Diagnostic Fault Information
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
DTC B3920 or B3921
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Driver Seat Front Vertical Motor Down Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Front Vertical Motor Up Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Rear Vertical Motor Down Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Rear Vertical Motor Up Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Horizontal Motor Forward Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Horizontal Motor Rearward Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Recline Motor Forward Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Recline Motor Rearward Control | B3920 02 | 1 | B3920 01 | - |
| Driver Seat Lumbar Motor Down Control | B3921 02 | 2 | B3921 01 | - |
| Driver Seat Lumbar Motor Forward Control | B3920 02 | 2 | B3920 01 | - |
| Driver Seat Lumbar Motor Up Control | B3921 02 | 2 | B3921 01 | - |
| Driver Seat Lumbar Motor Rearward Control | B3920 02 | 2 | B3920 01 | - |
| Passenger Massage Up Motor Up | B3921 02 | 2 | B3921 01 | - |
| Passenger Massage Down Motor | B3921 02 | 2 | B3921 01 | - |
| 1. Power seat inoperative 2. Lumbar inoperative |
||||