GM Service Manual Online
For 1990-2009 cars only
Connector 1: BCM X1
Connector 2: BCM X2
Connector 3: BCM X3
Connector 4: BCM X4
Connector 5: BCM X5
Connector 6: BCM X6
Connector 7: BCM X7
Connector 8: Data Link Connector
Connector 9: Resistor

BCM X1


Object Number: 1664499  Size: CH

Connector Part Information

  • OEM: JST HITPB-25-D-K
  • Service: N/A
  • Description: 25-Way F 064+280 Unsealed

BCM X1

Pin

Wire Color

Circuit No.

Function

1

RD/WH

--

Battery Positive Voltage

2

RD/WH

--

Battery Positive Voltage

3

RD/WH

--

Battery Positive Voltage

4

RD/WH

--

Battery Positive Voltage

5

D-BU/WH

--

Right Front Turn Signal Lamp Supply Volt

6

--

--

Not Used

7

YE

--

Wiper Motor Park Switch Signal

8-10

--

--

Not Used

11

D-GN/WH

--

Fog Lamp Relay Control

12

OG

--

Left Trailer Turn Signal Lamp

13

YE

--

Right Trailer Turn Signal Lamp

14

L-GN

--

Rain Sensor Signal

15

OG

--

Windshield Washer Relay Control

16

BN/WH

--

HDLP High Beam Relay Control

17

--

--

Not Used

18

BN

--

Rain Sensor Signal

19

D-BU

--

Accessory Wakeup Serial Data

20

YE

--

Rear Fog Lamp Relay Control

21

YE

--

Run/Crank Relay Coil Control

22-23

--

--

Not Used

24

WH

--

Headlamp Washer Relay Control

25

--

--

Not Used

BCM X2


Object Number: 1664500  Size: CH

Connector Part Information

  • OEM: JST HITPB-25-E-N
  • Service: N/A
  • Description: 25-Way F 064+280 Unsealed

BCM X2

Pin

Wire Color

Circuit No.

Function

1

YE

--

Left Rear Stop/Turn Lamp Supply Voltage

2

D-GN

--

RR Stop/Turn Lamp Supply Voltage

3

--

--

Not Used

4

L-BU/WH

--

Left Front T/Signal Lamp Supply Voltage

5

--

--

Not Used

6

BN

--

Rear Defog Indicator Supply Voltage

7-10

--

--

Not Used

11

BN

--

RAP Relay Coil Control

12

--

--

Not Used

13

L-GN

--

Run Relay Coil Control

14

BN

--

Accessory Voltage

15

PU

--

Hood Closed Switch Signal

16

L-BU

--

Park Brake Switch Signal

17

--

--

Not Used

18

BN

--

Horn Relay Control

19

WH

--

Rear Defog Relay Control

20

GY

--

Wiper Motor Relay Coil Supply Voltage

21

BN

--

F/Windshield Wiper Switch High Signal

22

--

--

Not Used

23

PK/WH

--

HLDP Low Beam Relay Control

24

D-BU

--

Park Lamp Relay Control

25

--

--

Not Used

BCM X3


Object Number: 1664502  Size: CH

Connector Part Information

  • OEM: JST HITPB-25-F-PK
  • Service: N/A
  • Description: 25-Way F 064+280 Unsealed

BCM X3

Pin

Wire Color

Circuit No.

Function

1

GY/BK

--

Courtesy Lamp Relay Control

2

L-GN

--

Backup Lamp Supply Voltage

3-7

--

--

Not Used

8

BN/WH

--

Right Front Door Ajar Switch Signal

9

--

--

Not Used

10

GY/BK

--

Left Front Door Ajar Switch Signal

11

GY

--

EVAP Core Temp Sensor Signal

12

PK/BK

--

Lift Gate Ajar Switch Signal 1

13-15

--

--

Not Used

16

PU

--

Intrusion Arm On Signal

17-19

--

--

Not Used

20

PU

--

Door Lock Key Switch Unlock Signal

21

YE

--

Backuplight Lamp Control

22

L-GN

--

Door Lock Key Switch Lock Signal

23

BN

--

Trunk Key Switch Signal

24-25

--

--

Not Used

BCM X4


Object Number: 1664505  Size: CH

Connector Part Information

  • OEM: JST HITPB-28-G-H
  • Service: N/A
  • Description: 28-Way F 064+280 Unsealed

BCM X4

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

PK

--

L/Glass/Trunk Exterior Release Control

3-6

--

--

Not Used

7

L-GN

--

Left Front Door Lock Relay Control

8

OG

--

Rear Wiper Auto On Signal

9

PK/BK

--

Driver Door Unlock Relay

10

BN

--

Exhaust Gas Recir Temperature Sensor Low Reference

11

OG/BK

--

Engine Main Relay Fused Control

12

OG/BK

--

Driver Door Lock Switch Lock Signal

13-14

--

--

Not Used

15

D-GN

--

Alarm Armed Signal

16

L-BU

--

Rear Fog Lamp Switch Signal

17-22

--

--

Not Used

23

BN

--

Left Front Door Open Switch Signal

24

D-GN/WH

--

A/C Request Signal

25-28

--

--

Not Used

BCM X5


Object Number: 1664495  Size: CH

Connector Part Information

  • OEM: HITPB-27-A-LM
  • Service: N/A
  • Description: 27-Way F HIT Series Unsealed (L-GN)

