Using The Cdm To Retrieve Data From The Onboard Computer - Club Car 2009-20011 Electric Precedent Maintenance And Service Manual

EXCEL SYSTEM TROUBLESHOOTING – MCOR
in the window. See Figure 14-21, Page 14-38 for CDM features. Releasing the button when the desired code is
displayed will display the data. Function codes and corresponding data are as follows:
• F1 – Battery voltage:
• This displays the battery pack's current state of charge. A reading of less than 48 volts indicates that the batteries
need to be charged. If a reading of less than 48 volts is obtained immediately after a charge cycle, there may be
a problem in the charge circuit.
• F2 – Energy units removed since last charge cycle:
• If the display reads over 75 (the vehicle battery warning light should be illuminated), the vehicle batteries need
to be recharged before being used again. This data can be used to make sure all vehicles in a fleet receive
equal usage on a short-term basis.
• F3 – Total accumulated energy units removed since initial vehicle start-up:
• This information is most useful in making sure that all vehicles in a fleet receive equal usage over long periods
of time.
• F4 – Last charge termination type (1 = incomplete, 2 = DVDT, 4 = normal, 8 = max. timer):
• A 1, 2, 4, or 8 will be displayed.
• 1 – Indicates the last charge cycle was incomplete and the batteries were not fully charged. Batteries should be
charged again at the earliest opportunity.
• 2 – Indicates a back-up charge program was employed by the OBC to complete the charge cycle if a normal charge
(4) is not possible. DVDT refers to an increase in voltage within a time period. The OBC monitors battery voltage
during charging and will terminate the charge when the voltage does not increase within the time period. A DVDT
charge may be displayed the first few times a new set of batteries is charged, and the first time a set of batteries is
charged after the batteries have been disconnected and reconnected. A problem may exist if persistent DVDT
readings are obtained.
• 4 – Indicates the last charge cycle was normal.
• 8 – Indicates the charger ran for sixteen hours and shut itself off without completing the charge cycle. This means
there may be a problem in the charge circuit.
The CDM also has a low battery indicator, which illuminates when CDM batteries are weak and need to be replaced.
Weak batteries in the CDM may cause the CDM to register inaccurate information or no information.

USING THE CDM TO RETRIEVE DATA FROM THE ONBOARD COMPUTER

1. Turn the CDM ON.
2. Position CDM on seat bottom so it is aligned directly with the battery warning light. Ensure CDM infrared LED
receiver is pointed at battery warning light and there is a clear path between them. See following NOTE.
NOTE: If, by positioning CDM on seat bottom, the CDM is unable to collect the data stream from the onboard
computer, hold CDM approximately 6 inches (15.2 cm) from battery warning light.
3. Wait approximately 30 seconds for a value to appear in the display window.
4. If a value does not appear in the display window after 30 seconds, try adjusting the aim of the CDM and repeating
step 3 until a value appears. If there is still no reading, check for weak batteries in the CDM.
4.1. Adjust aim of CDM.
4.2. Drive vehicle a short distance to ensure OBC is not in powerdown mode.
4.3. Check for weak batteries in CDM.
2009-2011 Electric Precedent Maintenance and Service Manual
Communication Display Module (CDM)
14
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