will not start, no spark, no fuel pressure, no gauges

[nighttowl]

I have an 02 silverado with a 4.8 auto 2wd.  Ive only had it a couple weeks, but ran good.  last weekend I put a turn signal switch in it, and while I was in there I removed a added on car alarm that did not have any controls.  after i changed the switch and removed the alarm, the truck will not run.

i have no spark, and no fuel pressure.  the gauges seemed to have stopped working as well.

there are not any error codes.  i was able to connect with the ECM with HP tuners; so I do not believe its the ECM and there is no security light on the dash either.

The car alarm was tied into the body control module for door locks, and for the ignition it was tied into the yellow wire that goes from the ignition to the fuse box.

i removed the tie ins for the door locks, and soldered together the yellow wire.

i pulled every fuse and they are all good.

 

is the body control module toast?

is there a way to check it?  this one has 3 connectors on it.

I tried looking online for a pinout for the bcm and i did not find anything at all which i thought was odd.

 

can i just put in another one, or do I need to have it towed to a dealer?

[carnau]

Make sure the connector under the steering column where the lock has to pull it down is all the way connected. It happens a lot that it's not all the way seated. I can give you all the schematics and pinouts but I am at my families house for thanksgiving and this computer will not let me open the site. Soon as I get home I will take care of it.

 

 

[nighttowl]

Would be appreciated,  i havent found anything yet.

[carnau]

Going to have to do this in several posts because of the terminals. Sorry.

[carnau]

A1	BLK	1850	Ground
A2	ORN	1140	Battery Positive Voltage
A3	WHT	194	Door Unlock Control
A4	LT BLU	195	Door Lock Control
A5	BRN	1295	Variable Effort Steering Actuator Control
A6	—	—	Not Used
A7	BLK	755	RAP Relay Coil Control
A8	DK BLU	1393	Inadvertent Power Relay Control
A9	BLK	28	Horn Relay Control
A10	—	—	Not Used
A11	LT GRN/ BLK	592	DRL Relay Control
A12	LT GRN	1037	BCM Class 2 Serial Data
B1	BLK	1850	Ground
B2	PNK	39	Ignition 1 Voltage
B3	RED/WHT	812	12 Volt Reference
B4	ORN	461	GMCM Serial Data
B5	GRY	705	5 Volt Reference
B6	LT BLU	14	Left Turn Signal Lamps Supply Voltage
B7	DK BLU	15	Right Turn Signal Lamps Supply Voltage
B9	BRN	41	Ignition 3 Voltage
B10	LT BLU	1134	Park Brake Switch Signal
B11	BLK/WHT	238	Seatbelt Switch - Left
B12	LT BLU	553	Tow/Haul Switch Signal

[carnau]

A1	YEL	710	Class 2 Serial Data
A2	ORN/BLK	1057	Low Reference
A3	GRY/BLK	690	Courtesy Lamp Relay Control
A4	LT GRN	1391	Left Front Door Lock Relay Control
A5	WHT	1080	Park Lamp Relay Control
A6	—	—	Not Used
A7	DK GRN/ WHT	1317	Fog Lamp Relay Control
A8	DK GRN	1655	Exterior Courtesy Lamps Relay Control
A9–A10	—	—	Not Used
A11	WHT	352	Headlamp Relay Coil Supply Voltage
A12	PPL/WHT	1382	LED Dimming Signal
B1	DK GRN/ WHT	817	Vehicle Speed Signal
B2	—	—	Not Used
B3	YEL	1836	Security System Sensor Signal
B4	—	—	Not Used
B5	PPL	524	High Beam Signal
B6	BRN	2409	Interior Parklamps Supply Voltage
B7–B8	—	—	Not Used
B9	LT GRN	80	Key In Ignition Switch Signal
B10	PNK/BLK	1303	RAP Fuse Supply Voltage
B11	DK BLU/ WHT	727	Secondary Door Latch Switch Signal
B12	ORN	1732	Courtesy Lamp Supply Voltage

[carnau]

A1	DK BLU/ WHT	149	Cargo Lamp Switch Input
A2	DK BLU/ WHT	1495	Interior Lamp Control
A3	BRN	1356	Flash to Pass Switch Signal
A4	GRY	705	5 Volt Reference
A5	GRY	8	Instrument Panel Lamp Supply Voltage
A6	WHT	278	Ambient Light Sensor Signal
A7–A8	—	—	Not Used
B1	—	—	Not Used
B2	ORN	54	Right Front Door Open Switch Signal (-C68)
B3	LT GRN	262	Driver Door Key Switch Signal
B4	TAN	126	Left Front Door Open Switch Signal
B5	ORN	192	Front Foglamp Switch Signal
B6	PPL	328	Interior Lamp Defeat Switch Signal
B8	—	—	Not Used

[carnau]

Ok. Now that all that is over lol. Do you have access to a scanner you can tell communication from?

[nighttowl]

all i have is HP tuners and the typical obd2 scanners, and both digital / anolog multi-testers.

[nighttowl]

I didnt get anywhere with it; had it dropped off at the stealership.

hopefully they can figure it out.

[carnau]

Awww. I probably could have walked you through it =-(

[nighttowl]

Dealer found the problem - the passenger side fuse box had a short in it, 3 circuits were not getting power.

Good to go now.

[carnau]

18 minutes ago, nighttowl said:

Dealer found the problem - the passenger side fuse box had a short in it, 3 circuits were not getting power.

Good to go now.

Glad you got it fixed!