Almighty oxygen jet model o-2 has no power when plugged in power switch light is on but no touch screen or vacuum pump has a fuse at plug at back of unit an 12volt reducer inside china built thanks

Check IG fuse 20A in the fuse box ! this fuse supply's voltage to the coil's an the warning lights .
IG Fuse
20 A powers these thing's !
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A/C Compressor Control Module

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A/C Switch

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Accelerometer

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Daytime Running Lamps (DRL) Control Module

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Fuel Pump Relay

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Generator

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Heated Oxygen Sensor 1 (HO2S1)

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Heated Oxygen Sensor 2 (HO2S2)

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Ignition Coils

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Instrument Cluster

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Main Cruise Control Switch

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Noise Suppressor Filter

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Powertrain Control Module (PCM)

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Remote Control Door Lock Receiver (4-Door)

A2Resource
a great vw resource site

Relays:
Num.Relay Arrangement and Pinout (with control number stamped on relay)
1A/C Relay (13 or 140)
1A/C Switch
2Radiator Cooling Fan
3Fan Switch High Speed
4Battery, Fuse 23
5A/C Clutch (via pressure and temperature switches)
6Main Fusebox Battery Power, Fuse 19
7Main Fusebox Ground
8Fresh Air Fan
2Rear Wiper Relay (72)
1Main Fusebox Ground
2Main Fusebox Run Power, Fuse 4
3Rear Wiper Motor
4Wipe/Wash Signal from Switch
3Digifant Control Unit (30 or 32), Motronic OBD1 Control Unit (109)
1Main Fusebox Ground
2Tachometer
3Main Fusebox Start/Run Power
4Main Fusebox Battery Power
5To ECU (relay ) (1990 G60, ABA/VR6 OBD1 only)
6To ECU and Engine Electronics
4Load Reduction Relay (18)
1From Ignition Switch Run Power
2To Main Fuse Box Run Power
3Main Fusebox Battery Power
4Main Fusebox Ground
5Low Coolant Level Control Unit (43)
1Main Fusebox Start/Run Power
2Low Coolant Level Sensor
3Coolant Temperature Sensor, Gauge
4Main Fusebox Ground
6Flashers (21)
1Main Fusebox Ground
2Flasher Output
3Flasher Input/Power
4X/6 (Trailer Light)
7Headlight Washer (33)
1Main Fusebox Ground (B/4 to C/3 to Ground)
2Headlight Washer Pump
3Headlight Switch Pin 56 (headlights) (B3 to D4 to light power)
4Main Fusebox Battery Power (B/5 to Y/2)
5Windshield Washer Pump (B/1 to B/2 to washer pump power)
8Wash/Wipe/Intermittent Relay (19 for standard relay, 99 for variable intermittent module)
1Main Fusebox Ground
2Intermittent Switch
3Main Fusebox Run Power, Fuse 5
4Park/Low Signal (ground when parked, positive when on low speed)
5Wiper Motor Low Speed Output
6Wash Switch (positive for front wash)
9Seat Belt Warning Control Unit (4 or 29)
1Main Fusebox Ground
2Seat Belt Switch
3Door Switch
4Seatbelt Light
5"Key In" Power from Ignition Switch
6Main Fusebox Start/Run Power
7Automatic Shoulder Belt Controller
9Radio/Lights Buzzer (36)
1Main Fusebox Ground (not used)
2A1/4 (Left Parking Lights)
3Vehicle Speed Sensor
4Seatbelt Light (not used)
5"Key In" Power from Ignition Switch
6Main Fusebox Start/Run Power (not used)
7A2/2 (Right Parking Lights)
10Fog Light Relay (110 for fog lights with low beam headlights only, 53 for parking light/high beam fog lights)
1Parking Light Power
2Headlight Switch Headlight Power (Low/High)
3Fog Light Switch Power, Fuse 10
4Main Fusebox Battery Power
5Main Fusebox Ground
6Low Beam Headlight Power
11Horn (53)
1Main Fusebox Start/Run Power
2To Horns
3Main Fusebox Ground
4From Horn Button
12Fuel Pump Relay (80, 67 or 167)
1Main Fusebox Starter Power (not used)
2Main Fusebox Start/Run Power
3To ECU (Fuel Pump )
4To Fuse 18, Fuel Pump, Oxygen Sensor Heater
5G2/6 (not used)
6Main Fusebox Battery Power From 30B
7G2/7, T1 (not used)
8Main Fusebox Ground (not used)
9M/4, U1/8, G2/5 (not used)
12Glow Plug Relay (102 or 104)
1Main Fusebox Starter Power
2Main Fusebox Start/Run Power
3Engine Temp Sender (preheat)
4Glow Plugs (Z1)To Fuse 18 (not used)
5G2/6 (not used)
6Main Fusebox Battery Power From 30B
7G2/7, T1 (not used)
8Main Fusebox Ground
9Water Separator, Glow Plug Light

remember to check out the website below for more help
http://www.xjamiex.com/mk2resource/electrical/CE2.html

Make sure the ribbon cables or the screens are plugged in. one for each screen and one for the touch screen (i think the touch screen is the one thats causing your problem) its small and comes out easily. please wright back if it works

