ELECTRICAL SYSTEM AND TESTING: ELECTRIC
VEHICLES
Communication Display Module (CDM)
22
A 0, 1
,
2
,
4
, or
8
will be displayed.
0 --
Indicates that no charge history has been recorded by the OBC.
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. 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.
4.4. If reading is still not obtained, go to the CDM Troubleshooting Guide on page 22-38.
Once a value has been obtained in the display window, the CDM may be removed from its receiving position and
the data reviewed. The CDM will hold the values for F1, F2, F3, and F4 until the CDM is turned OFF or it receives
another line of data from the same or another onboard computer. Use the following procedure to review the data
stored in the CDM:
• The value currently displayed will be F1 (battery voltage).
See following NOTE.
• To view F2, press and hold the button on the CDM. When “Func 2” appears in the display window, release the
button. The value for F2 will then be displayed.
• To view F3, press and hold the button on the CDM until “Func 3” appears in the display window. Release the
button. The value for F3 will be displayed.
• To view F4, press and hold the button on the CDM until “Func 4” appears in the display window. Release the
button. The value for F4 will be displayed.
NOTE:
The values of all four functions can be recalled by pressing and releasing the CDM button.
2007-2009 Turf 252, Carryall 252 and XRT 900 Maintenance and Service Manual
Page 22-37
