Home ReviewsRefund
Home/Oldsmobile/Bravada/Oldsmobile Bravada III (2001-2004)/Repair manual/Communication Devices/Body Control System: Overview
Contents Wiring diagrams Section: Communication Devices All sections

Body Control System: Overview Oldsmobile Bravada III

Communication Devices 5 illustrations ~843 words

Scheme 1

Scheme 1: Body Control System Schematics
Scheme 1: Body Control System Schematics

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5: Body Control System Component Views
Scheme 5: Body Control System Component Views
CalloutComponent Name
1Body Control Module (BCM)
2Fuse Block-Rear
3Body Control Module Connectors C1 and C2

Body Control Module (BCM) Connector End C1 Connector Part Information 12110088 24-Way F Micro-Pack 100 Series (LT GRY) Pin Wire Color Circuit No. Function A1 - - Not Used A2 WHT 2282 Headlamp Washer Relay Control (w/CE4) A3 ORN 1140 Battery Positive Voltage A4 BLK/WHT 1969 Headlamp High Beam Relay Control A5 PNK/WHT 1970 Headlamp Low Beam Relay Control A6-A11 - - Not Used A12 WHT 278 Ambient Light Sensor Signal B1 LT GRN 1037 BCM Class 2 Serial Data B2 BLK 279 Ambient Light Sensor Low Reference B3 LT GRN 2270 Rear Window Washer Relay Control B4 GRY/BLK 2226 Low Reference B5 GRY 705 5 Volt Reference B6 WHT 2283 Rear Wiper/Washer Switch Supply Voltage B7 ORN/BLK 2090 Courtesy Lamps Supply Voltage B8 LT GRN 1011 Remote Radio Control Signal B9 GRY 391 Rear Window Wiper Switch Signal B10 YEL 1836 Security System Sensor Signal B11 GRY 2521 Right Sunload Sensor Signal B12 LT BLU/BLK 2519 Left Sunload Sensor Signal

Body Control Module (BCM) Connector End C2 Connector Part Information 12110112 32-Way F Micro-Pack 100 (TAN) Pin Wire Color Circuit No. Function E1-E2 - - Not Used E3 LT GRN 80 Key In Ignition Switch Signal E4 YEL 307 Headlamp Switch Flash to Pass Signal E5 GRY/BLK 308 Park Lamp Switch Signal E6 PNK/BLK 109 Hood Ajar Switch Signal (Export Only) E7 PNK 1348 Headlamp On Indicator Control E8 BLK 1835 Security System Sensor Low Reference E9 RED/WHT 812 12 Volt Reference E10 - - Not Used E11 DK GRN/ WHT 1317 Fog Lamp Relay Control E12 BLK 28 Horn Relay Control E13-E16 - - Not Used F1-F2 - - Not Used F3 DK GRN 113 Windshield Wiper Switch Signal 2 F4 DK BLU/ WHT 1495 Courtesy Lamps On Signal F5 BRN/WHT 1871 Headlamp Washer Switch Signal (w/CE4) F6 ORN 192 Front Fog Lamp Switch Signal F7 LT BLU 187 Rear Fog Lamp Switch Signal F8 - - Not Used F9 WHT 103 Headlamp Switch Headlamps On Signal F10 LT GRN 11 Headlamp High Beam Supply Voltage F11 PPL 328 Interior Lamp Defeat Switch Signal F12-F13 - - Not Used F14 YEL 710 Class 2 Serial Data F15-F16 - - Not Used