GO TO THIS SiTE TO CHECK THE FUSE BOX!
http://vwtech.no-ip.info/images/golf/post90.gif

This are the FUSE and RELAY number SLOT!
Fuse No. Description Ampere Rating 1 Headlight, low beam, left 10 2 Headlight, low beam, right 10 3 Instrument panel lights, license plate lights 10 4 Glove compartment light 15 5 Wiper/washer 15 6 Fresh air blower 16-valve only: Air conditioning 20 7 Taillights, side marker light, right 10 8 Taillights, side marker light, left 0 9 Rear window defogger 20 10 2.0 16-valve only: Fog lights 15 11 Headlight, high beam, left,High beam indicator light 10 12 Headlight, high beam, right 10 13 Horn 16-valve only: Radiator cooling fan 10 14 Back-up lights, washer nozzle heaters 10 15 2.0 16-valve only: Engine electronics, stabilizer valve, cold start valve 10 16 Instrument panel warning lights, 16-valve only: Multi function indicator 15 17 Emergency flasher switch, turn signals 10 18 Fuel pump, oxygen sensor heater 20 19 Radiator cooling fan, air conditioning 30 20 Brake lights, cruise control 10 21 Interior lights, digital clock 16-valve only: Luggage compartment light,multi function indicator, central locking 15 22 Radio, cigarette lighter 10
Relays Relay No. Description 1 Air conditioning 2 Open 3 Digifant control unit 4 Load reduction relay 5 Low coolant level control unit or Open 6 Emergency flashers 7 Rear Wiper 8 Intermittent wipers 9 Seat belt warning system control unit (possibly headlight warning too?) 10 Fog lights 11 Horn 12 Fuel pump (except diesel)Glow plugs (diesel) 13 Radiator cooling fan after run (except 16-valve)2.0 16-valve: Starter interlock relay 14 Automatic trans., coolant temperature indicator,starter interlock relay (except 2.0 16-valve)2.0 16-valve: Radiator cooling fan after run 15 ABS pump relay 16 ABS relay 17 Heated seat control unit, driver 18 Heated seat control unit, passenger, or power seat circuit breaker 19 Automatic transmission 20 Open 21 Power window relay, ABS hydraulic pump fuse 22 ABS valves fuse 23 Air conditioning, power seat fuse 24 Power window fuse

if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.

Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

hi from uk may i suggest you try this ? recheck as you have done that although you have power to the switch ? you may not have the neutral wire feed back to the plug to complete the elec circuit have come across this problem many times and the cause /fault is most probably the neutral wire has broken within the actual lead where/just b4 it enters the hand lever on the upright this area issubject to excessive bending/pulling of wire also kinking if you have a test screwdriver ? and a switched plug? you can check the neutral wire is completing curcuit back to plug with screwdriver tothe neutral pin of plug if no live ?and switch is on ? then you can either find break in wire or renew the cable with longer length to reach further without having to change sockets ? hope this helps?

Most of the time it’s a Fuse, PVH,(Pulse Vacuum Hublock) ,Vacuum line or Vacuum pump.
ESOF 4WD Trouble shooting It is easier to trouble shoot the system if you have a “Mityvac” vacuum pump. Turn the ignition switch to run (you don’t have to start the truck) and the air controls to vent and the fan control to low. If the truck’s vacuum pump comes on wait until it stops running before each test (open the hood and you’ll hear it better). First you need to remove both lines (left and right vacuum lines) from the hubs. Plug the passenger’s side line and attach the vacuum pump to the driver’s side line. Switch the dash controller to 4WD high. The vacuum gauge should go to 10 in.-Hg. or higher. (It should hold the vacuum at 10 in.-Hg. or higher for 45 seconds on engage and 15 seconds on disengage.) Repeat the test plugging the drivers side and testing the passengers side. If you have the right amount of steady vacuum the problem is probably in the hubs. If you do not have the right amount of vacuum or it is bleeding off, plug the lines back on the hubs and go to the next step. Second remove the vacuum lines from the PVH (Pulse Vacuum Hublock). This is the solenoid located on the passenger side fender well behind the battery and in front of the vacuum pump. Plug the vacuum tester into the lower hose and wait for the vacuum pump to build back up and shut off. The vacuum gauge should read and hold steady at 10 in.-Hg. or more. If it does, the vacuum reservoir should be fine and not leaking, so go on to the next step. Third, plug the bottom line back to the bottom of the solenoid and hook the vacuum gauge to the top barb of the solenoid (not the vacuum line but to the solenoid itself). Try switching between 2WD and 4WD again. The gauge should read 10 in.-Hg. for 45 seconds on engage and for 15 seconds on disengage. If it doesn’t it is probably the solenoid (PVH) on the fender that needs replacing. This was my problem so this was as far as I have gone. If all these things check out, THEN you need to go to the hubs and check them for leaks with the vacuum tester. Most of the time it’s a fuse, PVH, vacuum line or vacuum pump and not the hubs. Does your ac/heater work properly when you switch modes (IE linger before going in?) or sometimes stay on defrost? These trucks have a vacuum pump that controls it and the auto hubs.If the vacuum pump or hose,fails those are easy to see symptoms.


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its a problem with the power switch you can wire nut the wires together but I have been looking for parts myself.