Important Preliminary Checks Before Starting
- Perform the «Diagnostic System Check - Retained Accessory Power»(ref-187816-S34816211582005090100000) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
- Review the system operation in order to familiarize yourself with the system functions. Refer to «Retained Accessory Power (RAP) Description and Operation»(ref-187816-S20001967482005090100000) .
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Retained Accessory Power (RAP) On After Timeout
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Body Control System Schematics in Body Control System Connector End View Reference: Body Control System Connector End Views in Body Control System | |||
| 1 | Did you perform the Diagnostic System Check - Retained Accessory Power (RAP)? | Go to Step 2 | Go to Diagnostic System Check - Retained Accessory Power |
| 2 | Close the vehicle doors. Turn the ignition to the RUN position. Turn the ignition to the OFF position. Wait at least 10 minutes. Do all of the RAP functions still operate after the 10 minute time-out period? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 | Observe the power mode with a scan tool. Is the power mode RAP after the 10 minutes? | Go to Step 4 | Go to Diagnostic System Check - Entertainment System in Entertainment |
| 4 | Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 5 | |
| 5 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Retained Accessory Power (RAP) On After Timeout
Retained Accessory Power (RAP) Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Body Control System Schematics in Body Control System Connector End View Reference: Body Control System Connector End Views in Body Control System | |||
| 1 | Did you perform the Diagnostic System Check - Retained Accessory Power (RAP)? | Go to Step 2 | Go to Diagnostic System Check - Retained Accessory Power |
| 2 | Close the driver and passenger doors. Turn the ignition ON, with the engine OFF. Turn the ignition OFF. Do the RAP functions operate for approximately 10 minutes? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Observe the power mode with a scan tool. Turn ON the ignition, with the engine OFF. Turn OFF the ignition. Is the power mode RAP for approximately 10 minutes? | Go to Diagnostic System Check - Entertainment System in Entertainment. | Go to Step 4 |
| 4 | Observe the door switches with a scan tool. Does the scan tool indicate that the doors are closed? | Go to Step 5 | Go to Diagnostic System Check - Door Systems in Doors |
| 5 | Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 6 | |
| 6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Retained Accessory Power (RAP) Inoperative
Retained Accessory Power (RAP) Power Mode
Retained accessory power (RAP) is a power mode that permits the operation of selected customer convenience items for 10 minutes after the ignition switch is turned OFF. RAP power mode is enabled by the body control module (BCM). The BCM sends out a class 2 message via the serial data line, which enables/disables other modules at the beginning/end of RAP power mode.
RAP is disabled when
- A door is opened.
- A low battery voltage is detected by the BCM.
- The transition of ignition switch from OFF to ON or ACC.
- 10 minutes have elapsed after the ignition was turned OFF.
The BCM monitors the ignition switch position, battery voltage and passenger compartment door status to determine whether RAP power mode should be enabled. If the ignition switch transitions from ON to OFF, the battery voltage is within the acceptable range and the passenger compartment doors are closed, the BCM enables RAP power mode. After 10 minutes have elapsed, the BCM sends a class 2 message to the serial data network. This message commands the other modules that are power moded by the BCM to stop functioning.