04 Chev Epica, will not start, no 4 ways no turn signals, no pwr mirrors, windows or door locks? Checked fuses, possible computer problem?

Power windows don't use fuse's , has circuit breakers
• PWR WDO CB 25A (fuse block) (System power for left and right windows 2-door vehicles. System power for LF and LR windows 4-door vehicles)
• PWR WDO CB 25A (IP wiring harness junction block) (System power for RF and RR windows 4-door vehicles)

Door Lock System Components
The power door lock system consists of the following components:
• The driver door module (DDM)
• The passenger door module (PDM)
• The body control module (BCM)
• The driver information center (DIC)
• The rear door lock switch
• The door lock relay
• The door unlock relay
• The liftgate lock relay--utility vehicles with liftgate only
• The reversible door lock actuators in each of the doors and liftgate
• LOCKS 20A fuse (rear lock/unlock relay supply voltage)
• ECC 10A fuse (liftgate lock relay supply voltage)

7-BATT MAIN 1
60A
Fuses: •
CIGAR/DLC/APO FRT
• CLUSTER BATT
• CTSY LAMP
• ON STAR
• PWR LOCK
• PWR MIRROR
• RAP RELAY
• RR PWR SCKT

look below for above listed componet's , pull those fuse's one at a time till arc stop's ,then you found your problem circuit . Do you know where the I/P fuse box is ?
Fuse Block- I/P
Right side of the I/P, in the right front door opening


Fuse Block-I/P Label
Fuse Block-I/P Application Table Fuse/Circuit Breaker
Rating
Description
BCM PRGRM
10A
Body Control Module (BCM)
ENHANCED EVAP/AWD
15A
Evaporative Emission (EVAP) Canister Vent Solenoid, Clutch Pump Check Valve
CIGAR/DLC/APO FRT
20A
Auxiliary Power Outlet-Front, Cigar Lighter, Data Link Connector (DLC)
CLUSTER/BATT
10A
Instrument Panel Cluster (IPC)
CRUISE
10A
Cruise Control Module (CCM), Cruise Control Release Switch, Cruise Control ON/OFF Switch
CTSY LAMP
10A
Body Control Module (BCM)
DRL
10A
Daytime Running Lamps (DRL) Control Module
HVAC/DIC/DRL/HEATED SEAT
10A
Air Temperature Actuator-Left, Air Temperature Actuator-Right, Daytime Running Lamps (DRL) Control Module, Driver Information Center (DIC), Mode Actuator, Rear Window Wiper/Washer and Multifunction Switch (Heated Seat Switch), Recirculation Actuator, Relay Block (Rear Window Defogger Relay)
ELC/TRAILER
25A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Air Inflator Relay, Auto Level Control (ALC) Sensor
FRT HVAC HI BLWR
30A
Blower Motor Resistor Assembly
FRT WPR/WSHR
25A
Windshield Wiper Motor, Windshield Wiper/Washer Switch
HAZARD
15A
Turn Signal/Multifunction Switch
HEADLAMP
20A
Daytime Running Lamps (DRL) Control Module, Headlamp Dimmer Switch, Headlamp Switch
HTD MIRROR
10A
Outside Rearview Mirrors-Left, Right
HVAC/BLOWER
25A
HVAC Control Module
IGN1
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC), Left Rear Side Door Actuator Control Module, Rear Object Sensor Control Module, Right Rear Side Door Actuator Control Module, Stop Lamp Switch
LH HEADLP HIGH
10A
Headlamp High Beam-Left
LH HEADLP LOW
10A
Headlamp Low Beam-Left
LH T/LP
10A
Tail Lamp-Left, Trailer Rear Wiring Harness
MALL/CLUSTER
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC)
ON STAR
5A
Vehicle Interface Unit (VIU)
PASS KEY
10A
Theft Deterrent Control Module
PCM/ABS
10A
Electronic Brake Control Module (EBCM), Fuse Block-Underhood, Powertrain Control Module (PCM), Park/Neutral Position (PNP) Switch
PCM/CRANK
10A
Powertrain Control Module (PCM)
PCM/PASS KEY/CLUSTER
10A
Instrument Panel Cluster (IPC), Powertrain Control Module (PCM), Theft Deterrent Control Module, Instrument Panel Cluster (IPC), Powertrain Control Module (PCM)
PWR LOCK
20A
Body Control Module (BCM)
PWR MIRROR
10A
Outside Rearview Mirror Switch
PWR QTR VENT
10A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Sensor, Rear Quarter Window Switch
PWR/HEATED SEAT PSD
30A
Driver Seat Assembly, Passenger Seat Assembly
PWR SLDG DR
30A
Left Rear Side Door Actuator Control Module, Right Rear Side Door Actuator Control Module
PWR WDO
30A
Window Switch-Driver, Window Switch-Front Passenger
RAP RELAY
10A
Relay Block (RAP Relay)
RH HEADLP HIGH
10A
Headlamp High Beam-Right
RH HEADLP LOW
10A
Headlamp Low Beam-Right
RR HVAC/TEMP CONT
25A
Air Temperature Actuator-Auxiliary, Blower Motor-Auxiliary, Blower Motor Relay-Auxiliary, HVAC Control Assembly-Auxiliary, Mode Actuator-Auxiliary
RR DEFOG/ HTD MIRROR
30A
Window Defogger Relay-Rear
RR FOG LP
10A
Fog Lamp Relay-Rear
RR PWR SCKT
20A
Auxiliary Power Outlet-Rear
RH T/LP
10A
Tail Lamp-Right, Trailer Rear Wiring Harness
RR WPR/WSHR
20A
Window Wiper Motor-Rear, Rear Window Wiper/Washer and Multifunction Switch
SIR
15A
Inflatable Restraint Sensing and Diagnostic Module (SDM)
STOP LAMP
15A
Stop Lamp Switch
SWC BACKLIGHT
2A
Steering Wheel Controls-Left, Right
T/SIG
10A
Turn Signal Switch and Backup Lamp Relay

