Test Q: No Universal Asynchronous Receiver-Transmitter (UART)-Based Protocol (UBP) Communications Network Communication
PINPOINT TEST Q: NO UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) COMMUNICATIONS NETWORK COMMUNICATIONQ1:
Q2-Q5:
Q6-Q7:
Q8-Q11:
Q12-Q16:
Q16-Q19:
Q20-Q23:
Q23-Q26:
Q27-Q28:
Normal Operation
The driver climate control seat module, passenger climate control seat module, and parking aid module communicate with the diagnostic tool through the UBP communications network circuit 4-ED6 (OG). If circuit 4-ED6 (OG) becomes open or shorted to ground, communications to that module are not possible. Check circuit 4-ED6 (OG) between the driver climate control seat module, passenger climate control seat module, parking aid module, and the data link connector (DLC) C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is either an open in circuit 4-ED6 (OG), damage to the DLC C251 or damage to the driver or passenger climate control seat module, parking aid module, or a problem with in-line C213, in-line C313, in-line C315 or joint connector No. 1 C261.
If, after individual checks of each circuit leading to a module show resistance values less than 5 ohms, and no in-line connector issues are present, the data link diagnostics test must be run with the module in question disconnected. If the data link diagnostics test passes with the module in question disconnected, it is the source of the concern and should be removed and a new module installed.
Possible Causes
- UBP circuit 4-ED6 (OG) open or short to ground
- DLC C251
- in-line C213
- in-line C313
- in-line C315
- joint connector No. 1 C261
- driver temperature control seat module
- passenger temperature control seat module
- parking aid module