Body Control System Diagnostic System Check

Begin diagnosis of body control system by performing appropriate diagnostic system check for system in which symptom and customer concern is apparent. See DIAGNOSTIC SYSTEM CHECK table. Go to next step.
Connect scan tool to Data Link Connector (DLC). See Figure. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
Turn ignition on. Try to establish communication with Dash Integration Module (DIM), Instrument Panel Module (IPM) and Rear Integration Module (RIM). If scan tool communicates with all 3 modules, go to next step. If scan tool does not communicate with all 3 modules, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
Choose display DTCs function on scan tool for DIM, IPM and RIM. If scan tool displays any DTCs for these modules, go to next step. If scan tool does not display any DTCs for these modules, try to diagnose malfunctioning system or device by symptom. Go to appropriate article for malfunctioning system or device.
If scan tool does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
If scan tool does not display any DTCs listed, go to next step. If scan tool displays DTC B1000, B1004, B1007, B1009, B1656 or B1658, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS .

If scan tool displays DTC B1327 or B1328, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in GENERATORS & REGULATORS - DEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display any DTCs listed, try to diagnose malfunctioning system or device by symptom. Go to appropriate article for malfunctioning system or device.

DIAGNOSTIC SYSTEM CHECK

System	Perform Test
Air Bag	INFLATABLE RESTRAINT SENSING & DIAGNOSTIC MODULE DIAGNOSTIC SYSTEM CHECK
Anti-Lock Brake	ELECTRONIC BRAKE CONTROL MODULE DIAGNOSTIC SYSTEM CHECK
Audible Warnings	AUDIBLE WARNINGS DIAGNOSTIC SYSTEM CHECK
Automatic Air Conditioning	HVAC CONTROL MODULE DIAGNOSTIC SYSTEM CHECK
Automatic Level Control With F45 Suspension	AUTOMATIC LEVEL CONTROL WITH RPO CODE F45 DIAGNOSTIC SYSTEM CHECK
Automatic Level Control Without F45 Suspension	AUTOMATIC LEVEL CONTROL WITHOUT F45 DIAGNOSTIC SYSTEM CHECK
Automatic Transmission Shift Lock Control	AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DIAGNOSTIC SYSTEM CHECK
Cruise Control	CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK
Cellular Communication	CELLULAR TELEPHONE MODULE DIAGNOSTIC SYSTEM CHECK
Body Rear End	BODY REAR END DIAGNOSTIC SYSTEM CHECK
Defogger	DEFOGGER DIAGNOSTIC SYSTEM CHECK
Doors	DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK
Electronic Steering Column	STEERING COLUMN MODULE SYSTEM DIAGNOSTIC CHECK
Engine Controls	POWERTRAIN CONTROL MODULE DIAGNOSTIC SYSTEM CHECK
Engine Cooling	ENGINE COOLING DIAGNOSTIC SYSTEM CHECK
Engine Electrical	ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK
Horns	HORNS DIAGNOSTIC SYSTEM CHECK
Hydraulic Brakes	HYDRAULIC BRAKES DIAGNOSTIC SYSTEM CHECK
Instrument Cluster	INSTRUMENT PANEL CLUSTER MODULE DIAGNOSTIC SYSTEM CHECK
Lighting Systems	LIGHTING SYSTEMS DIAGNOSTIC SYSTEM CHECK
OnStar(R)	NAVIGATION SYSTEMS DIAGNOSTIC SYSTEM CHECK
Parking Brake	PARKING BRAKE DIAGNOSTIC SYSTEM CHECK
Power Seats	POWER SEAT SYSTEMS DIAGNOSTIC SYSTEM CHECK
Power Sunroof	POWER SUNROOF DIAGNOSTIC SYSTEM CHECK
Powertrain On Board Diagnostic (OBD) - Automatic Transmission	POWERTRAIN ON BOARD DIAGNOSTIC SYSTEM CHECK - AUTOMATIC TRANSMISSION
Radio/Audio	RADIO/AUDIO SYSTEM DIAGNOSTIC CHECK
Remote Keyless Entry	REMOTE CONTROL DOOR LOCK RECEIVER SYSTEM DIAGNOSTIC CHECK
Retained Accessory Power	RETAINED ACCESSORY POWER SYSTEM DIAGNOSTIC CHECK
Road Sensing Suspension	ROAD SENSING SUSPENSION DIAGNOSTIC SYSTEM CHECK
Seat Belts	SEAT BELTS DIAGNOSTIC SYSTEM CHECK
Theft Deterrent	THEFT DETERRENT MODULE DIAGNOSTIC SYSTEM CHECK
Tire Pressure Monitoring	TIRE PRESSURE MONITORING DIAGNOSTIC SYSTEM CHECK
Variable Effort Steering	VARIABLE EFFORT STEERING DIAGNOSTIC SYSTEM CHECK