Why doesn't A/C controller light up or turn on?

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

all these circuits share some common fuses, check fuse #6 ( 10 amp ), fuse # 11 ( 15 amp ) & fuse #12 ( 10 amp ) all in the inside fuse box at the left end of the dash.....good luck

Please review this article: Where's The Fuse?




1. 5 Amp (Tan) - Instrument panel lights and lights-on reminder
2. 20 Amp (Yellow) - Choke heater
3. 30 Amp - Circuit Breaker. Power windows and sunroof
4. 10 Amp (Red) - Electronic control module
5. 25 Amp (White) - Heater and air conditioning
6. 20 Amp (Yellow - Stop and hazard lights
7. 25 Amp (white) - Windshield wipers
8. 10 Amp (Red) - Radio and cruise control
9. 30 Amp - Circuit Breaker. - Power door locks, seats and rear window defogger
10. 20 Amp (Yellow) - Courtesy lights, key warning chime, power antenna, horns, cigar lighter and clock
11. 20 Amp (Yellow) - Turn signals and back-up lamps
12. 20 Amp (Yellow) - Parking, side marker, license plate and tail lamps
13. 10 Amp (Red) - Warning lamps and buzzers, trunk release, torque converter clutch and vehicle
speed sensor
14. Not Used

Cavity Fuse Description
1) 15 Amp Blue Horn Relay, Power Sunroof
Relay, Power Window Relay
2) 10 Amp Red Rear Fog Lights (Export Only)
3) 20 Amp Yellow Cigar Lighter
4) 10 Amp Red Headlight Low Beam Right
5) 10 Amp Red Headlight Low Beam Left
6) 20 Amp Yellow Body Control Module/Power Door Locks
7 )10 Amp Red Left Park Light/Left Tail Lamp/License Plate Lamp
8) Spare
9) 10 Amp Red Right Park Light/RightTail Lamp/License Plate Lamp/Cluster
10) Spare Cavity Fuse Description
11) 15 Amp Blue Flasher
12) 15 Amp Blue Stop Lights
13) 10 Amp Red Body Control Module/CMTC/Cluster/Pass. Airbag On,Off Indicator, Auto Daylight
Mirror/Light Bar Switch (Renegade Only)
14) 10 Amp Red PDC Fuel Pump/AC Clutch,
Starter Relay/Engine
Controller/Transmission
Controller (Diesel Only)
15) Spare
16) 20 Amp Yellow Power Outlet (Rear)
17) 15 Amp Blue Rear Wiper
18) 20 Amp Yellow Radio Choke & Relay
Cavity Fuse Description
19 20 Amp Yellow
Frt Fog Lights/Trailer Tow
Stop and Turn Lights
20 Spare
21 10 Amp Red Radio
22 20 Amp Yellow
Power Sunroof Relay/
Antenna Module (Export
Only)
23 Spare
24 10 Amp Red PDC Blower Motor
25 10 Amp Red Heated Seat Switches/HVAC
Control Head/Trailer Tow
Battery Charge
26 10 Amp Red Headlight High Beam Right
27 10 Amp Red Headlight High Beam Left
28 Spare
29 10 Amp Red Heated Mirrors/Rear Window
Defroster Indicator
Cavity Fuse Description
30 15 Amp Blue Heated Seat Module
31 Spare
32 10 Amp Red Wiper Switch/Front and
Rear Wipers
33 10 Amp Red SKIM Module/Data Link
Connector
34 15 Amp Blue Body Control Module/
Cluster/Interior Lights,
Hands Free Module/Radio/
CMTC/ITM Module & Siren
(Export Only)
35 Spare
36 10 Amp Red Airbag Control Module/
Occupation Classification
Module (Right Front Seat)
37 10 Amp Red Airbag Control Module
38 10 Amp Red ABS Controller/Shifter Assembly
39 10 Amp Red Hazard Flasher (Turn
Signals)/Backup Lamp
Switch (Manual Transmission
Only)/Transmission Range
Switch (Automatic Transmis

Before you get started, please review this article: Where's The Fuse?

Keeping the information in the article above in mind, the fuse that supplies power to the marker lights is located in the engine compartment fuse block It is fuse# 60. it is a 10 Amp fuse. This fuse supplies power to the Tail Lamp Relay which is located in relay box #1. This relay is controlled by the Auto Light Control Unit, which in turn, is controlled by the main lighting switch.
The Auto Light Control Unit gets its power from fuse #30 (10 Amp) which is located in the Instrument panel fuse block under the left side of the dash.

