Body Control System: Overview Hummer H2 I

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Body Control Module (BCM) Terminal Identification - C1 Connector Part Information 12177194 6-Way F Metri-Pack 150 Series (WH) Pin Wire Color Circuit No. Function A RD 2353 Instrument Panel Lamps Dimming Supply Voltage B PU/WH 1382 LED Dimming Signal C OG 4040 Battery Positive Voltage D OG 1732 Inadvertent Power Courtesy Lamps Supply Voltage E BN/WH 230 Instrument Panel Lamps Dimming Control F OG 2240 Battery Positive Voltage

Body Control Module (BCM) Terminal Identification - C2 Connector Part Information 12110088 24-Way F Micro-Pack 100 Series (WH) Pin Wire Color Circuit No. Function A1 - - Not Used A2 D- BU 1796 Steering Wheel Radio Controls Supply Voltage A3 TN/BK 254 Rear Door Unlock Relay Control A4 PK/WH 1970 Headlamp Low Beam Relay Control A5 - - Not Used A6 GY/BK 255 Rear Door Lock Relay Control A7 - - Not Used A8 WH 193 Rear Defog Relay Control A9-A10 - - Not Used A11 RD/WH 812 12 Volt Reference A12 OG 1140 Battery Positive Voltage B1 BK/WH 1969 Headlamp High Beam Relay Control B2 WH 1080 Park Lamp Relay Control B3 D- BU 1353 RAP Supply Voltage B4 L- GN/BK 592 DRL Relay Control B5 PU 359 DRL Off Indicator Control B6 BK/WH 1851 Ground B7 BK 1835 Security System Sensor Low Reference B8 PK 1348 Headlamp On Indicator Control B9 BK 28 Horn Relay Control B10 WH 1309 Lateral Acceleration Input Signal B11 GY 1056 Dimmer Switch 5V Reference Voltage B12 L- GN 1037 BCM Class 2 Serial Data

Body Control Module (BCM) Terminal Identification - C3 Connector Part Information 12160778 24-Way F Micro-Pack 100 Series (BN) Pin Wire Color Circuit No. Function A1-A3 - - Not Used A4 WH 278 Ambient Light Sensor Signal A5 GY 1548 Passenger Sunload Sensor Signal A6 YE 1836 Security System Sensor Signal A7 L- GN 1011 Remote Radio Control Signal A8 D- GN 588 DRL Switch Signal A9 - - Not Used A10 D- GN 113 Windshield Wiper Switch Signal 2 A11 PU 328 Interior Lamp Defeat Switch Signal A12 - - Not Used B1 YE 710 Class 2 Serial Data B2 GY/BK 308 Park Lamp Switch Signal B3-B4 - - Not Used B5 L- BU/BK 590 Driver Sunload Sensor Signal B6 BK/WH 1851 Ground B7 - - Not Used B8 OG/BK 2090 Dimming Switch Signal B9 L- GN 11 Headlamp Dimmer Switch Signal B10 - - Not Used B11 L- BU 553 Tow/Haul Switch Signal B12 - - Not Used

Body Control Module (BCM) Terminal Identification - C4 Connector Part Information 12110206 24-Way F Micro-Pack 100 Series (L- BU) Pin Wire Color Circuit No. Function A1 L- GN 80 Key In Ignition Switch Signal A2 YE 307 Headlamp Switch Flash to Pass Signal A3 WH 530 Off/Run/Crank Voltage A4 PK 39 Ignition 1 Voltage A5-A6 - - Not Used A7 L- BU 1134 Park Brake Switch Signal A8 GY 1524 Backup Lamp Signal A9-A11 - - Not Used A12 WH 103 Headlamp Switch Headlamps On Signal B1-B2 - - Not Used B3 YE 43 Accessory Voltage B4-B5 - - Not Used B6 GY/BK 2226 Instrument Panel Lamps Dimmer Switch Low Reference B7 BK 279 Ambient Light Sensor Low Reference B8 - - Not Used B9 D- BU/WH 1495 Courtesy Lamps On Signal B10-B12 - - Not Used

Body Control Module (BCM) Terminal Identification - C5 Connector Part Information 12177195 6-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A-C - - Not Used D OG 2140 Battery Positive Voltage E GY/BK 690 Courtesy Lamp Control F L- GN 24 Backup Lamp Supply Voltage

Body Control Module (BCM) Terminal Identification - C6 Connector Part Information 12191375 16-Way F Micro-Pack 100 Series (PU) Pin Wire Color Circuit No. Function A1 PK/BK 1303 Liftgate Ajar Switch Signal A2 L- GN/BK 748 Right Rear Door Ajar Switch Signal A3 L- BU/BK 747 Left Rear Door Ajar Switch Signal A4 - - Not Used A5 L- BU 2265 Power Window Lockout Left Rear Control A6 L- GN 2266 Power Window Lockout Right Rear Control A7 GY/BK 1186 Power Window Relay Right Rear Up Control A8 D- GN 1188 Power Window Relay Right Rear Down Control B1 - - Not Used B2 WH 194 Rear Door Unlock Switch Signal B3 L- BU 195 Rear Door Lock Switch Signal B4-B6 - - Not Used B7 YE 1187 Power Window Relay Left Rear Down Control B8 WH 1185 Power Window Relay Left Rear Up Control

Begin the diagnosis of the body control system by performing the diagnostic system check for the system in which the customer concern is apparent. The diagnostic system check will direct you to the correct procedure for diagnosing the system and where the procedure is located.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 6: This step tests for battery voltage on the signal circuits that are not required.
2. 7: This step tests for no battery voltage on the required signal circuits.
3. 8: If any ignition switch parameters that should be inactive in the present ignition switch position are active, 2 ignition switch signal circuits may be shorted together.
4. 9: This step eliminates open circuits as the cause of the malfunction.

Power Mode Mismatch

Fail-safe Operation

Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the BCM fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.

See also:
• Master Electrical Component List
• Service Programming System (SPS)