Entertainment Schematic Icons
Entertainment Schematic Icons Icon Icon Definition IMPORTANT: Twisted-pair wires provide an effective"shield" that helps protect sensitive electronic components from electrical interference. In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown: The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as measured anywhere along the length of the wires. The outside diameter of the twisted wires must not exceed 6.0 mm (0.2 in)
Scheme 8
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: Lack of communication may be due to a partial malfunction of the GM LAN serial data circuit or due to a total malfunction of the GM LAN serial data circuit. The specified procedure will determine the particular condition.
- 3: The symptom list in Symptoms will determine the correct diagnostic procedure to use.
- 4: The presence of DTCs which begin with U indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Install a scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications |
| 2 | Attempt to establish communication with the following: Radio Digital Radio Receiver (U2K) Does the scan tool communicate with all devices present? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Low Speed GMLAN Device in Data Link Communications |
| 3 | Select the following display DTC functions on the scan tool: Radio Digital Radio Receiver (U2K) Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms - Entertainment |
| 4 | Does the scan tool display any DTCs which begin with a U? | Go to Scan Tool Does Not Communicate with Low Speed GMLAN Device in Data Link Communications | Go to Step 5 |
| 5 | Does the scan tool display DTC B1000? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 |
| 6 | Does the scan tool display DTC B1325? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | Go to Diagnostic Trouble Code (DTC) List |
Diagnostic System Check - Entertainment System