Beings as everything that stopped working is on the passenger side, I'd think some wiring got disconnected or broken.

These need to be checked:

Confirm the latest ignition switch is installed per TSB 04-08-45-005D.

2. Check the BCM PWR fuse.

3. If ok, check all of the door lock and unlock circuits for shorts to ground.

4. If ok, the Body Control Module (BCM) is defective.

when something inside a car door fails I already assume that one of the wires passing through the hinges that fold back and forth for years have eventually gotten pulled or broken. Usually it is the drivers door that has opened and closed more than the others. Since both the left and right mirror have controls in the drivers door it would be logical that if both failed at the same time that my hunch is confirmed.

The first thing to do would be to hook up a factory or professional type scan tool an check for DTC'S - diagnostic trouble code's . This vehicle has very complex electronic's. Serial data communication network,class2 data bus . There are electronic modules inside the door's that control the lock's ,power window's , power mirror's . Your best bet ,take it to a qualified repair shop . Not a fuse problem , driver an passenger door module each have thier own power supply. Two circuit breakers ,PWR/WDO circuit breaker 30 amp. You could check DRVMDL 10amp fuse ,located in the rear fuse box , PASSMDL 10amp fuse rear fuse box , RRDR/MDL 10 amp fuse rear fuse box . Rear fuse box is under the back seat . None of the window's , lock's etc.. work from any door switch ?

ck computer

check the wire harness at the door hinges

Ali, there is a recall for the drivers side door master switch. I believe 04' was included in the recall, regardless this problem affects ALL years of our platform. Water is able to penetrate the switch, say you open your door when it's raining out. Eventually the switch will start to melt out and can be a fire concern. 2 ways you can do this, call the dealer give them your vin # to see if 04 is included in the recall. OR pull one out of a wrecking yard, BUT, have the dealer on the phone when you do to give them the serial # off the master switch. Some of the newer TB's already had the problem fixed.

You checked the DRVMDL fuse in the rear fuse box ? The rear fuse box under the back seat. Also the PWR WDO circuit breaker in the rear fuse box.

Power Windows Inoperative - All
Step
Action
Value(s)
Yes
No
DEFINITION: All power windows inoperative from all door window switches.
1
Was the Power Door System Diagnostic System Check performed?
--
YES - Go to Step 2
NO - Go to Diagnostic System Check - Power Door Systems
2
Remove the PWR WDO circuit breaker.
Using a DMM, measure the resistance between circuit breaker terminals.
Is the resistance within the specified range?
0-5 ohms
YES - Go to Step 4
NO - Go to Step 3
3
Replace the PWR WDO circuit breaker.
YES - Is the replacement complete?
--
NO - Go to Diagnostic System Check - Power Door Systems
--
4
Using a DMM, measure the voltage between both rear junction block PWR WDO circuit breaker #57 terminals and ground.
Is the voltage within the specified range for either measurement?
10-15 V
YES - Go to Step 5
NO - Go to Power Distribution Schematics .
5
Repair CKT 1040 for an open or high resistance at rear junction block.
Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Diagnostic System Check - Power Door Systems