B0970Interior Light Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0970 is not documented anywhere public, whether in J2012 extracts, workshop literature or NHTSA bulletins. The title covers the interior lighting circuit. The 2003–2012 Saab 9-3 supervises it through its BCM: B2556 02 when more than 10 A flows on the lamp feed, B2555 0F when the lamps are powered although they should be off, and B2610 02 when the dimmed PWM line drops below 2.0 V. GM's 2011 Saab 9-5 reports a grounded courtesy lamp feed as B2615 02, stops driving the lamps and clears the history entry after 100 fault-free ignition cycles. HELLA warns that fitting bulbs of higher wattage overheats lamps and surrounding trim. A constantly lit interior lamp can drain the battery overnight.
- What you may notice
- Interior lights stay off when a door is opened
- Interior lights stay on permanently
- Battery flat after the car has stood overnight
- Likely causes
- LikelyDoor contact switch stuck, keeping the lamps on
- PossibleShort in a roof or footwell lamp, often after bulb changes
- PossibleChafed wire in the headliner or A-pillar
- RareLamp output of the body control module faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.