Sept. 25, 2007
Interlock System Layout
P2
Interlock Control Module
Diagnostic
LED Indicators
Interlock System
TRANS
PARK
PARKING
BRAKE
SHIFT
LOCKED
DOOR
OPEN
LIFT
ENABLE
InPO WER
Remote Driver’s LED Display
36”
Shift Lock
Solenoid Cable
Parking Brake
Switch Cable
18”
18”
Chassis Wiring
Harness CA-ITM131-2
(Center Console Park Brake)
P1
ITM-131
Control Module
J1
J2
DR OUT
ENABLE
+12 v
GND
PK BRK
PARK
SL ON
DR OPEN
STOW
3 2 1
1
3
4
25
6
ENABLE
STOW
PARK 1
DR IN
PARK G
PARK 1
Shift Lock
Solenoid Cable
Parking Brake
Switch Cable
18”
18”
Chassis Wiring
Harness CA-ITM131-4
(Foot Park Brake)
P1
0.25 inch Faston Male Terminals
(9 Total) for Customer Wiring
18”
Pink Blunt-Cut Wire
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
3 of 8
Owners Manual
InPOWER ITM-131
Interlock Module
53 14
21 20
10K
1M
10K
1M
Ground
Park Position Using Range
Position Switch Signals
C4500/C5500
Park 1
Park 1
Ground
Document: OM-66
Date: Sept. 25, 2007
1/4 inch male Faston terminals
6
2Black To GM Shift
Lock Solenoid
+12 V
Dark Blue
Ground
Park Brake Circuit
CIRCUIT 1 - Shift Lock Solenoid Cable
CIRCUIT 2A- Parking Brake Cable - Center Console Brake
Shift Lock Out
Red
Connector located in
driver’s side kick panel.
0 - Released
1 - Applied
1
0
Parking Brake Switch
Park Position Circuit
C4500/C5500
10K
1M
+12 V
Transmission Option Connector (Pin - A)
Allison Transmission
Range Indicator Wire No. 145
Shown in PARK* Position
* Requires reprogramming
by Allison dealer.
Ground when
transmission
is in Park.
CIRCUIT 3B - Park Position
Park G
80-Pin Connector
24-Pin Connector
Yellow Gray
Transmission control module
located under the hood on
passenger side.
GM Harness
C175
CIRCUIT 2B - Parking Brake Cable - Foot Brake
Ground when parking
brake is set.
10K
1M
+12 V
1
4Lt. Blue
Dark Blue
Tee-Cable
Inline
Connector
Harness
0 - Released
1 - Applied
1
0
Parking Brake Switch
Ground when parking
brake is set.
10K
1M
+12 V
1
4
NC
Park Brake Circuit
InPower cable CA-ITM131-2
InPower cable CA-ITM131-2A
InPower cable CA-ITM131-2 or CA-ITM131-2A
P1
J1
Ground
3
10K
1M
Park Position
+12 Volts when
transmission is
in Park.
CIRCUIT 3A - Park Position
Not Used
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
4 of 8
Owners Manual
InPOWER ITM-131
Interlock Module
CIRCUIT 6 - Platform Lift System
Lift Control System
(+12 Volts to allow
operation of platform lift)
Lift Stowed Signal
Ground when lift is
in fully stowed position)
Lift Door Switch In
Enable Lift Out +12V
Ground when door
is open or ajar.
+12 V
10k
1M
+12 Volts @ 8 Amps
+12 V
+12 V
10k
1M Ground when
lift fully stowed.
NOTE - Refer to lift system
documentation for wiring
connections.
Lift Stowed In (Gnd)
Interlock System
J2
36 inches
Remote Driver’s LED Display
InPO WER
TRANS
PARK
PARKING
BRAKE
SHIFT
LOCKED
DOOR
OPEN
LIFT
ENABLE
Ignition +12 Volts (This must be +12 Volts
only when Ignition Switch is on)
Note - This must be properly fused.
