John Deere 920.06 – BLC, EMU, or ICC: Alarm Output Circuit Fault / Audible Alarm Current High

The control module has detected that the electrical current in the cab warning alarm (buzzer) output circuit is above normal specifications. This condition is almost always caused by a short to ground in the wiring harness or an internal short within the alarm unit itself.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 316GR
• 318G
• 318D
• 320D
• 325
• 328
• 330G
• 331G
• 332G
• 333G
• 319E
• 323E
• 210L EP
• 210K EP
• 5085M
• 5115ML
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R

1. 1

   Locate the Alarm: Find the cab warning alarm (often designated as component H4 in John Deere schematics).

2. 2

   Disconnect Test: With the machine key ON (engine off) and the code active, unplug the electrical connector to the alarm.

3. 3

   Monitor the Code: Check your diagnostic display. If the active code changes from 000920.06 to 000920.05, the wiring is fine, and the alarm itself is internally shorted.

4. 4

   Monitor the Code: If the code remains 000920.06 with the alarm unplugged, the alarm is likely fine, and there is a short to ground in the wiring harness between the control module and the alarm connector.

5. 5

   Harness Inspection: If the code remained active, inspect the wiring harness for chafing, pinched wires (especially where the harness routes near cab mounting points or metal brackets), or melted insulation.

1. 1

   Power Down

   Turn off the machine and disconnect the battery ground cable if you are repairing the wiring harness.

2. 2

   Address the Fault

   If the alarm is faulty: Remove the mounting screws holding the defective warning alarm in the cab panel, install the replacement alarm, and plug in the connector. If the wiring is faulty: Trace the supply wire from the alarm connector back to the control module (e.g., Pin A2 on the EMU or the respective BLC output pin). Repair the shorted section of the wire using OEM-approved heat-shrink butt connectors, and re-loom the harness.

3. 3

   Reassemble and Power Up

   Reconnect the battery and turn the key to the ON position.

4. 4

   Clear Codes

   Navigate to the machine's SERVICE MENU via the cab monitor. Scroll to diagnostics, select the active codes, and clear them. (Note: Active codes will not clear until the underlying short is fixed).

5. 5

   Test

   Trigger a condition that normally sounds the alarm (e.g., unbuckling the seatbelt with the parking brake off, or turning the key on without starting) to verify the buzzer works and the code does not return.