DTC B1521-87: Communication Error With Rear Seat Warmer Control Unit
B1521:87 (DASH_ESU) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Communication error with rear seat warmer control unit |
| Detection condition |
- The dash-electrical supply unit cannot receive the signals from the rear seat warmer control unit.
|
| Fail-safe |
- Stops the rear seat warmer output.
|
| Possible cause |
- Malfunction in wiring harness (including connector/terminal) between rear seat warmer control unit and dash-electrical supply unit (See CIRCUIT INSPECTION
.) (See CONNECTOR INSPECTION
.)
- Rear seat warmer control unit malfunction (Refer to [REAR SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION
]
).
- Dash-electrical supply unit malfunction (Refer to [DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION
]
).
|
| Repeatability verification procedure |
- Clear the DTC recorded in the memory. (See CLEARING DTC
.)
|
 Courtesy of MAZDA MOTORS CORP.
|
| 1 |
Dash-electrical supply unit |
| 2 |
Rear seat warmer control unit |