Ideally, you are going to want a scan tool to connect and validate that a class 2 device, or the class 2 system can not be communicated with. There is no one ground that is common with the modules on the buss, and they are located throughout the vehicle. The only possibility, is determining if there has been anything done to the vehicle that may play a part in causing a fault. Body repair, aftermarket stuff removed or installed(I know you said there was none), major repairs that could have left wiring susceptible to heat or other damage, could name a few. In looking at your list of codes, the only thing remotely synonimous is that most control units(the ones that use info from) set faults with the modules that show no data. The U1300 code, is class 2 short to ground, and a few modules had reported it. The IPC even reported a U1301 which is a short to voltage. Shorts to voltage are more rare, because they have to be more specific in nature. A short to ground can occur anywhere. The fault chart for Scan tool does not communicate with class 2 is lengthy, because there is no sure shot way to track down a fault. I have included that for your reference. Basically, it has you do what I have stated, and that is disconnect the modules one at a time, until communication is restored.
Scan Tool Does Not Communicate with Class 2 Data Line
Step
Action
Value(s)
Yes
No
1
Was the Diagnostic System Check performed?
--
Go to Step 2
Go to Data Link Communications System Check
2
Connect the scan tool to another vehicle of the same model year (to ensure proper operation of the scan tool).
Turn the ignition switch to RUN.
Attempt to establish communication with the vehicle.
Does the scan tool communicate with the vehicle?
--
Go to Step 4
Go to Step 3
3
The scan tool may be malfunctioning. Refer to the scan tool instruction manual in order to ensure that the scan tool is functioning.
Does the scan tool operate properly?
--
Go to Data Link Communications System Check
--
4
Connect the scan tool to the original vehicle.
Verify that the scan tool connections are clean and tight.
Is the terminal contact between the DLC and the scan tool OK?
--
Go to Step 6
Go to Step 5
5
Repair the terminal contact at the DLC.
Is the repair complete?
--
Go to Step 71
--
6
Turn the ignition switch to RUN.
Does the scan tool turn on?
--
Go to Step 12
Go to Step 7
7
Measure the voltage between the DLC terminal 16 and chassis ground.
Is the voltage within the specified range?
10-15 V
Go to Step 9
Go to Step 8
8
Repair the open or short to ground in CKT 3640 (ORN).
Is the repair complete?
--
Go to Step 71
--
9
Measure the voltage from the DLC terminal 16 to terminal 5.
Is the voltage within specified range?
10-15 V
Go to Step 11
Go to Step 10
10
Repair the open in CKT 351 (BLK/WHT).
Is the repair complete?
--
Go to Step 71
--
11
Check for voltage from DLC terminal 16 to terminal 4.
Is the voltage within specified range?
10-15 V
Go to Step 13
Go to Step 12
12
Repair the open in CKT 450 (BLK).
Is the circuit repair complete?
--
Go to Step 71
--
13
Disconnect the Powertrain Control Module (PCM).
Attempt to establish communications with the Dash Integration Module (DIM).
Does the scan tool communicate with the vehicle?
--
Go to Step 14
Go to Step 15
14
Replace the PCM.
Is the repair complete?
--
Go to Step 71
--
15
Disconnect the Electronic Brake and Traction Control Module (EBCTM).
Attempt to establish communication with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 16
Go to Step 18
16
Inspect CKT 1807 (PPL) between the EBTCM terminal 10 and the PCM C1 terminal 59 for a short to ground or battery positive voltage (B+).
Was a short found?
--
Go to Step 70
Go to Step 17
17
Replace the EBTCM.
Is the repair complete?
--
Go to Step 71
--
18
Is the vehicle equipped with A45?
--
Go to Step 19
Go to Step 21
19
Disconnect the Memory Seat Module (MSM).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 20
Go to Step 21
20
Replace the MSM.
Is the repair complete?
--
Go to Step 71
--
21
Is the vehicle equipped with a cellular telephone module?
--
Go to Step 22
Go to Step 24
22
Disconnect the cellular telephone module.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 23
Go to Step 24
23
Replace the cellular telephone module.
Is the repair complete?
--
Go to Step 71
--
24
Disconnect the instrument cluster (IPC).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 25
Go to Step 27
25
Inspect CKT 1807 (PPL) between the IPC C2 terminal B8 and the EBTCM terminal 26 for a short to ground or battery positive voltage (B+).
Was a short found?
--
Go to Step 70
Go to Step 26
26
Replace the IPC.
Is the repair complete?
--
Go to Step 71
27
Disconnect the Pass-Key III Theft Deterrent Module.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 28
Go to Step 30
28
Inspect CKT 1807 (PPL) between the Pass-Key III Theft Deterrent Module terminal E and the IPC C1 terminal B8 for a short to ground or battery positive voltage (B+).
Was a short found?
--
Go to Step 70
Go to Step 29
29
Replace the Pass-Key III Theft Deterrent Module.
Is the repair complete?
--
Go to Step 71
--
30
Is the vehicle equipped with N37?
--
Go to Step 31
Go to Step 33
31
Disconnect the steering column tilt/telescoping module.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 32
Go to Step 33
32
Replace the steering column tilt/telescoping module.
Is the repair complete?
--
Go to Step 71
--
33
Is the vehicle equipped with UY4?
