Massey Ferguson 1B.02.04 – Linkage/PTO/Light Module: Issue With The LIN BUS Communication Between Linkage/PTO/Light Module On The B-Pillar And The B-Pillar Button Panel

The Local Interconnect Network (LIN) data line has failed to transmit or receive messages between the main B-pillar control module and the physical button panel. This is typically caused by an open circuit, a short to ground, a short to battery voltage on the LIN wire, or an internal failure of the button panel itself.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the wiring harness running inside the B-pillar between the button panel and the main Linkage/PTO/Light module for chafing, pinches, or rodent damage.

2. 2

   Disconnect the plugs at both the button panel and the module to check for pushed-out pins, bent terminals, moisture intrusion, or corrosion.

3. 3

   Using a multimeter, test the LIN bus wire for continuity from end to end, short to ground (FMI 5 condition), and short to battery voltage (FMI 6 condition).

4. 4

   Verify that the B-pillar button panel is receiving its required power and clean ground, as a missing ground will shut down LIN communication.

1. 1

   Power Down

   Turn off the ignition and disconnect the tractor's battery to prevent electrical spikes during module handling.

2. 2

   Access the Components

   Carefully remove the interior plastic trim panels on the right-hand B-pillar to expose the Linkage/PTO/Light Module and the Button Panel.

3. 3

   Harness Repair (If Applicable)

   If the diagnostic checks revealed a broken or shorted LIN wire, repair the wire using appropriate automotive-grade splices and heat shrink, or replace that section of the cab harness.

4. 4

   Component Replacement

   If the wiring tests perfectly, the fault is internal to either the master (Linkage/PTO/Light Module) or the slave (Button Panel). Disconnect and unbolt the faulty button panel, and install the replacement unit.

5. 5

   Reassembly

   Reconnect all harness plugs securely. Reinstall the B-pillar trim panels.

6. 6

   Clear Codes

   Reconnect the battery, turn on the ignition, and use a diagnostic tool (or the tractor's onboard dashboard diagnostic menu) to clear the fault codes. Test the linkage, PTO, and light buttons to ensure functionality and verify the code does not return.