Test B: The Retractable Running Board Does Not Operate Correctly - Left Running Board

PINPOINT TEST B: THE RETRACTABLE RUNNING BOARD DOES NOT OPERATE CORRECTLY - LEFT RUNNING BOARD

B1-B4:

B4-B6:

B6-B8:

B9:

Normal Operation
The power running board (PRB) module receives door ajar, operating configuration from the cluster 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 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.

Possible Causes
- Open in circuit CPR47 (GY/BN), RPR47 (BU/GN), VPR43 (GY/BU), CPR41 (BU/WH) or CPR42 (WH)
- Short to ground in circuit VPR43 (GY/BU), CPR41 (BU/WH) or CPR42 (WH)
- Short to battery in circuit VPR43 (GY/BU), CPR41 (BU/WH) or CPR42 (WH)
- Short circuit between CPR41 (BU/WH) and CPR42 (WH)
- PRB module
- LH PRB mechanical assembly
- LH PRB motor