Body Control Module (BCM) Connector End C3 Connector Part Information 15077187 40-Way Flat Wire Pin Wire Color Circuit No. Function A1 - - Battery Positive Voltage A2 - - Not Used A3 - - Right Rear Door Ajar Switch Signal A4 - - Park Brake Switch Signal A5 - - Door Lock Relay Control A6 - - Power Window Lockout Left Rear Control A7 - - Not Used A8 - - Left Rear Door Ajar Switch Signal A9-A10 - - Not Used A11 - - Ground A12 - - RAP Relay Supply Voltage A13 - - Door Unlock Relay Control A14 - - Park Lamp Relay Control A15-A17 - - Not Used A18 - - Ignition 0 Voltage A19 - - Battery Positive Voltage A20 - - Ignition 3 Voltage B1 - - Instrument Panel Lamps Dimming Control B2 - - Instrument Panel Lamps Dimming Control B3 - - Courtesy Lamp Supply Voltage B4 - - Battery Positive Voltage B5 - - Power Window Switch Right Rear Up Signal B6 - - Power Window Lockout Right Rear Control B7 - - Power Window Switch Right Rear Down Signal B8 - - Power Window Switch Left Rear Up Signal B9 - - Power Window Switch Left Rear Down Signal B10 - - Not Used B11 - - Ground B12 - - Backup Lamp Supply Voltage B13 - - Battery Positive Voltage B14 - - LED Dimming Supply B15 - - Accessory Voltage B16 - - Not Used B17 - - Battery Positive Voltage B18 - - Courtesy Lamps Supply Voltage B19 - - Rear Fog Lamp Relay and Indicator Control B20 - - Not Used

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.
StepActionYesNo
Schematic Reference: Body Control System Schematics Connector End View Reference: Body Control System Connector End Views DEFINITION: This table is used if the observed vehicle power mode does not match the ignition switch position. IMPORTANT: Open the driver door and leave it open during this test. This will disable the RAP power mode and eliminate this power mode from the power mode parameter list.
1Install a scan tool. Turn OFF the ignition. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position?Go to Step 2Go to Step 6
2Turn the ignition switch to the UNLOCK position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position?Go to Step 3Go to Step 6
3Turn ON the ignition, with the engine OFF. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position?Go to Step 4Go to Step 6
4IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Turn the ignition switch to the CRANK position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position?Go to Step 5Go to Step 6
5Turn the ignition switch to the ACCY position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position?Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring SystemsGo to Step 6
6IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Turn OFF the ignition. Disconnect the PMM. Hold the ignition switch in the position that indicated the incorrect power mode. With a test lamp attached to a good ground, test the PMM ignition switch inputs for voltage. Refer to Body Control System Description and Operation. Is voltage present on only the inputs specified for the ignition switch position?Go to Step 7Go to Step 8
7IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Hold the ignition switch in the position that indicated the incorrect power mode. With a test lamp attached to a good ground, test the PMM ignition switch inputs for voltage. Refer to Body Control System Description and Operation. Is voltage not present on any inputs specified for the ignition switch position?Go to Step 9Go to Step 11
8Disconnect the ignition switch. Test the PMM ignition switch input circuits for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Test the PMM ignition switch circuits for a short between circuits. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?Go to Step 14Go to Step 10
9Disconnect the ignition switch. Test the PMM ignition switch input circuits for an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?Go to Step 14Go to Step 10
10Inspect for poor connections and terminal tension at the harness connector of the ignition switch. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?Go to Step 14Go to Step 12
11Inspect for poor connections and terminal tension at the harness connector of the PMM. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?Go to Step 14Go to Step 13
12Replace the ignition switch. Refer to IGNITION SWITCH in Steering Wheel and Column. Did you complete the replacement?Go to Step 14
13IMPORTANT: After replacement of the PMM perform the programming or set up procedure if required. Replace the PMM. Refer to Control Module References.Did you complete the replacement?Go to Step 14
14IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying all power modes. Reconnect all disconnected components. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Cycle the ignition switch through all possible positions one at a time. Does the displayed power mode parameter match the actual ignition switch position?System OKGo to Step 1
IMPORTANT
Open the driver door and leave it open during this test. This will disable the RAP power mode and eliminate this power mode from the power mode parameter list.
IMPORTANT
The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
IMPORTANT
The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
IMPORTANT
The engine may start during this procedure. Turn the ignition OFF after verifying this power mode.
IMPORTANT
After replacement of the PMM perform the programming or set up procedure if required.
IMPORTANT
The engine may start during this procedure. Turn the ignition OFF after verifying all power modes.

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.

More articles — Body Control System