Need help!! I can't find the BCM on my 99 Tahoe
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Need help!! I can't find the BCM on my 99 Tahoe
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??
#5
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99 suv bcm pinouts
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
•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
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#12
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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
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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.
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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.
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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.