The B1106 code on your 2022 Subaru Forester indicates an open circuit in the interior lamp system. This code affects your Forester's interior lighting, signaling a complete break in the circuit preventing current flow to one or more interior lights.
Understanding B1106 on Subaru Forester
An open circuit means there's a break somewhere preventing electrical flow - like a broken wire, burned out bulb, or disconnected connector. The body integrated unit monitors interior lighting circuits and sets B1106 when it detects no current flow where it expects to see current.
Common Symptoms
- One or more interior lights not working
- Map lights inoperative
- Courtesy lights don't illuminate
- Cargo area light not working
- Reading lights inoperative
Primary Causes
- Burned out bulb(s)
- Broken wire in circuit
- Disconnected connector
- Corroded lamp socket
- Fuse blown (causes all lights on circuit to fail)
- Poor ground connection
Diagnostic Procedure for 2022 Forester
Using Subaru scan tool, identify which specific interior light circuit has the fault. Check bulb condition - burned out bulbs are most common. Inspect fuse for interior light circuit. Check for voltage at light socket. Test ground continuity. Trace wiring for breaks, especially through hinges and moving parts.
Repair Solutions
Replace burned out bulbs. Replace blown fuse after checking for shorts. Repair broken wires with proper splicing. Clean corroded lamp sockets. Restore poor ground connections. After repair, clear codes and verify all interior lights function in all modes (door, manual, timer).