LIN Bus A (+) Open
2003-2009 Toyota 4Runner 4.7L V8
Description
The LIN bus A wire is open, preventing communication with LIN slave devices.
Symptoms
- LIN-connected devices inoperative
- Seat memory not working
- Rain sensor offline
- Interior lighting module offline
Common Causes
- Broken LIN bus wire
- Corroded LIN connector
- LIN module unplugged
- Wiring harness damage
Diagnostic Steps
- Check LIN bus wire continuity
- Inspect connectors
- Test for 12V pullup on LIN bus
- Check LIN master output
Repair Notes
Repair open LIN bus wire. Check connectors at all LIN slave devices.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0005High Speed CAN Communication Bus (+) High
U0038 on Other Vehicles
Toyota 4Runner
2003-2009 4.0L V6
Toyota 4Runner
2010-2024 4.0L V6
Toyota 86
2017-2020 2.0L H4
Toyota Alphard
2023-2025 2.4L I4 Turbo T24A-FTS
Toyota Alphard
2023-2025 2.5L I4 Hybrid A25A-FXS
Toyota Altezza
1998-2005 2.0L I4 3S-GE BEAMS
Toyota Altezza
1998-2005 2.0L I6 1G-FE
Toyota Aqua
2011-2021 1.5L I4 Hybrid 1NZ-FXE
Common Questions
What does code U0038 mean on a 2003-2009 Toyota 4Runner?
U0038 stands for "LIN Bus A (+) Open". The LIN bus A wire is open, preventing communication with LIN slave devices.
What are the symptoms of U0038 on a Toyota 4Runner?
Common symptoms of U0038 include: LIN-connected devices inoperative, Seat memory not working, Rain sensor offline, Interior lighting module offline.
What causes U0038 on a 2003-2009 Toyota 4Runner?
Common causes of U0038 include: Broken LIN bus wire, Corroded LIN connector, LIN module unplugged, Wiring harness damage.