I have a 1998 volvo single screw truck with a detroit 60 engine won,t start and have the seat belt and the air brake light on with key off and the air brake low buzzard don,t work no

FUSE PANEL LOCATION
The fuse panel is located in the engine compartment. A label on the inside of the cover lists the fuse amperage and circuits protected.
volvo 850 fuses fuse panel layout service repair manual
FUSE PANEL IDENTIFICATION
Fig. 1: Fuse Panel Identification
Courtesy of Volvo Cars of North America.
WARNING: Always disconnect battery ground cable before servicing "high-current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician.
* 1 - 15 Amp
Fuel Injection, Distributor Ignition, Automatic Gearbox
* 2 - 15 Amp
Fuel Pump, Alarm System
* 3 - 10 Amp
Courtesy Lights, Oil Level Sensor
* 4 - Not Used (1993-95)
* 4 - 10 Amp (1996)
Electronic Start Inhibitor (Immobilizer)
* 5 - 30 Amp
ECC Blower (Speed 4)
* 6 - 25 Amp
Central Locking System, Alarm
* 7 - 15 Amp
Audio System (Amplifier)
* 8 - 25 Amp (1993-95)
Power Antenna, Trailer Connector
* 8 - 40 Amp (1996)
Electronic Start Inhibitor (Immobilizer)
* 9 - 30 Amp
ABS, Traction Control System
* 10 - Not Used (1993-95)
* 10 - 15 Amp (1996)
Heated Rear Seat (If Equipped)
* 11 - 30 Amp
Heated Rear Window & Side Mirrors
* 12 - 10 Amp
Brake Lights
* 13 - 15 Amp
Hazard Flashers, Headlight Flashers, Alarm
* 14 - 30 Amp
ABS, Traction Control System
* 15 - 10 Amp (1993-95)
Audio System, Courtesy Lights, Door Open Light, Trunk Light, Glove Box Light, Remote Control Central Locking System,
Oil Level Sensor, Seat Belt Reminder
* 15 - 10 Amp (1996)
Audio System, Courtesy Lights, Door Open Light, Trunk Light, Glove Box Light, Remote Control Central Locking System,
Oil Level Sensor, Seat Belt Reminder, Data Link Connector
* 16 - 30 Amp (1993-95) Accessories
* 16 - 30 Amp (1996)
Power Antenna, Trailer Connector, Accessories
* 17 - 10 Amp
Key Reminder
* 18 - 25 Amp (1993-95)
Heated Front Seats, Power Mirrors
* 18 - 15 Amp (1996) Front Fog Lamps
* 19 - 15 Amp
Left High Beam Headlight
* 20 - 15 Amp
Right High Beam Headlight, High Beam Indicator
* 21 - 15 Amp
Left Low Beam Headlight
* 22 - 15 Amp
Right Low Beam Headlight
* 23 - 10 Amp
Left Parking Light, License Light
* 24 - 10 Amp
Right Parking Light, Bulb Failure Warning Sensor
* 25 - 10 Amp
Rear Fog Lamps, Fog Lamp Indicator
* 26 - Not Used (1993-95)
* 26 - 25 Amp (1996)
Heated Front Seats, Power Mirrors
* 27 - 15 Amp
Back-Up Lights, Turn Signals
* 28 - 10 Amp
Cruise Control, Heated Rear Window, Seat Belt Reminder Light, Shiftlock, Bulb Failure Warning Sensor, Heated Rear Seat
* 29 - 15 Amp
ABS, Traction Control System
* 30 - 10 Amp
Cigarette Lighter
* 31 - 25 Amp
ECC, ECC Blower (Speeds 1-3)
* 32 - 10 Amp
Audio System, Remote Controlled Central Locking System
* 33 - 15 Amp (1993-95)
Power Seats, OBD Test Socket, Tailgate Washer/Wipe (Wagon)
* 33 - 15 Amp (1996)
Power Seats, Tailgate Washer/Wipe (Wagon)
* 34 - 25 Amp
Windshield Wiper/Washer, Horn, Headlight Washer/Wiper
* 35 - 10 Amp
Instrument Lights, Sun Roof, Traction Control System
* 36 - Not Used
* 37 - Circuit Breaker
Power Windows, Power Sun Roof
* 38 - Not Used
* 39 - Circuit Breaker
Drivers Power Seat
* 40 - Circuit Breaker
Passengers Power Seat
RELAY PANEL LOCATION
The relay panel is located at the left corner of the instrument panel.
i copied this off a volvo site Hope this helps

1. Turn the ignition switch to the off position and buckle the seat belt
2. Turn the ignition switch to run (engine does not need to be running), wait for the seat belt light to turn off.
3. Within 60 seconds, unbuckle and rebuckle the drivers seat belt at least 3 times, ending with the seat belt buckled.
4. Turn the ignition key to the off position. A single chime will sound to signify that you have successfully completed the programming.

It can be reactivated by repeating these steps.

The alert will be deactivated but the warning light will continue to stay on will the belt is unfastened.

First check your fuses and clean them and coat them with Dielectric grease, then try replacing the Relay if that does not fix it.

Start with this:

The locking mechanism is plastic and usually brakes apart inside. It needs to be replaced. Because it is a 96 model, I would not trust used parts. Buy new from Volvo. They run in the $200 range for the part.

There are a number of things that can cause this beeping to happen. Problems in the Air Bag system, Seat Belts, Low Fuel, door or trunk Ajar, Low Washer fluid, Parking Brake on, Going too fast, Turn Signal On, Key-In Ignition, Exterior Lamps ON, Warning Lamp Announcement, or Transmission Over Temperature. You can try the self test to see if there are any codes stored in the computer, if needed.

1. Cycle the ignition key On - Off - On - Off - On within 5 seconds.

2. Count the number of times the Engine light flashes. The number of flashes represents the code. There is a slight pause between the flashes representing the first and second digits of the code. All codes are 2 digits. There are longer pauses separate individual two digit trouble codes.

There are 3 cables under the driver's seat.
1) 1 (single wire) goes to the illumination light of the transfer case position plastic lense panel (underside) 2) 1 (single wire) goes to the seat belt harness for the seat belt warning light 3) 1 (multi-wire) goes to air bag sensor located directly under the seat.
Your welcome :-)
Steve

Brake light comes on auto each time you start the car (saftey check) and will go off when you press brake pedal.

Blinking arrow will stop when you click seat belt together (driver)

turn ign off press key in towards drive stem and turn anti clock (5degs)and pull out

Put in key hold in mileage reset button and turn key to on (dont start the car )the last click before starting (and keep finger on miles reset button till flashing stops
then turn off ,this resets all service lights,
tc

Sounds like either you did not connect the seat belt restraint wiring when the seats where put back in. This is a common problem. You will need to look under the seat and make sure that there are no loose wiring at all. The SRS is for the seatbelts.

it is you have to remove belt to get seat up the tab that keeps belt from retracting too far came off