If you don't want to have a Volvo shop scan the code then resetting it by disconnecting the battery for 5 minutes to clear it probably won't help.
Volvo brake control modules have a common problem caused by heat which weakens the solder connections on the circuit board. You have a few options.
Remove the module and have it rebuilt.
Replace it with a new module.
Rebuild it yourself. If you know how to use a soldering iron, Google the repair for 1998 s70 brake ecm repair and you should be able to find it fairly easy.
The brake ecm can cause problems with the instruments, traction control, transmission shifting, your speedometer may stop while you are moving, you may have to manually shift down an automatic transmission to be able to take off and so forth.
With an OBD2 code reader
The reset code is on the back of the radio,
With an OBD2 code reader
After repairing the cause of the code, you reset it with a scan tool.
After repairing the cause of the code, you clear the code with a scan tool.
Disconnect the battery for 5 minutes get the radio code before doing this
You have to plug it into a computer/diagnostics machine for it to reset. Also, you will see that the code for your problem is fixed, or not.
You can clear the code with a scan tool or by unhooking the battery. If the cause is not repaired, the light will return.
After the cause of the code is repaired, the light is reset with a scan tool.After the cause of the code is repaired, the light is reset with a scan tool.
When a car is being inspected, it cannot have the airbag light on. The light can be reset by an OBDii scanner, that will clear the code causing the problem or by disconnecting the battery for 30+ minutes.
You need a code reader to reset & plug into port.
If you have a local Autozone near by go there and ask to pull code then ask to have code cleared. They will do this.