Chart A, Loss Of IPC Display (CRT Equipped TORONADO & TROFEO)

Fig 1: Chart A - Wiring Schematic (CRT Toronado & Trofeo)

Courtesy of GENERAL MOTORS CORP.

Loss of IPC display and messages can result from the following:

• Loss of 12 volts to IPC
• Loss of ground to IPC
• Loss of wake-up signal from BCM
• Internal BCM or IPC fault
  NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This step checks to see if BCM is awake. If not awake, the cause of blank display is power and ground related.
  2. This step checks BCM power and ground sources.
  3. This step checks to see which BCM has lost, power or ground.
  4. This step checks for ignition source, BCM power and ground to IPC. With ignition on, battery voltage should be present at listed terminals.
  5. Checks for short to ground in any of the 640 circuits.
  6. This step checks to see if short to ground is inside a component or in circuit itself.
  7. This step checks to see if IPC is receiving 7 volts from BCM.

Fig 2: Chart A - Troubleshooting Diagram (CRT Toronado & Trofeo)

Courtesy of GENERAL MOTORS CORP.