BCM X5

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

WH/BK

--

Ignition Key Resister Signal

3

GY

--

Cruise Control Switch Signal

4

WH

--

Off/Run/Crank Voltage

5

L-GN

--

Windshield Wiper Switch High Signal

6-7

--

--

Not Used

8

BN/BK

--

Windshield Wiper Switch Low Reference

9

L-BU

--

Windshield Wiper Switch Low Signal

10-13

--

--

Not Used

14

PK

--

Run/Crank Ignition 1 Voltage

15

L-BU/WH

--

Left Front Turn Switch Signal

16

D-BU/WH

--

Right Front Turn Switch Signal

17

PK

--

12-Voltage Reference

18

PU

--

HDLP Dimmer Switch High Beam

19

BN

--

Hazard Switch Signal

20

D-GN

--

Tap Up/Down Enable Signal

21

YE

--

Accessory Voltage

22

--

--

Not Used

23

L-BU

--

Shift Select Switch Perform Signal

24

PK

--

Windshield Washer Switch Signal

25

YE

--

HDLP Switch Flash To Pass Signal

26

BN/WH

--

BTSI Solenoid Control

27

--

--

Not Used

BCM X6


Object Number: 1664496  Size: CH

Connector Part Information

  • OEM: JST HITPB-25-B-5
  • Service: N/A
  • Description: 25-Way F Unsealed

BCM X6

Pin

Wire Color

Circuit No.

Function

1

OG

--

Electronic Control Unit 12-Volt Reference 3

2

RD/WH

--

Battery Positive Voltage

3

BN/WH

--

I/P Lamp Dimming Control

4-7

--

--

Not Used

8

L-BU

--

HDLP Switch Park Lamp Signal

9

--

--

Not Used

10

D-BU

--

Lift Glass/Trunk Release Signal

11

WH

--

Ambient Light Sensor Signal

12

WH

--

Headlamp Switch On Signal

13-16

--

--

Not Used

17

D-GN

--

HDLP Switch Off Signal Control

18

PK

--

Intrusion Sensor Switch Disable

19

--

--

Not Used

20

L-BU

--

Rear Defog Switch Signal

21

L-BU

--

Traction Control Switch Signal (1)

22-24

--

--

Not Used

25

PU

--

Interior Lamp Defeat Switch Signal

BCM X7


Object Number: 1664498  Size: CH

Connector Part Information

  • OEM: JST HITPB-25-C-LE
  • Service: N/A
  • Description: 25-Way F 064+280 Unsealed

BCM X7

Pin

Wire Color

Circuit No.

Function

1

BK

--

Ground

2

RD/WH

--

Battery Positive Voltage

3

RD/WH

--

Battery Positive Voltage

4

--

--

Not Used

5

BK

--

Ground

6

--

--

Not Used

7

YE

--

Security Indicator Control

8

BN/BK

--

High Speed GMLAN Serial Data (+)

9

BN

--

High Speed GMLAN Serial Data (-)

10

D-GN

--

Low Speed GMLAN Serial Data

11

D-GN

--

I/P Lamp Dimmer Switch Signal

12

OG/WH

--

12-Voltage Reference

13

PU

--

Brake Pedal Switch Normally Closed Contact Signal

14

BN

--

EVAP Core Temp Sensor Low Reference

15

--

--

Not Used

16

BN/BK

--

High Speed GMLAN Serial Data (+)

17

BN

--

High Speed GMLAN Serial Data (-)

18

YE

--

Backlight Lamp Control

19

L-BU

--

Serial Data Communication Enable

20

--

--

Not Used

21

OG

--

Front Fog Lamp Switch Signal

22-24

--

--

Not Used

25

PU/WH

--

LED Dimming Signal

Data Link Connector


Object Number: 1468419  Size: CH

Connector Part Information

  • OEM: MOLEX 51115-1611
  • Service: N/A
  • Description: 16-Way F OBD II Unsealed

Data Link Connector

Pin

Wire Color

Circuit No.

Function

1

D-GN

--

Low Speed GMLAN Serial Data

2-3

--

--

Not Used

4

BK

--

Ground

5

BK/WH

--

Signal Ground

6

BN/BK

--

High Speed GMLAN Serial Data (+)

7

PU

--

Engine/Radio Serial Data K Line

8

WH

--

Central Control Module Diagnosis Enable

9-13

--

--

Not Used

14

BN

--

High Speed GMLAN Serial Data (-)

15

--

--

Not Used

16

RD/WH

--

Battery Positive Voltage

Resistor


Object Number: 523630  Size: CH

Connector Part Information

  • OEM: PED 15326801
  • Service: N/A
  • Description: 2-Way F GT 150 Sealed

Resistor

Pin

Wire Color

Circuit No.

Function

1

BN/BK

--

High Speed GMLAN Serial Data (+) 1

2

BN

--

High Speed GMLAN Serial Data (-) 1