Interlock Power Switch (Not supplied with the Interlock system)
ON
OFF
CIRCUIT 5 - Power Switch
+12 Volt Power In
Interlock
System
Ground Ground
Lift Door Open/Ajar
Lift Door Open Out
+12 V
+12 Volts @ 8 Amps
CIRCUIT 4 - Lift Door Switch & Lamp
To chassis ground
(Battery negative)
DR IN
DR OPEN
GND
+12V
ENABLE
STOW
Document: OM-66
Date: Sept. 25, 2007
Open
Closed
Lift Door Switch
P2
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
5 of 8
Owners Manual
5. Wiring Instructions
Circuit 1 - Shift Lock Solenoid Cable (Cable CA-ITM131-2 and CA-ITM131-2A)
1. Install the InPower shift lock solenoid kit per instruction supplied with the kit.
2. Install the GM C4500 & C5500 Wiring Harness supplied with the interlock system. Plug one end into J1
on the interlock control module and the cable with the single connector into the shift lock solenoid as
shown in Circuit Diagram 1.
Circuit 2A Parking Brake Switch Cable - Center Console Park Brake (Cable CA-ITM131-2)
1. Locate the unused parking brake switch connector behind the left front kick panel.
2. Connect the interlock harness with the single wire to the unused connector located in the driver’s-side kick
panel. This white connector has a single blue wire and is connected to the parking brake switch located in
the center of the cab.
3. Refer to Circuit # 2A Diagram and GM document #1017350.
Circuit 2B Parking Brake Switch Cable - Foot Park Brake (Cable CA-ITM131-2A)
1. Locate the Parking Brake Switch terminal that is near the parking brake assembly.
2. Remove the harness plug from the switch terminal.
3. Install the tee-cable supplied with the interlock wiring harness between the parking brake switch terminal
and the harness plug that you removed from the parking brake switch terminal.
3. When complete, the interlock tee-connector will be connected to the GM harness plug and to the parking
brake switch as shown in Circuit #2B Diagram.
Circuit 3A - Park Position
Note - This method requires interfacing to the Allison Range Indicator option connector, and this requires
having an Allison dealer reprogram the transmission to have this output set only in the Park position. (The
normal program is for Park or Neutral.)
1. Install a wire between the interlock PARK G terminal and the Transmission Option Connector Pin-A.
2. Refer to Circuit Diagram # 3A.
Circuit 3B - Park Position
Note - This method requires wiring into the Allison transmission harness to connect to the two range sensor
signals.
1. Determine the best location to splice into the two wires shown in Circuit Diagram # 3B.
2. Install a wire between one of the PARK 1 terminals on the interlock module and the wire running between
the 80-pin Allison TCM connector (Pin-53) and the transmission 24 pin connector (Pin-21 in C175).
3. Install a wire between the other PARK 1 terminal on the interlock module and the wire running between
the 80-pin Allison TCM connector (Pin-14) and the transmission 24 pin connector (Pin-20 in C175).
4. When complete the wiring should be as shown in Circuit #3B).
Circuit 4 Wiring (Lift Door Switch and Light )
1. You will need to install a door switch and wire this switch so that when in the door open position a ground
will be applied to the DR IN terminal on the interlock module.
3. If a door open light is required, wire the light to the DR OUT terminal on the interlock module as shown in
the Circuit #4 Diagram.
!
WARNING
Make sure that the vehicle battery power is disconnected during installation of the Interlock
and lift system. Reconnect the battery when the system installation is complete.
Document: OM-66
Date: Sept. 25, 2007
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
6 of 8
Owners Manual
5. Wiring Instructions (Continued)
Circuit 5 Wiring (Platform Lift)
1. Review the platform lift installation manual and determine how to wire the ITM131 interlock to the
following lift interface connections:
A. Enable Lift - This is an input to the lift system. When at +12 volts, the platform lift can be
operated. Install a wire from the platform lift’s Enable Lift input to the ENABLE terminal on the interlock
module.
