Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Module B+

U0100-U02FF

U0100-U02FF

-

-

Module Ignition

U0100-U02FF

U0100-U02FF

-

-

Module Ground

U0100-U02FF

U0100-U02FF

-

-

Accessory Wake Up Serial Data

U1814

U0100-U02FF

-

-

High Speed GMLAN Serial Data Wake Up

U2099

U0100-U02FF

-

-

High Speed GMLAN Serial Data (+)

⁽²⁾

U0100-U02FF

⁽²⁾

-

High Speed GMLAN Serial Data (-)

⁽²⁾

U0100-U02FF

⁽²⁾

-

Low Speed GMLAN Serial Data

⁽¹⁾

U0100-U02FF

⁽¹⁾

-

⁽¹⁾	Scan tool does not communicate with low speed GMLAN device

⁽²⁾	Scan tool does not communicate with high speed GMLAN device