Body, generic

B0700 Sunroof Open/Close Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No accessible J2012 list, public manufacturer manual or NHTSA bulletin contains B0700, so the code cannot be verified. Its title points to the circuit that drives a power sunroof open and shut. GM-era Saab cars report such faults under their own numbers: the 9-3 sunroof module stores B3661 0E when motor current is too high and B3664 04 for an open switch line, after which button presses are ignored; B3664 0A follows if the same switch position is seen for over 30 s. In the 2011 Saab 9-5 the module reads the switch as a resistor ladder and reports B3664 to the BCM via LIN. FMVSS 118 demands that a closing roof panel reverses before it squeezes with 100 N, which is why motor current is supervised at all. Position feedback: B0710.

Likely causes

Dirty or dry guide rails raising motor current
Sunroof switch or its wiring faulty
Sunroof motor or gearbox worn
Sunroof control electronics faulty

Symptoms

  • Sunroof does not move when the button is pressed
  • Roof stops or reverses on its own while closing
  • Motor hums without the panel moving

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–900
Time0.5–4 h

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

Parts involved

sunroof motorsunroof control module

Related codes

B0710

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