Note - The ITM131 will supply a +12 volt @ 10 amp output to allow operation of the lift. Verify
that this is the correct polarity for the platform lift.
B. Lift Stowed - This is an output from the lift system. Verify the polarity of this signal. It should be a
ground signal when the lift in the fully stowed position. Wire it to the STOW terminal on the interlock
Module.
The following diagrams show the wiring interface of typical platform lift systems. Be sure to verify the exact
wiring interface for the lift system that you have.
NOTE - Some lift models have only
Ground, some have +12 V, and others
have both. Check the Braun manual for
details and use the Ground one if available.
Lift Stowed Switch
(Shown in fully
stowed position)
Lift Stowed Switch
(Shown in fully
stowed position)
Ground Terminal
Braun FMVSS Platform Lifts
Ricon Series S Platform Lifts
Com
Enable Lift (At +12 volts to
allow lift to operate)
Enable Lift (At +12 volts to
allow lift to operate)
Maxon Platform Lifts
Lift Stowed (At Ground when
lift is fully stowed)
Enable Lift (At +12 volts to
allow lift to operate)
N.O.
N.C.
7
5
1
2
White/Red Stripe
Maxon Pigtail
J3
Orange
Black
White
J3
6
Ricon Interface Connector/pigtail
Brown
Red
9
Braun Interface Connector
Lift Stowed
(Ground)
Enable Lift
(+12 V)
Lift Stowed
(Ground)
Enable Lift
(+12 V)
Ground
Enable Lift
(+12 V)
Lift Stowed
(Ground)
Circuit 5 Wiring (Interlock System Power Switch)
The installer must supply a two-position On-Off Interlock Power Switch. This switch may be mounted on the
dash at a convenient location.
NOTE - An alternative method is to wire the interlock module power input directly to a +12 volt power source
that is powered by the Ignition Switch, and delete the Interlock Power Switch.
1. Mount the Interlock Power Switch.
2. Wire the “common” side of the Power On/Off switch to a properly fused +12 volt ignition switch
source (powered when the ignition switch is On). Refer to the GM documentation for location of
customer access ignition circuits.
3. Wire the “On” position side of the switch to the +12V terminal on the interlock module.
4. When complete, you should have +12 volt fused power on the interlock module +12V terminal when the
ignition switch is On and the Interlock Power Switch is On.
NOTE - Do not power the interlock system directly from the Battery or any power source that is
not fused and turned off with the ignition switch.
5. Install a wire from a good ground to the GND terminal on the interlock module.
Document: OM-66
Date: Sept. 25, 2007
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
7 of 8
Owners Manual
5. Wiring Instructions (Continued)
Remote Driver’s LED Display
The LED display includes a 36 inch cable that is attached to the underside of the display at one end and contains
a 6-pin connector plug at the other end. Mount the display in a suitable location on the dash (usually to the right of
the steering wheel). Two methods may be used for routing the cable. It may exit the side of the display so that it
can be routed between the dash panel and the steering column. Or, you can drill a hole in the dash so that the
cable can be routed through and behind the dash. Attach the display with the to mounting screws provided, route
the cable to the ITM131 control module, and insert the cable plug into connector J2.
NOTE - Consult GM documentation before drilling to verify the location of all critical components and
harnesses.
6. Interlock System Operation
The interlock system is powered from the Interlock Power Switch and the Ignition Switch when they are both in the
On position. The following is the interlock system sequence of operation:
Step 1 - With the interlock powered on, place the transmission in the Park position.
Step 2 - Set the parking brake.
Step 3 - Open the lift door. When opened, the transmission shift lock will be set to prevent the transmission
from being taken out of Park, and the Lift Enable will be set to allow operation of the platform lift. The
Lift Door Open light, if installed, will operate.