Morning Charlie,

If it were me, I would check the wires coming & going to & from engine. Maybe something is crossed. That's what it sounds like, anyways.

Clock Memory Fuse 8 and Digital Clock Fuse 6 .
--------
A/C Compressor Clutch Fuse 17
A/C Heater Control Switch Fuse 17
A/C-Heater Mode Switch Fuse 9
Air Bag Diagnostic Monitor Fuse 7
Air Bags Fuse 5
Amplifier Fuse 11
Autolamp Dual Coil Relay Fuse 4
Backup Lamps Fuse 5
Blower Motor Speed Controller Fuse 17
Clock Memory Fuse 8
Courtesy Lamps Fuses 6 & 8
Daytime Running Lamps Fuses 5 & 10
Digital Clock Fuse 6
Digital Instrument Cluster Fuses 5 & 16
EATC Blend Door Actuator [1] Fuse 17
EATC Blower Motor [1] Fuse 9
EATC Control Module [1] Fuses 5 & 16
Exterior Lamps Fuses 4 & 15
Flash-to-Pass Switch Fuse 10
Hazard Lamps Fuse 1
Heated Oxygen Sensor Fuse 5
Illuminated Entry Fuse 5
Illuminated Entry Module Fuse 8
Instrument Illumination Fuse 13
Keyless Entry Fuses 5 & 8
LCD Dimming Relay Fuse 6
Lamps On Warning Fuse 4
Lamp Out Warning Fuses 6 & 15
Liftgate Window Defrost Fuse 6
Liftgate Window Washer Fuse 6
Liftgate Window Wiper Fuse 6
Light Sensor/Amplifier Fuse 18
Low Oil Level Relay Fuse 18
Main Light Switch Fuse 6
Manual Lever Position Sensor Fuses 5 & 10
Mobile Telephone Transceiver Fuse 11
Police Accessory Relay Fuse 6
Power Antenna Fuse 11
Power Mirrors Fuse 8
Power Windows Fuse 6
Radio Fuse 11
Radio Memory Fuse 8
Rear Window Defrost Fuse 5
Redundant Radio Control Fuse 11
Shift Lock Actuator Fuse 5
Speed Control Amplifier Fuse 6
Speed Control Deactivator Switch Fuse 1
Stop Lamps Fuse 1
Transmission Control Switch Fuse 18
Turn Lamps Fuse 1
Turn Signals Fuse 5
Variable Assist Power Steering Module Fuse 5
Warning Chime Fuse 6
Warning Chime Module Fuse 18
Warning Indicators Fuse 18
Windshield Wiper Control Module Fuse 2
Windshield Wiper Motor Fuse 2.
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this will help.thanks.

Here are the numbers on your fuseblock and fuses coresponding to the number that is on your fuse block.
1-20 amp (yellow)
Hazard flasher
2-10 amp (red)
back up lights, A/C clutch cycling Switch
3-30 amp (green)
Power windows
4-30 amp (yellow)
A/C or heater blower motor
5-20 amp (yellow)
Panel Lights, Side marker lights, Park, Taillights, Clock & radio display Intensity, License & panel lights.
#6-10 amp (red)
Stoplight, buzzers, Anti-lock brake module
#7-15 amp (lt. Blue)
Tachometer, horn & Relay
#8-8 amp (yellow)
Power Door locks
#9-10 amp (red)
Radio
#10-10 amp (red)
Rear Wheel Anti-lock module, Turn Signals
#11-20 amp (Yellow)
Windshield wiper & washers
#12-15 amp ( LT. Blue)
Cigarette Lighter
#13-5 amp (tan)
Speed Control, warning buzzers, gauges, indicator lights
#14-5 amp (tan)
Time/delay relay & under-hood light, dome light, power mirrors, readio & clock Memory, Interior lights, reading lights
#15-blank
Not used
#16-4 amp (pink)
Radio Lights & overdrive switch light 1989-91, Cluster lights, Cigarette Lighter light & as tray light, Cluster lights, A/C & heater controls.
#17-relay
Hazard Flasher warning
#18-relay
Relay
#19-Circuit breaker
#20-relay
Turn signal Flasher
#21-buzzer
Warning
#22-Relay
Horn

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats

Fuse #8, #18 and #22.

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats