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Retained Accessory Power Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

RAP Relay Coil Control

B1475, 1

1

2

--

Battery Positive Voltage (Relay Output)

3

4

2

--

Accessory Voltage (Relay Output)

3

4

2

--

Ground (RAP Relay)

--

1

--

--

1. All relay controlled RAP functions inoperative.

2. Relay RAP remains on past the timer limit after key out and will not turn off when a vehicle door is opened.

3. Partial relay controlled RAP functions inoperative with open fuse.

4. Partial relay controlled RAP functions inoperative with fuse OK.

Circuit/System Description

The retained accessory power (RAP) system allows specific vehicle functions to operate after the ignition is turned OFF for a predetermined time. The RAP relay is located in the I/P fuse block. The relay switched output feeds the SUNROOF, KEY CAPTURE, DSRVM, PWR WIN DRVR, and the PRW WIN PASS fuses within the fuse block. Relay RAP is controlled by the BCM using inputs from the door ajar switches to determine control of the relay when the ignition is turned OFF. Radio RAP is controlled by a serial data message from the BCM using inputs from the driver door open switch. Refer to Retained Accessory Power Description and Operation for more detail on subsystems using RAP.

Diagnostic Aids
    • The radio and window RAP function are separate RAP functions controlled by serial data and the specific module. These functions are not affected by the BCM RAP relay circuits.
    • A short to ground or open/high resistance in the RAP relay switched voltage circuits will cause only part of the RAP functions to be inoperative. Diagnose these symptoms within the respective system sections.
    • A short to voltage on the RAP relay control or switched voltage circuits would cause the RAP function to remain on past the designated time.
    • A stuck relay switch could cause a RAP always on, or a RAP inoperative condition.

Reference Information

Schematic Reference

Power Moding Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Retained Accessory Power Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note: Battery voltage must remain above 9.6 V for RAP to operate properly.

Radio RAP

  1. With all passenger doors closed, observe the courtesy lamps while opening and closing the driver door. The courtesy lamps should illuminate when the door is opened and turn off approximately 30 seconds after closing the door.
    2. ⇒If the courtesy lamp operation is incorrect from the driver's door, refer to Courtesy Lamps Inoperative or Courtesy Lamps Always On .
  2. If courtesy lamp operation is correct, and the radio is the only RAP concern, replace the radio.

Relay RAP

  1. Ignition ON, observe the scan tool parameters listed below while opening and closing each vehicle door. The reading should change appropriately between High/Low.

    2. Module/Parameter

    • Driver Door Switch
    • Liftgate Ajar Switch
    • Pass Door Switches
    ⇒If any parameter does not change as specified, refer to Door Ajar Indicator Malfunction .
  2. Command the scan tool Accy/RAP Relay OFF. Attempt to operate any RAP relay controlled component within 5 seconds. The component should not operate.
  3. Command the scan tool Accy/RAP Relay ON. Attempt to operate any RAP relay controlled component within 5 seconds. The component should operate.
  4. Ignition ON, all doors closed. Observe the scan tool parameter Accy/RAP Relay Command. Ignition OFF, key removed, the reading should be ON for approximately 10 minutes then change to OFF.
    5. ⇒If the parameter does not respond as specified, replace the BCM.

Circuit/System Testing
  1. Ignition OFF, disconnect the RAP relay.
  2. Test for less than 5 Ω between the ground circuit terminal 85 and ground.
    3. ⇒If greater than specified, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
    4. ⇒If the test lamp does not illuminate, test the B+ circuit terminal 30 for a short to ground or an open/high resistance.
  4. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
    5. ⇒If the test lamp illuminates, test the control circuit terminal 87 for a short-circuit to voltage.
  5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  6. Command the ACC/RAP relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    7. ⇒If the test lamp is always ON, test the control circuit 86 for a short to voltage. If the circuit tests normal, replace the BCM.
    ⇒If the test lamp is always OFF, test the control circuit 86 for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the RAP relay.

Component Testing

Relay Test

  1. Ignition OFF, disconnect the RAP relay.
  2. Test for 70-110 Ω between terminals 85 and 86.
    3. ⇒If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    4. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    ⇒If not the specified value, replace the relay.
  4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 5.0 Ω between terminals 30 and 87.
    5. ⇒If greater than specified, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    •  Relay Replacement : Within an Electrical Center → Attached to Wire Harness
    • Control Module References for module replacement, setup, and programming
   


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