U0038low severityNetwork
LIN Bus A (+) Open
on 2007 Toyota 4Runner 4.0L V6 · RWD
What this code means
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.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus