John Deere CAB523640 – CAB: Warning: Lighting System - Hazard

The Cab Control Unit (CAB) has detected a malfunction within the hazard warning light system. While the exact nature of the fault is not specified, it typically indicates an electrical fault such as an open circuit, a short circuit, or an unexpected voltage reading in the hazard light circuit.

• 9450
• 9550
• 9650
• 9650 STS
• 9750 STS
• 9560 STS
• 9660 STS
• 9760 STS
• 9860 STS
• 9540
• 9560
• 9580
• 9640
• 9660
• 9680
• Gator 4X2
• Gator 6X4
• Gator HPX
• Gator XUV
• 5E-5303
• 5E-5403
• 5000 Series
• 670
• 755
• 855
• 955
• 2025R
• 5500N
• C-Series

1. 1

   Verify the fault by accessing the diagnostic trouble codes through the machine's display to confirm CAB 523640 is active, then clear it

2. 2

   Perform a functional check by operating the hazard light switch to see if the code reappears (determines if the fault is current or intermittent)

3. 3

   Visually inspect the hazard lights, including bulbs and lenses, for any visible damage or burnout

4. 4

   Examine the fuse associated with the lighting and hazard light circuits

5. 5

   Inspect wiring and connectors in the hazard light circuit, from the switch to the lights, for loose, corroded, or damaged connections

1. 1

   Replace faulty bulbs

   If any bulbs are found to be burned out during inspection, replace them with the correct type.

2. 2

   Replace blown fuses

   If a fuse is blown, replace it with a new one of the same rating. If the fuse blows again, this indicates a short circuit that requires further investigation.

3. 3

   Repair wiring

   If any damaged or corroded wiring or connectors are found, repair or replace them as necessary.

4. 4

   Test and replace hazard light switch

   If the lights are still not functioning correctly after checking the bulbs, fuses, and wiring, test the hazard light switch for continuity. If the switch is faulty, it will need to be replaced.

5. 5

   Clear fault codes

   After performing repairs, clear the diagnostic trouble codes from the CAB control unit and perform another functional check to ensure the issue is resolved.

6. 6

   Consult a dealer

   If the problem persists after these steps, it may indicate a more complex issue within the Cab Control Unit or the wiring harness, which may require assistance from a John Deere dealer.