Continental Automotive Technologies 5WK49308 Transmitter User Manual Manual
Continental Automotive GmbH Transmitter Manual
Manual
Annex No.5 
Page 1 of 7 
Functional Description 
Key: 5WK4 9308 

Siemens AG 
Siemens VDO Automotive    SV I IC PE RF Design 
 IC: 267T-5WK49308                                                                      FCC ID:KR55WK49308 
I:\POSTZULA\Honda\Tx\Technische_Doku_doc\Func_Description_Honda-Tx-Transmitter_v1.doc    Page 1 of 6
 User Manual  
of the  
Siemens VDO 
 Radio Frequency Transmitter  
Type 
  5wk4 9308 
5wk4 9309 
5wk4 9348 
5wk4 9349 
5wk4 9542 

Siemens AG 
Siemens VDO Automotive    SV I IC PE RF Design 
 IC: 267T-5WK49308                                                                      FCC ID:KR55WK49308 
I:\POSTZULA\Honda\Tx\Technische_Doku_doc\Func_Description_Honda-Tx-Transmitter_v1.doc    Page 2 of 6
1. GENERAL DESCRIPTION OF THE RF TRANSMITTER  
The RF remote control system consists of a RF transmitter and a RF receiver 
mounted within the control unit. The RF transmitter is mechanically integrated 
in the head of the key. This transmitter is used to transmit information for 
locking or unlocking the vehicle by a unidirectional RF transmission line for 
normal remote operation by pressing a button. 
In general the following functions are provided: 
-  Lock the car 
-  Unlock the car 
-  Unlock the trunk of the car 
-    Panic Alarm 
Immobilizer Transponder  
When the key is operating as an immobilizer transponder, communication is 
done over a "contact less interface" depending on strong magnetic coupling. 
The transponder is the passive side of the link and there is no RF 
transmission from it involved in any aspect. 
SW1 
SW2 
SW4 
SW3 

Siemens AG 
Siemens VDO Automotive    SV I IC PE RF Design 
 IC: 267T-5WK49308                                                                      FCC ID:KR55WK49308 
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2. POWER SUPPLY 
 The transmitter is provided with 1 lithium battery (CR1616) that gives a 
power supply of +3V.  
3. TYPICAL USAGE PATTERN (FOR EUROPE ONLY)  
 20  lock/unlock operations in 24 hours with complete transmission duration 
of  10.0 seconds (500ms/operation) 
2 power window up/down operations in 24 hours with transmission duration 
of  10 seconds ( 5.0 seconds for 1 operation; max. value) 
→ total transmission duration of  20  seconds within 24 hours 
Transmitter ON     0.83 seconds / hour 
Transmitter OFF    3599.17   seconds / hour 
Duty Cycle: TON / T (ON+OFF)  x 100% = 0.83/ 3600 x 100 % = 0.023  % 
Siemens 
MLFB  5wk49308 5wk49309 5wk49348 5wk49349 5wk49542 
Frequency 
variant 313,85 MHz 
(USA) 434.92 MHz 
(EU) 313.85 MHz 
(USA) 
313.85 MHz 
Low Power 
(Japan) 
434.92 MHz 
(EU) 
Number of 
buttons   4 buttons 3 buttons   3 buttons   3 buttons  
4 buttons 
SW 1 Look   Look   Look   Look   Look  
SW 2  Unlock  Unlock   Unlock  Unlock  Unlock 
SW 3  Trunk  Trunk  Trunk  Trunk  Trunk 
SW 4 Panic           Panic 


Siemens AG 
Siemens VDO Automotive    SV I IC PE RF Design 
 IC: 267T-5WK49308                                                                      FCC ID:KR55WK49308 
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5. TECHNICAL DATA 
Tx Electrical characteristics 
Tx Europe (433.92MHz) variants: 
Variants Siemens MLFB 
Europe 3-button Lock-Unlock-Trunk 5wk4 9309 
Europe 4-button Lock-Unlock-Trunk-Panic 5wk4 9542  
Center frequency 433.92MHz 
Frequency shift +/-30kHz 
RF-Power (EIRP) < 10 mW 
Tx US (313.85 MHz) variants: 
Variants Siemens MLFB 
US 3-button Lock-Unlock-Trunk 5wk4 9348 
US 4-button Lock-Unlock-Trunk-Panic 5wk4 9308 
Center frequency 313.85 MHz 
Frequency shift +/-30kHz 
RF-Power (EIRP) < 75.6 dBµV/m 
Tx Japan (313.85 MHz Low Power) variant: 
Variants Siemens MLFB 
Japan 3-button Lock-Unlock-Trunk 5wk4 9349 
Center frequency 313.85 MHz 
Frequency shift +/-30kHz 
RF-Power (EIRP) < 54 dBµV/m 
NOTE: 
Changes or modifications not expressly approved by the manufacturer 
could void the user's authority to operate the equipment.  
Parameter Unit Min. Typ. Max. 
Supply voltage  V  2.5  3  3.3 
Battery lifetime (10 actuations per day) 
[/years]  a    4   

Siemens AG 
Siemens VDO Automotive    SV I IC PE RF Design 
 IC: 267T-5WK49308                                                                      FCC ID:KR55WK49308 
I:\POSTZULA\Honda\Tx\Technische_Doku_doc\Func_Description_Honda-Tx-Transmitter_v1.doc    Page 6 of 6
6.1 LABEL DESIGN Europe (433.92 MHz) 
Siemens VDO 
5WK4 9542 
6.2 LABEL DESIGN CANADA, MEXICO, USA (314,85 MHz) 
Siemens VDO 
5WK4 9308 
IC: 267T-5WK49308 
FCC ID:KR55WK49308 
Entry Owners Manual, Canada, USA: 
NOTE 
This device complies with part 15 of the FCC Rules and RSS-210. 
Operation is subject to the following two conditions: (1) This device may not 
cause harmful interference, and (2) this device must accept interference 
received, including interference that may cause undesired operation. 
CAUTION 
Changes or modifications not expressly approved by the manufacturer 
could avoid the user's authority to operate the equipment.