Bad Scuba

I need help y'all I can't find the BCM on my 99 Tahoe. I just did an engine swap and installed a 01 5.3 with the complete wiring harness and PCM. I have a wire on there that shows it going to C2 #1 pinout, a yellow wire but I can't find the BCM or where the old PCM attached to it. Can anybody help me with this??

Bad Scuba

Somebody?? Anybody??

62n62

iTrader: (17)

Body Control Module (BCM) (Luxury)
In the center floor console

62n62

iTrader: (17)

looks like si2000 (gm service) only show a luxury suv to have a bcm

62n62

iTrader: (17)

Connector Part Information
•12110207
•32F MIC/P 100 (BLU)

Pin
Wire Color
Circuit No.
Function

C1
BLK
150
Ground

C2–C3
—
—
Not Used

C4
Yel
234
Seat Belt Indicator Lamp Output

C5–C7
—
—
Not Used

C8
BLK/WHT
624
Vehicle Anti-Theft System signal - Headlamp Alarm

C9
BLK
28
Horn Relay Output - Coil

C10-C12
—
—
Not Used

C13
BLK/WHT
238
Seat Belt Switch Signal

C14
LT GRN
80
Key Reminder Switch Signal

C15
—
—
Not Used

C16
DK GRN
1376
Security Signal - Alarm Armed

D1
GRA
157
Interior Lamp Output

D2
KT BLU
263
Tamper Switch Signal

D3
—
—
Not Used

D4
BRN
253
Liftgate Release Relay Feed - Coil

D5
PNK
39
Liftgate Release - Ignition 3 Type III Fuse

D6
YEL
43
Fuse Output Accessory Type III Fuse

D7–D10
—
—
Not Used

D11
TAN
159
Key Reminder Switch Output

D12
PPL
328
Interior Lamp Defeat Switch Output

D13
ORN
1897
Door Ajar Switch Signal - Right

D14
LT GRN
1828
Security Signal - Shock Sensor

D15
BRN
9
Park Lamp Feed

D16
—
—
Not Used


BCM Module C2


Connector Part Information
•12064752
•6F M/P 280 Series (BLK)

Pin
Wire Color
Circuit No.
Function

A
BLK
150
Ground

B
DK BLU/WHT
149
Battery Positive Voltage

C
DK BLU
75
Delayed Accessory Bus Relay Output

D
BRN
4
Ignition Switch Output - Accessory

E
ORN
40
Courtesy Lamp Feed

F
RED
342
Fuse Ouput - Battery - Type III Fuse


BCM Module C3


Connector Part Information
•12089527
•6F (GRN)

Pin
Wire Color
Circuit No.
Function

A
TAN
694
Power Door Lock Motor Feed - Driver Power Door Switch Lock on Lock

B
RED/BLK
680
Power Door Lock Switch - Output Switch - Lock Passenger

C
LT BLU
244
Power Door Lock Switch - Output Switch - Lock Passenger Switch

D
DK BRN
245
Power Door Lock Switch - Output Switch - Unlock Passenger Switch

E
ORN/BLK
781
Power Door Lock Switch - Output Driver Switch - Unlock

F
—
—
Not Used

62n62

iTrader: (17)

what pin does the yel wire come out of the ecm/pcmthet goes to the bcm

Bad Scuba

I looked there, behind the glove box and behind the knee panel. Could it be in the back behind one of them panels?

Bad Scuba

Blue C1-59 I'm wondering if it even has a BCM??

Bad Scuba

It shows it coming from the blue C1-59 pin on the PCM and going to the C2-A1 connector on the BCM. It also shows them sharing the Serial Data OBD2 plug under the dash on a another wire.

62n62

iTrader: (17)

59
YEL
710
Class 2 Serial Data

62n62

iTrader: (17)

Bad Scuba

Yep that's the one. I did some research and found out that it's suppose to go to the BCM but it's looking like I don't even have a BCM. The Tahoe is fully loaded except for leather. Everything is elec and it even has rear air. But I'll be damned if I can find a BCM

bczee

iTrader: (12)

Generally it is in the passenger kick panel or behind the Glove box or near the HVAC box.

I also have a 99 Tahoe... but never looked for it and don't have the FSM..

BC

Bad Scuba

I haven't looked there yet. But I'm fixin to. Thanks! There's no room for it behind the glove box I checked there.

Bad Scuba

Ok I looked behind the kick panel even though it looks like there's not enough room behind it and there's not. That thing has a blower motor under there the size of a basket ball and it sets real close to the kick panel!! I don't where else to look.

Bad Scuba

I guess this damn thing doesn't have a BCM! I find that strange though. I was going to try and see if it would except the newer 01 PCM and take care of the VATS for me. The thing starts but then the injectors quit pulsing and it dies. The only thing I can figure is it needs that BCM to tell it to pulse the injectors. Oh well looks like I'm going to have to remove VATS from the PCM. Waiting on a cord to go from my laptop to the OBD2 connector so I can flash it. I also have that iobd2 for my iphone but there doesn't seem to be any tuning software for it just diagnostic software.