DeVille V8-4.6L VIN Y (1998)
Body Control Module: Description and Operation
Controlled Power
The controlled power relay supplies power to the components under controlled power. The Body Control Module (PZM) does not control the high
power control output. Instead, the output is grounded whenever the PZM is awake. The output also is grounded for 15 minutes after you turn the ignition
switch to the LOCK position in order to obtain the RAP function. The following components are under controlled power:
1. The instrument cluster
2. The radio
3. The amplifier/radio interface module (RIM)
4. The cellular telephone (PHN)
5. The high beam relay
6. The fuel door release relay
7. The trunk release relay
After the 15 minutes elapse, the modules enter a sleepstate. The modules receive any necessary power from the low power driver output of the PZM. If
the PZM is in the low power mode, and the PZM detects that the current exceeds approximately 2.4 amperes, the PZM wakes up and re-enters the high
power mode. If the vehicle remains inactive with the ignition in the LOCK position and without any PZM wake-ups for a period of 3 days, the PZM
deactivates the low power driver output.
