Diagnostic Aids

• The body control module (BCM) detects that the ignition is ON and sends the appropriate power mode message to the other modules. Therefore, the BCM must be connected to the DLC for any other module to communicate with the scan tool.
• When the class 2 serial data circuit:
  • Is shorted to ground
  • Is shorted to voltage

The following DTCs may set:

• U1300
• U1301
• U1305