VQM Boost Mode
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
A = CONSTANT OUTPUT VOLTAGE; B = GROUND; C = FLUCTUATING BATTERY VOLTAGE.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Voltage Quality Module (VQM) |
| 2 | Rear Junction Box (RJB) |
| 3 | Quiescent Current Control Module (QCCM) |
| 4 | Voltage sensitive loads 1 |
| 5 | Voltage sensitive loads 2 |
| 6 | Electric loads |
| 7 | Battery Monitoring System (BMS) control module |
| 8 | Battery |
| 9 | Generator |
| 10 | Starter motor |
During a warm engine restart a hardwired connection from the starter motor relay provides the crank signal to the VQM. At this point the VQM switches into boost mode, and activates the DC-DC converter. The DC-DC converter maintains a constant output voltage between 11V and 14V (depending on the input voltage) to the voltage sensitive loads for 5 seconds. The VQM can support 450W of continuous power in boost mode. After the engine has restarted, and the voltage at the battery terminal will ramp up, the VQM returns to bypass mode.
Boost mode is inhibited at ambient temperatures below 0°C (32°F), when Stop/start function is disabled.