CLAAS Id7893h / 7893h – EXT (A62) - External Function Module: Right Stop Light Invalid Signal / Communication Failure

The external function module has received no information from the stop lights, or it has received an invalid signal from the right stop light for more than 5 seconds over the CAN bus. The system flags that the right stop light information is not available on the rear 7-pin ISO connector.

• Axion 800
• Axion 810
• Axion 850
• Axion 920
• Axion 950
• Arion 510
• Arion 610
• Arion 630
• Arion 640

1. 1

   Check the CLAAS vehicle CAN bus network to ensure it is communicating properly without excessive frame errors

2. 2

   Check the CAN bus network communication module BDG (A103) to verify that this module is transmitting messages correctly

3. 3

   Check the 7-pin ISO connector by inspecting the physical connector at the rear of the tractor

4. 4

   Check the connectors and continuity of the harnesses linking the EXT (A62) module, the BDG (A103) module, the 7-pin ISO connector, and the right stop light

5. 5

   Check for any short-circuits or open circuits in the lighting and CAN bus wiring

6. 6

   Check the sources of energy, including fuses, power supply, and ground connections for the lighting circuit and the EXT module

1. 1

   Visual Inspection of the ISO Connector

   Inspect the 7-pin ISO connector at the rear of the tractor. Look for dirt, heavy corrosion, or pushed-out pins (specifically the pin assigned to the right stop light). Clean or replace the socket if damaged.

2. 2

   Inspect the Right Stop Light

   Check the right tail light assembly on the tractor. Verify that the stop light bulb or LED is functioning. Replace the bulb if it is blown.

3. 3

   Check Fuses and Relays

   Locate the fuse box and test the fuses responsible for the external lighting, the EXT (A62) module, and the BDG (A103) module.

4. 4

   Wiring Continuity Test

   Using a multimeter, test the wiring harness from the right stop light and the 7-pin ISO connector back to the EXT (A62) module. Repair any broken wires or chafed insulation causing an open or short circuit.

5. 5

   CAN Bus Testing

   If the physical wiring to the lights is intact, test the CAN bus lines between the EXT (A62) and BDG (A103) modules for proper voltage and termination resistance.

6. 6

   Module Replacement/Calibration

   If all wiring, fuses, and bulbs are in working order, the fault lies within the logic boards. Check the compatibility of the program versions and settings. If necessary, replace the EXT (A62) or BDG (A103) module.