Component Tests and General Diagnostics
Cellular Mobile Telephone (CMT1OOO/CMT1OOOVR):Troubleshooting:
BMW CMT1OOO/CMT1OOO VR:
Cellular Mobile Phone:
Troubleshooting cellular telephones installed in BMW automobiles is extremely simple.
A. Always suspect programming first. Refer to the user's manual and the PROGRAMMING sections for guidance.
B. Next, examine the Installation. The most frequently encountered problems here are with the antenna, its transmission line, and the crimp-on connector. Check all wiring connections for good mechanical contact.
. Troubleshoot the cellular telephone.
1. Perform operations checks as described in the following pages of this manual and note any abnormalities.
2. Follow troubleshooting tables on the following pages.
Note: If all the preceding checks do not result in failures or error messages, the problem is not with the telephone, but with the cellular system. Inform the carrier of the situation.
D. If the problem is in the hardware, determine which module is faulty by swapping out these pieces with known good alternatives (e.g., handset, interface, wiring, or transceiver). The following pages covering troubleshooting may be of general help in solving problems with BMW transceivers.
1. If the problem is not in the transceiver, replace the faulty component.
2. If the problem is the transceiver, replace the unit and perform an identity transfer. See the proper procedure in this section.
Out of Box Check:
The procedures outlined here are for initial or operations check-out only and are not intended to replace the other sections of this manual. BMW neither recommends nor supports alignment of modern subscriber products upon initial installation. If a new unit is out of adjustment, it should be returned for replacement.
See the PROGRAMMING section for guidance in initializing the customer's telephone. There is a separate INSTALLATION manual which discusses installation procedures in detail.
Mobile Operations Check
Step 1. Since the BMW cellular telephone interfaces with the auto-mobile's AM-FM radio, these checks should be performed in the vehicle.
Step 2. Make certain the automobile is turned off. Turn the telephone on by pressing the "PWR" button.
Step 3. Observe wake-up (all 8's displayed, backlighting lit, and DTMF tones heard). Note that the display then changes to LOC'D.
Step 4. Enter "456", then "CLR". This is not the factory lock code and the display should not change from LOC'D.
Step 5. Enter the three digit unlock code ("123" as supplied from the factory) and observe that LOC'D is replaced by on or S (for signal meter) in the display.
Step 6. Lock the telephone by pressing "FCN 5" and observe that the unit displays LOC'D accompanied by an audible confirmation tone.
Step 7. Enter the three-digit unlock code ("123" as supplied from the factory). The unit should unlock and display ON or S (for signal meter).
Step 8. Enter all 8's in the display and note that all segments are lit evenly. Press "CLR" to clear the display.
Step 9. Enter "123456789*O#." As each key is pressed, the appropriate number should scroll across the screen. The final display should read. 123456789AOC.
Step 10. If the unit is a new telephone, enter "STORE 01" to store a number into user memory. The display should read 01 and "123456789A0C" should be stored in location 01. If the unit has already been in use, make certain there is no information already stored in location 01.
Step 11. Press "CLEAR," then "RCL 01." The display should now read 01 345 and 6789AOC. The "123" digits are stored but not display at this time.
Step 12. Press "RCL". The display should now display or scroll the digits previously entered.
Step 13. Adjust the speaker volume while on hook to verify that all levels work, both up and down. Also verify that the alert volume works properly by pressing FCN and then pressing the volume keys. Also verify handset earpiece by lifting the handset and pressing the volume keys.
Step 14. Press "RCL#" to display the unit's telephone number. Write this number down.
Step 15. Turn the automobile AM-FM radio on.
Step 16. From a landline telephone; place a call to the unit.
Step 17. Note that as the telephone rings the AM-FM radio is muted.
Step 18. Turn the automobile ignition switch to off.
Step 19. Note that the telephone continues to ring even though the automobile has been turned off.
Step 20. Terminate the landline call.
Testing the Antenna:
Installation with RSSI:
Received Signal Strength Indicator (RSSI) is a feature of the telephone Used to check the entire antenna installation, including the crimp-on connectors, the transmission line (antenna cable), and the antenna itself. The procedure outlined here should be accomplished with the vehicle stationary; in a good cellular coverage area. It requires the use of a known good shop cellular antenna (preferably a magnetic mount antenna).
Step 1. Place the unit in status display mode.
Description and Operation
Step 2. Carefully watch the top row of the status display. The numbers will continue to change for a short time. Wait until the (3) digit channel number (the upper left 3 characters) remains the same.
Description and Operation
Step 3. Read the RSSI by locating the upper 3 characters in the status display. Record this value.
Description and Operation
Step 4. Disconnect the antenna transmission line from the RF port of the transceiver. Connect a known good shop (magnetic mount) antenna to the RF port of the transceiver. Position the shop antenna at least 14 inches from the customer's antenna.
Step 5. Repeat step 2. Make sure that the channel number is the same channel used in step 2. If you are unable to get a reading using the same channel, this procedure is invalid.
Step 6. Repeat step 3 and record the new RSSI value. Compare the two RSSI readings. If they are not relatively close to each other, less than 15 numbers apart, the antenna installation may be faulty.
Note: A faulty antenna installation is most often the result of a faulty crimp-on connector. If the connectors are good, suspect that the transmission line has been damaged. Rarely is the problem with the antenna itself.
25 Pin D-Sub Transceiver Connector:
NOTE: MANY OF THE FOLLOWING TESTS ASSUME THAT THERE IS ADEQUATE CELLULAR COVERAGE IN THE AREA.
BMW Mobile Identity Transfer:
The identity transfer procedure allows the cellular telephone number; electronic serial number, system parameters, and telephone numbers in memory to be transferred from a defective telephone to a replacement unit. It is now possible to perform an identity transfer on currently manufactured Motorola cellular telephones, including the models installed in BMW automobiles.
If a cellular telephone capable of accepting an identity transfer is found to be defective, it must be replaced. A spare transceiver of the exact same model number as the defective unit is required. If the wrong replacement telephone type is used, "FAIL 11" will appear in the display, indicating the error.
Identity Transfer Procedure:
CAUTION!
An anti-static wrist band, connected to an anti-static (conductive) work surface, must be worn during all phases of the Identity Transfer Procedure.
NOTE:
The replacement transceiver and defective transceiver must be turned off during connection.
Step 1. Connect the spare transceiver to an identity transfer connector (SLN7O12B) and cable kit with no power applied. Connect the handset either directly to the telephone or to the handset connector on the cable kit.
Step 2. With no power applied to the control/power cable, connect the female DB25 connector wired to the test mode connector as shown on the diagram on the next page. Apply power and ground to the control/power cable.
CAUTION!
If units are reversed (not connected as shown on the diagram) the transfer will be reversed and the customer's information may be lost.
Step 3. Press the "PWR" key to turn on the units. Press "#66#" to begin the transfer. The handset display will read "66" while the transfer is taking place, and the "66" will be replaced by "PASS" or "FAIL' when finished.
Step 4. If the Identity Transfer is successful, "PASS" appears in the handset display. Verify the ESN on the replacement unit using the 38# test command.
If the Identity Transfer is unsuccessful, "FAIL" appears in the handset display. Either try again or replace the defective unit.
Step 5. Next power down both units by pressing the PWR key on the handset.