Driver seat unit
NOTE: If a unit or component is likely to fail and the vehicle is still under manufacturer's warranty, refer to the warranty manual before replacing the component (section B1.2) or determine if there is any previously approved special program in operation.
NOTE: Universal Scan Tools may not read the listed codes or may only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the 7-digit code listed to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).
NOTE: Always use a digital multimeter when performing voltage or resistance tests (DMM) accurate to three decimal places and with a valid calibration certificate. When testing resistance, be sure to consider the resistance of the DMM leads.
NOTE: Before starting diagnostic programs using troubleshooting tests, check and correct major problems.
NOTE: Inspect the connectors for signs of water intrusion and their pins for damage and (or) traces of corrosion.
NOTE: If DTCs are logged and there is no problem after performing troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded contacts.
Description and operation
For a detailed description of the driver's seat system, see the relevant section «Description and operation» repair manuals. For more information, see the chapter: Seats (501-10 Seat Description and function).
| DTC | Description | Possible reason | Action |
| B1C02-24 | Save settings button | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1C03-24 | Memory 1 button | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1C04-24 | Memory button 2 | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1C05-24 | Memory button 3 | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1B94-24 | Seat up button | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1B95-24 | Seat down button | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1B96-24 | Seat forward button | Constantly high signal level | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| B1B97-24 | Seat back button | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1C00-24 | Seat back tilt reduction switch | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1C01-24 | Seat back tilt switch | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. | |
| B1B86-15 | Seat adjustment motor relay | Seat Height Motor Circuit - Short to Power | Refer to the wiring diagrams to check the seat height adjustment motor circuit for a short to power. |
| B1B86-11 | Seat adjustment motor relay | Seat height adjustment motor circuit - short to ground | Refer to the wiring diagrams to check the seat height adjustment motor circuit for a short to ground. |
| B1B88-15 | Seat longitudinal motor relay | Seat fore/aft motor circuit - short to power | Refer to the electrical circuit diagrams to check the fore/aft adjustment motor circuit for a short to power. |
| B1B88-11 | Seat longitudinal motor relay | Seat fore/aft motor circuit - short to ground | Refer to the electrical circuit diagrams to check the fore/aft adjustment motor circuit for a short to ground. |
| B1B92-15 | Seat back tilt motor relay | Seat Tilt Motor Circuit - Short to Power | Refer to the electrical circuit diagrams to check the seat tilt motor circuit for a short to power. |
| B1B92-11 | Seat back tilt motor relay | Seat tilt motor circuit - short to ground | Refer to the electrical circuit diagrams to check the seat tilt motor circuit for a short to ground. |
| B1B87-31 | Seat Height Speed/Position Sensor | No signal | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| B1B89-31 | Seat fore/aft speed/position sensor | No signal | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| B1B93-31 | Speed/Position Sensor for Power Backrest Tilt Adjustment | No signal | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| U1A14-49 | CAN initialization failure | Internal malfunction of electronic equipment | Install a new driver seat module, refer to the new unit installation note at the top of the DTC index. |
| U0010-88 | Medium speed CAN communication bus | Bus shutdown | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| U0140-00 | Loss of communication with the central junction box | Loss of communication with the central junction box | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| U0199-00 | Lost Communication with Driver Door Module (DDM) | Lost communication with the driver's door unit (DDM) | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| U1A4C-68 | Install/setup mode is active when the vehicle exits the assembly line. | Factory mode has not been deleted | Place the driver's seat module in user mode using the manufacturer's approved diagnostic system. |
| U3000-49 | Control block | Internal malfunction of electronic equipment | Install a new driver seat module, refer to the new unit installation note at the top of the DTC index. |
| U3003-16 | Battery voltage | Circuit voltage below limit | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
| U3003-17 | Battery voltage | Circuit voltage over limit | Using the manufacturer approved diagnostic system, perform troubleshooting tests for this DTC. |
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