Test P: No Medium Speed Controller Area Network (CAN) Communication

PINPOINT TEST P: NO MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION

P1-P2:

P2-P5:

P6-P8:

P9-P12:

P13-P16:

P17-P20:

P21-P23:

P24-P26:

P27-P30:

P31-P33:

P34-P35:

P35-P37:

P38-P42:

P43-P46:

Normal Operation
The following modules communicates using the medium speed CAN:
- instrument cluster
- smart junction box (SJB)
- parking aid module (if equipped)
- driver seat module (DSM) (if equipped)
- electronic automatic temperature control (EATC) module (if equipped)
- retractable running board module (if equipped)
- audio control unit or audio control unit with navigation (if equipped)
- satellite radio receiver (if equipped)
- digital versatile disk (DVD) player (if equipped)

The medium speed CAN has an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG).

For normal operation of the medium speed CAN, correct network termination resistance in both the SJB and instrument cluster is required.
The SJB and the instrument cluster share network termination responsibilities with the use of a split termination resistor in each module.

Check the medium speed CAN circuits between each network module and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the medium speed CAN circuits, damage to the DLC C251, damage to one of the module connectors, or a problem in an in-line connector.

Possible Causes
- medium speed CAN data plus circuit VDB06 (GY/OG) open, short to ground, or short to voltage
- medium speed CAN data minus circuit VDB07 (VT/OG) open, short to ground, or short to voltage
- DLC C251
- instrument cluster C220
- SJB C2280d
- EATC module C228a (if equipped)
- audio unit C290b
- DVD player C949 (if equipped)
- DSM C341c (if equipped)
- parking aid module C4014 (if equipped)
- retractable running board module C4322b (if equipped)
- satellite radio receiver C3290 (if equipped)
- instrument cluster
- SJB
- EATC module (if equipped)
- audio control unit or audio control unit with navigation (if equipped)
- DVD player (if equipped)
- DSM (if equipped)
- parking aid module (if equipped)
- retractable running board module (if equipped)
- satellite radio receiver (if equipped)