--
Go to Step 37
Go to Step 34
34
Disconnect the radio.
Attempt to establish communication with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 35
Go to Step 37
35
Inspect CKT 1807 (PPL) between the radio terminal E6 and the Pass-Key II Theft Deterrent Module terminal E for a short to ground or battery positive voltage (B+).
Was a short found?
--
Go to Step 70
Go to Step 36
36
Replace the radio.
Is the repair complete?
--
Go to Step 71
--
37
Disconnect the Instrument Panel Integration Module (IPM).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 38
Go to Step 40
38
Inspect CKT 1807 (PPL) for a short to ground or a battery positive voltage (B+) between the IPM C1 terminal C7 and one of the following components:
"Â Radio terminal F6 (W/O UY4).
"Â Pass-Key III Theft Deterrent Module Terminal E (W/ UY4).
Was a short found?
--
Go to Step 70
Go to Step 39
39
Replace the IPM.
Is the repair complete?
--
Go to Step 71
--
40
Disconnect the Left Front Door Module (LFDM).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 41
Go to Step 42
41
Replace the LFDM.
Is the repair complete?
--
Go to Step 71
--
42
Disconnect the Remote Keyless Entry Module (RKE).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 43
Go to Step 44
43
Replace the RKE module.
Is the repair complete?
--
Go to Step 71
--
44
Is the vehicle equipped with U84?
--
Go to Step 47
Go to Step 45
45
Disconnect the radio amplifier.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 46
Go to Step 56
46
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the radio amplifier C1 terminal B11 (W/U48), C3 terminal 5 (W/U49) and one of the following components:
"Â RKE module terminals 3 and 4.
"Â MSM C2 terminals D14 and D15.
"Â LFDM C1 terminal 13.
"Â PCM C1 terminal 58.
Was a short found?
--
Go to Step 70
Go to Step 55
47
Disconnect the radio.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 48
Go to Step 50
48
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the radio C1 terminal F6 and the RKE module terminal 3.
Was a short found?
--
Go to Step 70
Go to Step 49
49
Replace the radio.
Is the repair complete?
--
Go to Step 71
--
50
Disconnect the navigation data processor.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 51
Go to Step 53
51
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the radio C1 terminal E6 and the navigation data processor C1 terminal 2.
Was a short found?
--
Go to Step 70
Go to Step 52
52
Replace the navigation data processor.
Is the repair complete?
--
Go to Step 71
--
53
Disconnect the radio amplifier.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 54
Go to Step 56
54
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the radio amplifier C1 terminal B11 (W/U48), C3 terminal 5 (W/U49) and the navigation data processor C1 terminal 3.
Was a short found?
--
Go to Step 70
Go to Step 55
55
Replace the radio amplifier.
Is the repair complete?
--
Go to Step 71
--
56
Is the vehicle equipped with F45?
--
Go to Step 57
Go to Step 60
57
Disconnect the CVRSS module.
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 58
Go to Step 60
58
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the CVRSS module C1 terminal D4 and the radio amplifier.
Was a short found?
--
Go to Step 70
Go to Step 59
59
Replace the CVRSS module.
Is the repair complete?
--
Go to Step 70
--
60
Disconnect the Rear Integration Module (RIM).
Attempt to establish communication with the DIM.
Does the vehicle communicate with the vehicle?
--
Go to Step 61
Go to Step 63
61
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the RIM C2 terminal B3 and the CVRSS module (W/F45), or the radio amplifier (W/O F45).
Was a short found?
--
Go to Step 70
Go to Step 62
62
Replace the RIM.
Is the repair complete?
--
Go to Step 71
--
63
Disconnect the inflatable restraint sensing and diagnostic module (SDM).
Attempt to establish communications with the DIM.
Does the scan tool communicate with the vehicle?
--
Go to Step 64
Go to Step 66
64
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the SDM terminal 5 and the following components:
"Â RIM C2 terminal B4.
"Â Cellular telephone module terminal 9.
Was a short found?
--
Go to Step 70
Go to Step 65
65
Replace the SDM.
Is the repair complete?
--
Go to Step 71
--
66
Reconnect the IPM.
Disconnect the DIM.
Attempt to establish communications with the IPM.
Does the scan tool communicate with the vehicle?
--
Go to Step 67
Go to Step 69
67
Inspect CKT 1807 (PPL) for a short to ground or battery positive voltage (B+) between the DIM C2 terminal A11 and the SDM terminal 17.
Was a short found?
--
Go to Step 70
Go to Step 68
68
Replace the DIM.
Is the repair complete?
--
Go to Step 71
--
69
Repair an open or short to ground or battery positive voltage (B+) in CKT 1807 (PPL) between the DLC terminal 2 and one of the following components:
"Â IPM C1 terminal C8.
"Â DIM C2 terminal A12.
Is the repair complete?
--
Go to Step 71
--
70
Repair the short to ground or battery positive voltage (B+) in CKT 1807 (PPL).
Is the repair complete?
--
Go to Step 71
--
71
Reconnect or reinstall any connectors or components that were disconnected or removed.
Clear all of the DTC's.
Are all of the DTC's cleared?
--
Go to Data Link Communications System Check
--
Wednesday, September 22nd, 2010 AT 11:21 PM