Pinpoint Test B: The Power Running Board (PRB) Does Not Operate Correctly - Left Running Board Does Not Deploy/Stow or Reverses
Power Running Board (PRB)
Pinpoint Test B: The Power Running Board (PRB) Does Not Operate Correctly - Left Running Board Does Not Deploy/Stow or Reverses Direction
Refer to Wiring Diagram Set 109, Power Liftgate/Retractable Running Boards for schematic and connector information. Diagrams By Number
Normal Operation
During self-test, the Power Running Board (PRB) module monitors the length of time it takes to deploy and stow the LH and RH PRBs. If the time exceeds 4 seconds, DTC B2813 or B2814 will be generated.
The PRB module receives door ajar and vehicle speed status over the Controller Area Network (CAN). During LH PRB deployment, the PRB module supplies power to the LH PRB motor through circuit CPR41 (BU/WH) and ground through circuit CPR42 (WH). The PRB module stows the LH PRB by supplying power to the LH PRB motor through circuit CPR42 (WH) and ground through circuit CPR41 (BU/WH). The PRB module provides a regulated 10-volt power supply to the Hall-effect sensor (internal to the PRB motor) through circuit CPR47 (GY/BN). The Hall-effect ground is provided by the PRB module through circuit RPR47 (BU/GN). The PRB module monitors the LH PRB Hall-effect signal through circuit VPR43 (GY/BU). If the PRB module does not receive any signal from the Hall-effect sensor during operation, the PRB will stop.
- B2813 (LH Power Running Board Stow Time Fail) - When the left running board takes greater than 4 seconds to stow.
- B2814 (LH Power Running Board Deploy Time Fail) - When the left running board takes greater than 4 seconds to deploy.
This pinpoint test is intended to diagnose the following:
- Mechanical resistance due to foreign material
- Wiring, terminals or connectors
- Door ajar switch
- PRB module
- LH PRB motor
PINPOINT TEST B: THE POWER RUNNING BOARD (PRB) DOES NOT OPERATE CORRECTLY - LEFT RUNNING BOARD DOES NOT DEPLOY/STOW OR REVERSES DIRECTION
B1-B6:
B6-B8:
B8-B10:
B10-B12:
