Diagnostic Fault Information

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Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Module B+	U0100-U0299 *	U0100-U0299 *	-	-
Ignition	U0100-U0299 *	U0100-U0299 *	-	-
Module Ground	U0100-U0299 *	U0100-U0299 *	-	-
Accessory Wake Up Serial Data (circuit 5985)	U1814 *	U0100-U0299 *	-	-
Communication Enable (circuit 5986)	U2099 *	U0100-U0299 *	-	-
Wake Up Signal (circuit 932)	B137B 06 *	U182A *	U189A *	-
Wake Up Signal (circuit 968)	B137A 06 *	U1812 *, U189A in HPCM	3	-
High Speed GMLAN Serial Data (+)	2 *	U0100-U0299*	2 *	-
High Speed GMLAN Serial Data (-)	2 *	U0100-U0299 *	2 *	-
PTLAN (+)	U0074 *	U0100-U0299 *, or U18xx	U0074 *	-
PTLAN (-)	U0074 *	U0100-U0299 *, or U18xx	U0074 *	-
Low Speed GMLAN Serial Data	1 *	U0100-U0299 *	1 *	-
* Multiple U0xxx or U18xx DTCs may be present depending on the location of the open circuit. 1. Scan tool does not communicate with low speed GMLAN device 2. Scan tool does not communicate with high speed GMLAN device 3. Parasitic drain on battery, and will set DTC U1875, U1876, U1878, U1879 as history in the HPCM with the key ON, or as current with the key OFF.