Express 3/4 Ton Van V8-4.8L VIN V (2003)
Steps 3-7
The numbers below refer to the step numbers on the diagnostic table.
1. This step verifies that the RAP power mode function is malfunctioning by checking functions internally enabled by the BCM.
3. The BCM sends class 2 messages to other control modules via the serial data link, allowing them to operate in RAP power mode. Lack of
communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit.
