Self-Diagnostic System: Notes

Body Control Module (BCM) is equipped with a self-diagnostic system, which detects system abnormalities and sets appropriate Diagnostic Trouble Codes (DTCs). See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. Malfunctions are recorded as history/intermittent failures or as current failures. Current DTCs indicate BCM has detected a fault which currently exists. A history DTC is a fault that disappears in the next ignition cycle.

DTC	Description
B1001 (2)	Vehicle Interface Unit Malfunction
B1397	Device Voltage Reference Out # 1 Circuit Low
B1398	Device Voltage Reference Out # 1 Circuit High
B1477	RAP Circuit Low
B1478	RAP Circuit High
B1480	Battery Rundown Protection Circuit Malfunction
B2577	ALC Headlight Control Circuit Low
B2585	Park Light Control Circuit Malfunction
B2600	DRL Light Circuit Malfunction
B2613	Passenger Compartment Dimming 1 Circuit High
B2617	Passenger Compartment Dimming 2 Circuit Low
B2618	Passenger Compartment Dimming 2 Circuit High
B2647	Ambient Light Sensor Short To Ground/Open
B2648	Ambient Light Sensor Short To Battery
B2752	Horn Relay Coil Circuit Low
B2947	Security System Sensor Power Circuit Low
B2948	Security System Sensor Power Circuit High
B2957	Security System Sensor Data Circuit Low
B2958	Security System Sensor Data Circuit High
B2960	Security System Sensor Data Incorrect But Valid
B3031	Security System Controller In Learn Mode
B3033	Security System Indicates Tamper
B3137	All Door Lock Circuits Low
B3138	All Door Lock Circuits High
B3147	Right Front Unlock Switch Circuit Low
B3148	Right Front Unlock Switch Circuit High
U1000 & U1255	Class 2 Communication Malfunction
U1001-U1088	Loss Of XXX Communications
U1300	Class 2 Serial Data Link Low
U1301	Class 2 Serial Data Link High
(1) See DIAGNOSTIC TESTS  for test and repair procedures. (2) For air bag DIAGNOSIS & TESTING or DISPOSAL PROCEDURES, see lemon-25(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.