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Retained Accessory Power System Buick LeSabre VIII

Accessories Control Systems 9 illustrations ~1344 words

Scheme 1

Scheme 1: RETAINED ACCESSORY POWER (RAP) SCHEMATICS
Scheme 1: RETAINED ACCESSORY POWER (RAP) SCHEMATICS

DIAGNOSTIC STARTING POINT - RETAINED ACCESSORY POWER

Begin the system diagnosis with the DIAGNOSTIC SYSTEM CHECK - RETAINED ACCESSORY POWER . The diagnostic system check will provide the following information

  1. The identification of the control modules which command the system
  2. The ability of the control modules to communicate through the serial data circuit
  3. The identification of any stored diagnostic trouble codes DTCs and their status

The use of the Diagnostic System Check will identify 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. 2 Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 3 This step tests for valid system power moding in all ignition switch positions.
  3. 5 The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3: SCAN TOOL OUTPUT CONTROLS
Scheme 3: SCAN TOOL OUTPUT CONTROLS

Scheme 4

Scheme 4: SCAN TOOL DATA LIST
Scheme 4: SCAN TOOL DATA LIST

Scheme 5

Scheme 5
Scheme 5

SCAN TOOL DATA DEFINITIONS

  1. 8-Digit GM Part Number The scan tool displays an 8-digit alphanumeric number. This is the modules part number.
  2. Battery Voltage The scan tool displays 0-30 Volts. The voltage measured between the module's battery positive voltage circuit and ground circuit.
  3. Calibration ID The scan tool displays a 4-digit alphanumeric number. This number designates the modules calibrations.
  4. Driver Door Jamb Sw. The scan tool displays On/Off. Display indicates the state of the driver door jamb switch. On indicates the door is open and Off indicates the door is closed.
  5. Ign. Accessory The scan tool displays Active/Inactive. The scan tool displays Active when only the Accessory and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch.
  6. Ignition Crank/Run The scan tool displays Active/Inactive. The scan tool displays Active when the Crank/Run and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch.
  7. Ign. Run The scan tool displays Active/Inactive. The scan tool displays Active when the Run, Accessory, Run/Crank and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch.
  8. Ignition Switch The scan tool displays Accy./Crank/Off/RAP/RAP-Unlock/Run/Unlock. The scan tool displays Accy. when the accessory and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Crank when the Crank/Run, and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Off when none of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays RAP when RAP is active and none of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays RAP-Unlock when RAP is active and the Ign. Unlock circuit of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Run when all of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays Unlock when the Unlock circuit of the DIM receives a battery voltage signal from the ignition switch.
  9. Ign. Unlock The scan tool displays Active/Inactive. The scan tool displays Active when only the Unlock circuit of the DIM receives a battery voltage signal from the ignition switch.
  10. Julian Date of Build The scan tool displays 3-digit numeric number. This is the day of the year that the module was built.
  11. Pass. Door Jamb Sw. The scan tool displays On/Off. Display indicates the state of the passenger door jamb switch. On indicates the door is open and Off indicates the door is closed.
  12. PROM ID The scan tool displays a 4-digit alphanumeric number. This is modules internal PROM identification number.
  13. RAP Output The scan tool displays On/Off. Display indicates the status of the RAP function.

SYMPTOMS - RETAINED ACCESSORY POWER

Note. Review the system operation in order to familiarize yourself with the system functions. Refer to RETAINED ACCESSORY POWER (RAP) DESCRIPTION & OPERATION .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the RAP feature. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/accessories-control-systems/#retained-accessory-power-system__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «RETAINED ACCESSORY POWER (RAP) ON AFTER TIME-OUT»(/buick/lesabre/viii-2000-2005/remont/accessories-control-systems/#retained-accessory-power-system)
  2. «RETAINED ACCESSORY POWER (RAP) INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/accessories-control-systems/#retained-accessory-power-system)

CHECKING AFTERMARKET ACCESSORIES

Do not connect aftermarket accessories into the following circuits

  1. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
  2. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

  1. Power feeds connected to points other than the battery.
  2. Antenna location.
  3. Transceiver wiring located too close to vehicle electronic modules or wiring.
  4. Poor shielding or poor connectors on antenna feed line.
  5. Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

Scheme 6

Scheme 6: RETAINED ACCESSORY POWER (RAP) ON AFTER TIME-OUT
Scheme 6: RETAINED ACCESSORY POWER (RAP) ON AFTER TIME-OUT

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8: RETAINED ACCESSORY POWER (RAP) INOPERATIVE
Scheme 8: RETAINED ACCESSORY POWER (RAP) INOPERATIVE

Scheme 9

Scheme 9
Scheme 9

Serial Data Control Of Retained Accessory Power (RAP)

Retained Accessory Power (RAP) is a vehicle power mode that permits the operation of selected customer convenience items after the ignition switch is turned OFF. These selected items will remain in operation until a passenger compartment door is opened or until the RAP function timer reaches its shut-off limit.

The modules listed below all receive a RAP message from the Dash Integration Module (DIM) module over the serial data circuits. The DIM module monitors the ignition switch position, battery condition and passenger compartment door status to determine whether RAP should be initiated. The DIM module then sends a message to the listed modules telling them that they are in RAP power mode. The modules then support the operation of the systems under their control as required by their RAP power mode strategy.

RAP will end when one of the following conditions are met

  1. The DIM module receives an input as a serial data message from the Driver Door Module (DDM) indicating the opening of a passenger compartment door.
  2. The DIM module receives a message from its internal timer indicating the end of the RAP period after 10 minutes.
  3. The DIM module detects a decrease in battery capacity below a prescribed limit.
  4. The transition from OFF to RUN/ON or ACC of the ignition switch.

The DIM module then sends a serial data message to the listed modules ending the RAP function.

The modules receiving serial data messages for RAP functions are

  1. The Driver Door Module (DDM).
  2. The radio.
  3. The Rear Integration Module (RIM).
  4. The Vehicle Communication Interface Module (VCIM) - Generation F1.
  5. The Vehicle Interface Unit (VIU) - Generation 2.6.

Relay Control Of Retained Accessory Power (RAP)

Retained Accessory Power (RAP) is a vehicle power mode that permits the operation of selected customer convenience items after the ignition switch is turned OFF. These selected items will remain in operation until a passenger compartment door is opened or until the RAP function timer reaches its shut-off limit.

When the RIM module is in the RAP function as described above, it closes the RAP relay. This provides power during the RAP period for the components supplied by the RAP relay.

The RIM module opens the RAP relay to end the RAP function when it ends the RAP function as outlined in the previous text.

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