Overview of the Diagnostic Plug
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| Illustration 1 | g01667461 |
View of diagnostic plug | |
The diagnostic plug is a tool that connects to the diagnostic port of the harness for the Electronic Control Module (ECM). Refer to Illustration 1. The plug is used in order to view the status of the Health Interface Module (HIM) or the HIM Low Precision Global Positioning System Option (HIM LP GPS Option) and for troubleshooting.
Note: The diagnostic plug is currently supplied with the server for the Radio Interface Module (RIM).
Description of the Light Emitting Diode (LED)
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| Illustration 2 | g01667462 |
Top view of diagnostic plug | |
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| Illustration 3 | g01674417 |
(1) LED (green) for Vital Information Management System activity (VIMS activity) (2) LED (green) for Compact Measurement Record activity (CMR activity) or Telemetry Pass Through Option activity (TPO activity) (3) LED (green) for Point-to-Point Protocol activity (PPP activity) (4) LED (green) for power in (5) LED (red) for warning | |
There are five LEDs on the diagnostic plug. Refer to Illustration 2 and Illustration 3. When the LED is off, the color of the indicator is a clear gray. When the LED is on, the color of the indicator is green or red. If all of the LEDs are off, then the HIM or the HIM LP GPS Option may not be receiving power. Verify that the power source and the power cables are in order.
| Description of the LED for the Diagnostic Plug | ||
|---|---|---|
| Color | Position | Definition |
| Green | 1 | If the device is currently in control of the service port for VIMS, this LED will remain completely green. This is only applicable to devices that connect to VIMS. |
| Green | 2 | This LED will flash green whenever there is activity on the serial port 2. If GPS corrections are being received by the LP GPS module, or a third party device is receiving telemetry data, then the LED will flash. |
| Green | 3 | This LED will flash green when bytes are read from the telemetry port of VIMS and when bytes are written to the telemetry port of VIMS. |
| Green | 4 | This LED should be solid green. This LED indicates that the unit is receiving power. |
| Red | 5 | The red LED is turned off by the software upon bootup. If this LED is ON or flashing, verify that the keyswitch loopback is inserted in the harness. If the harness is ok, and the LED remains on or the LED is still flashing, attempt to flash the firmware. Refer to Special Instruction, REHS3692, "Procedure to Flash an Electronic Control Module" in order to flash the firmware. If flashing the firmware does not provide resolution, then replace the unit as the hardware has failed. |
Refer to Table 1 for a description of each LED.