Body, generic

B0970 Interior Light Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Door contact switch stuck, keeping the lamps on
Short in a roof or footwell lamp, often after bulb changes
Chafed wire in the headliner or A-pillar
Lamp output of the body control module faulty

Symptoms

  • Interior lights stay off when a door is opened
  • Interior lights stay on permanently
  • Battery flat after the car has stood overnight

Repair estimate

DifficultyEasyDIY possible
Parts and labour€10–250
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

interior lampbody control module

Related codes

B0260

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, saabwisonline.com.