Step 4 - The platform lift may now be operated (Refer to the platform lift operating instructions). Note - During
the Lift Enable sequence, if the parking brake is released the Lift Enable will be deactivated,
preventing lift operation.
Step 5 - When the lift cycle is completed return the lift to its fully stowed position.
Step 6 - Close the lift door.
Step 7 - Release the parking brake. When released, the shift lock will be automatically released.
Step 8 - The cycle is now complete and the vehicle can be taken out of Park and driven.
Notes:
1. The Lift Door Open output (+12 v @ 10 amps) is activated whenever the door is open, independent of
other interlock inputs.
7. System Troubleshooting
If there is a problem with system operation, there is a very high probability that the control module has: A) either
lost its ground or +12 volt power source, or B) that one or more of its inputs are not being actuated by a remote
switch (e.g., Lift Door Switch or Lift Stowed Switch). Most troubles are related to wiring problems, or switches
either failing or becoming out of adjustment.
Troubleshooting Procedure:
Step 1 - Determine if the control module is powered. If the LEDs on the control module are illuminated you have
power. If none are illuminated, check the +12 volt supply on +12V terminal with a voltmeter. Also
check that the module is getting a good ground on the GND terminal.
Step 2 - If the ground and power are correct, first reset the interlock system by turning off its power. Then, step
through the operating sequence as described in Section 6. Interlock System Operation, and note the
status of the green and red LED indicators on the ITM131 control module. Pay particular attention to
the inputs (Green LEDs) such as the lift door switch input and the lift stowed switch input. Verify that
The input status LEDs agree with the switch positions.
The ITM131 interlock module contains six diagnostic LED indicators to aid in system troubleshooting. These
indicators show the status of input and output signals of the ITM131 control module, and are color coded as
follows: Input Signals = Green and Output Signals = Red. These diagnostic indicators are located on the
connector side of the module.
Document: OM-66
Date: Sept. 25, 2007
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC

Page
8 of 8
Owners Manual
7. System Troubleshooting (Cont’d)
PARK
STOW
DR OPEN
PK BRK
LIFT ENABLE
SL ON
System Diagnostic LED Indicators (Located on the Control Module)
(Red) On when the interlock allows the platform lift to operate.
(Green) On when the platform lift is in the fully stowed position.
(Green) On when the park brake is set.
(Green) On when the transmission is in the Park position.
(Red) On when the interlock system is locking the shifter in the park position.
(Green) On when the platform lift door is ajar or open (not fully closed).
8. Mechanical Drawing
All dimensions in inches. Not to scale.
Model ITM131 Control Module
Driver’S LED Display
P2
36”
5.18
4.30
0.450
1.05
ITM-131
Control Module
J1
J2
0.50
1.025
0.1875
2.05
3.50
4.00
9. Reference Information
9.1 Company Contacts
GM Upfitter Integration The Braun Corporation
www.gmupfitter.com 631 West 11th Street
Tel: [phone] Winamac, IN 46966
Fax: [phone] [phone]
[phone]
www.braunlifts.com
Ricon Corporation Maxon Lift Corp.
7900 Nelson Road 11921 Slauson Avenue
Panorama City, CA 91402 Sante Fe Springs, CA 90670
[phone] [phone]
[phone] [phone]
www.riconcorp.com www.maxonlift.com
9.2 Required Parts Not Supplied with ITM131 Interlock
1. Power switch and fuse. See page 3, Circuit 3.
2. Lift Door Open indicator light, if required. See page 3, Circuit 4.
3. Lift Door Closed switch, if not using GM door switch. See page 3, Circuit 4.
4. Miscellaneous wire, mounting hardware, wire tie wraps, wire loom.
Document: OM-66
Date: Sept. 25, 2007
Version Code: C
Date: Dec 29, 2022
InPower LLC
8311 Green Meadows Drive
Lewis Center, Ohio 43035 USA
740-548-0965
www.InPowerLLC.com
© Copyright 2022 InPower LLC