DTC B13C3 09: LF Control Unit Malfunction: Notes
WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC B13C3:09 (ADVANCED KEYLESS ENTRY SYSTEM) DETECTION CONDITION AND POSSIBLE CAUSES
| Description |
LF control unit malfunction |
| Detection condition |
- Start stop unit detects that the LF state signal of the LF control unit is low for 5 s or more
.
- With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is the signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.
|
| Fail-safe function |
- Inhibits the door lock/unlock control using the advanced keyless entry system.
|
| Possible cause |
- LF control unit connector or terminal malfunction
- Start stop unit connector or terminal malfunction
- Short to ground in wiring harness between start stop unit terminal 2H and LF control unit terminal K
- Open circuit in wiring harness between start stop unit terminal 2H and LF control unit terminal K
- LF control unit malfunction
- Start stop unit malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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