John Deere CAB1867 – CAB: Cab Power Module Micro Power (cc# 012) Off When Commanded On

The Cab Control Unit (CAB) attempted to send a 'micro power' signal to the Cab Power Module (CPM) but detected that the power was not successfully activated. This indicates a failure in the communication or power transfer between these two components on the LocalLinkSystem network.

• 9570 STS
• 9670 STS
• 9770 STS
• 9870 STS

1. 1

   Visually inspect wiring harnesses and connectors between the Cab Control Unit (CAB) and the Cab Power Module (CPM) for chafed or broken wires, loose connections, or corrosion.

2. 2

   Check fuses related to the Cab Power Module in the main fuse center, specifically fuses F38, F49, F51, and F57.

3. 3

   Use a multimeter to verify that the Cab Power Module is receiving the correct voltage and has a solid ground connection at the CPM connector.

4. 4

   Cycle the machine's power by turning it completely off, waiting a few minutes, and restarting to clear potential communication glitches.

1. 1

   Monitor signal

   Use a diagnostic tool to monitor the status of the 'Cab Power Module Micro Power' signal while the machine is running to confirm if the signal is not being received by the CPM.

2. 2

   Inspect module connectors

   Carefully remove the connectors from both the Cab Control Unit and the Cab Power Module. Inspect the pins and sockets for any damage or corrosion that may have been missed during the initial visual inspection.

3. 3

   Test or replace modules

   If wiring and connections are good, substitute a known-good test module if available. Otherwise, replace the faulty module. The Cab Power Module is a common point of failure for this issue.

4. 4

   Verify repair

   After replacing a component, clear all diagnostic trouble codes and operate the machine to ensure that the CAB 1867.06 fault does not reappear.