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

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

Courtesy of GENERAL MOTORS CORP.

Loss of IPC display and messages can result from following:

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

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

Courtesy of GENERAL MOTORS CORP.