Caterpillar Advanced Ride Management (CARM) Seat Suspension System Caterpillar


Troubleshooting

Usage:

769C 01X
Note: Always brace the suspension mechanism so the seat does not move (up and down) before troubleshooting to prevent injury.

Portions of this material are reprinted with permission from SAE J1939DA_201607© 2016 SAE International. SAE International is not responsible for any use or translation of this material, in whole or in part. Please contact SAE International to obtain a complete copy of SAE J1939DA_201607, the official definitive source of this standard.

Caterpillar Advanced Ride Management (CARM) Seat Suspension Troubleshooting

Table 1
Problem Description  Possible Cause  Recommended Action 
Blue Status Light is Off  No power to the seat  Verify key is in the ON position. 
Bad connection due to loose or disconnected wires Unplug and plug in connectors.

Verify 24 V to the seat at the cab connection. 
Bad fuse in machine Visually inspect fuse and replace as needed. 
Wire damage Visual inspection and/or continuity check based on schematic (attached).

If seat is newer than Serial Number 19041346104 or date 4/23/2013, use ET tool (2013B v1.0 and up) to check fault codes. 
Green Status Light is Off but Blue Status Light is On  Bad connection due to a loose-fitting connector  Unplug and plug in connectors 
Wire damage Visual inspection and/or continuity check based on schematic (included)

If seat is newer than Serial Number 19041346104 or date 4/23/2013, use ET tool (2013B v1.0 and up) to check fault codes 
ECU failure If seat is newer than Serial Number 19041346104 or date 4/23/2013, use ET tool (2013B v1.0 and up) to check fault codes 
Sensor failure If seat is newer than Serial Number 19041346104 or date 4/23/2013, use ET tool (2013B v1.0 and up) to check fault codes 
Shock failure Check temperature sensitive sticker on top of shock to see if the sticker is overheated (black in color). If so, replace the shock 
Seat makes noises:
Squealing 
Excessive wear of components  Replace worn component – Refer to System Operation, RENR2165and Special Instruction, REHS0887 
Missing / dry / misadjusted slider blocks Replace, adjust, or lubricate slider blocks 
Seat makes noises:
Slurping 
Leaky shock  Replace shock 
Seat makes noises:
Clicking / Ratcheting 
Wire damage  Visual inspection and/or continuity check based on schematic (included) 
Seat makes noises:
Hissing 
Air system leak  Identify location of leak and replace component 
Seat will not move up / No compressor noise when the Height/Weight Adjustment knob is pressed  No power to the seat  Verify key is in the ON position

Verify 24 V to the seat at the connection 
No power to the compressor Verify connection at the compressor

Verify continuity of wires to compressor 
No power to the H/W knob Verify connection at the H/W knob

Verify continuity of wires to the H/W knob

Refer to System Operation, RENR2165and Special Instruction, REHS0887 
Seat will not move / Seat is stiff  No power to the seat  Verify key is in the ON position

Verify 24 V to the seat at the connection

See status light description 
Foreign object inside the suspension mechanism is hampering movement Remove foreign object 
Replace or adjust slider blocks  Leaky shock  Replace shock 
Seat feels loose  Loose fasteners  Loose fasteners 
Missing / worn slider blocks Replace or adjust slider blocks 
Seat operation is jerky  Wire damage  Visual inspection and/or continuity check based on schematic (included)

If seat is newer than Serial Number 19041346104 or date 4/23/2013, use ET tool (2013B v1.0 and up) to check fault codes 
Leaky shock Replace shock 
Foreign object inside the suspension mechanism is hampering movement Remove foreign object 

Schematic for ET Jumper Harness

A jumper harness can be created to check fault codes with the ET Tool (2013B v1.0 and up) on certain CARM suspensions. Any suspension built after April 23, 2013 and/or with a serial number later than 19041346104 will be compatible with the ET Tool. The jumper consists of four wires, two connectors, and a resistor. See schematic below



Illustration 1g03710817
(A) Twisted Pair


Illustration 2g03499096

CARM Seat ET Connection (Pre Series K Models)

  1. Connect CAT ET and start connection to the ECM.

  2. You will see the " Attempting to Connect" window open. Click "Stop Connect".

  3. Select WINFLASH. CAT ET will search ATA, CDL then for the J1939 data link.

  4. Now, power up the seat suspension.

  5. The screen will open like you are going to flash the ECM. Now, go to the top left and connect to CAT ET. Wait, CAT ET will hook up!

ET Fault Codes

Note: Using ET Tool (2013B v1.0 and up) and jumper described above

Table 2
Display Pop Up Text - First Line  Display Pop Up Text - Second Line  Expected Fault Code  Possible Secondary Fault Code  Component  Failure Mode Identifier / Description  Warning Level  ECM Action on Fault 
Seat Shock Absorber  Fault  J520705-2    Valve Position Sensor  Data Erratic  Disable Voice Coil / Maximum Damping 
J520707-2   Thermistor  Data Erratic  Disable Voice Coil / Maximum Damping 
J520707-5 J520713-5  Current Below Normal/Open Circuit Disable Voice Coil / Maximum Damping 
520707-6 J520707-2

J521728-15 
Current Above Normal Disable Voice Coil / Maximum Damping 
J520713-5   Voice Coil  Current Below Normal/Open Circuit    None 
J520713-6 J520713-5  Current Above Normal Disable Voice Coil / Maximum Damping 
520716-2   Voice Coil Current Sensor  Data Erratic  Disable Voice Coil / Maximum Damping 
520716-6   Current Above Normal Disable Voice Coil / Maximum Damping 
520721-3 Voice Coil Voltage Sensor  Voltage Above Normal  Disable Voice Coil / Maximum Damping 
J521728-15 Seat Shock Absorber  High Temperature  Reduce Max Voice Coil Current 
Seat Sensor Power Supply  Fault  J520708-3  J520709-2

J521217-21

J520705-2

J521761- 
Sensor Power Supply  Voltage Above Normal  Disable Voice Coil / Maximum Damping 
J520708-6 Current Above Normal Disable Voice Coil / Maximum Damping
Seat Position Sensor  Fault  J520709-2  J520713-5

J521761-31 
Seat Position Sensor  Data Erratic  Disable Voice Coil / Maximum Damping 
Out of Ride Zone  Adjust Seat Height  J521761-31    Out of Ride Zone None 
Seat Air Pressure Sensor  Fault  J521217-21    Seat Air Pressure Sensor  Data Drifted Low  None 
J521217-20 Data Drifted High  None
Seat System Voltage  Fault  521219-3    System Voltage  Voltage Above Normal  None 
Seat Controller  Fault  520457-12    Seat Controller  Bad Device or Component  Disable Voice Coil / Maximum Damping 

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