Diagnostic System Check
- Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT.
- Turn ignition on, engine off. Try to establish scan tool communication with each module on Class 2 serial data circuit. If communication with each module is established, go to next step. If communication with each module is not established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT.
- Select display DTC function for each module. Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If DTCs are displayed, go to next step. If no DTCs are displayed, see ON-VEHICLE TESTING .
- Retrieve codes and perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX
table.DIAGNOSTIC TROUBLE CODE INDEX
DTC (1) Description B1000, B1004, B1007 or B1009 (2) B1327 or B1328 (3) B1513 Charging System Volts Low B1514 Charging System Volts High P0560, P0562, P0563, P0615, P0621 or P0622 (4) (1) For any DTC beginning with the letter "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT. (2) See BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT. (3) See DIAGNOSTIC TESTS in BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT. (4) See TROUBLE CODE DEFINITION table in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.