Test M: No Universal Asynchronous Receiver-Transmitter (UART)-Based Protocol (UBP) Network Communication

PINPOINT TEST M: NO UNIVERSAL ASYNCHRONOUS RECEIVER-TRANSMITTER (UART)-BASED PROTOCOL (UBP) NETWORK COMMUNICATION

M1-M3:

M3-M6:

M7-M12:

M12-M15:

M15-M18:

Normal Operation
The driver climate control seat module, the passenger climate control seat module, the electronic automatic temperature control (EATC) module, and the driver seat module (DSM) communicate with the diagnostic tool through the UBP communications network, circuit 2077 (PK/LB).

Possible Causes
- Circuit 2077 (PK/LB) open, short to ground or voltage
- Driver climate control seat module
- Passenger climate control seat module
- DSM
- EATC module