Without CRT/DID

CIRCUIT DESCRIPTION
A loss of IPC display and messages can result from the following:
^ Loss of +12 volt Power to the IPC.
^ Loss of ground to the IPC.
^ Loss of wake-up signal from BCM.
^ Internal BCM or IPC fault.

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.
1. Checks to see if the BCM is functioning.
2. Checks BCM power and ground sources.
3. Checks for ignition source, power and ground to the IPC. Normally with the key "ON" battery voltage should be present at listed terminals.
4. Checks for a short to ground in any of the 640 CKTs.
5. Checks to see if the short to ground is inside a component or in the circuit itself.
6. Checks to see if IPC is receiving wake-up signal from BCM.