Body Control Module (BCM) Diagnostic System Check
- Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL DOES NOT POWER UP
.
- Turn ignition on, engine off. Try to establish scan tool communication with BCM. If communication with BCM is established, go to next step. If communication with BCM is not established, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE.
- Select display DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose malfunctioning system or device by symptom. Go to appropriate article for malfunctioning system or device.
- If scan tool displays any DTCs that begin with "U", go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE. If scan tool displays DTCs that begin with "B", go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS
table. If scan tool does not display DTCs with "B" or "U", go to system in which customer concern is addressed.
BODY CONTROL MODULE (BCM) DTC DEFINITIONS
| DTC |
Module |
Description |
| B1552 |
BCM |
Loss Of BCM Keep Alive Memory (KAM) |
| B1556 |
BCM |
BCM EEPROM Write Error |
| B1558 |
BCM |
BCM EEPROM Checksum Error |
| B1656 |
Radio |
Radio EEPROM Write Error |
| B1658 |
Radio |
Radio EEPROM Checksum Error |
| B1760 |
Radio |
CD Changer Not Responding |
| B1780 |
Radio |
Theft Lock Enabled |
| B1970 |
BCM |
Exterior Light Power Fault |
| B1971 |
BCM |
Inadvertent Power Fault |
| B1973 |
BCM |
High Power Control Fault |
| B1982 |
BCM |
Battery Voltage Too High |
| B1982 |
Radio |
Battery Voltage Too High |
| B1983 |
BCM |
Battery Voltage Too Low |
| B1983 |
Radio |
Battery Voltage Too Low |
| B2462 |
RIM |
GPS Signal Error |
| B2470 |
BCM |
Daytime Running Lights Fault |
| B2471 |
BCM |
Interior Lights Fault |
| B2472 |
BCM |
Low Beam Fault |
| B2473 |
BCM |
High Beam Fault |
| B2476 |
BCM |
Parking Lights Fault |
| B2476 |
Radio |
Cellular Phone Select Service Switch Malfunction |
| B2556 |
BCM |
EEPROM Error |
| B2560 |
BCM |
Remote Keyless Entry (RKE) Message Validation Error |
| U1300 |
BCM, IRC |
Class 2 Short To Ground |
| U1301 |
BCM, IRC |
Class 2 Short To Battery |
| U2100 |
EBTCM, ECM, TCM |
CAN-BUS Communication Malfunction |
| U2103 |
EBTCM, ECM |
Fewer Controllers On Bus Than Programmed |
| U2104 |
EBTCM, ECM, TCM |
CAN Bus Reset Counter Overrun |
| U2105 |
EBTCM, TCM |
Lost Communication With Engine Control Module (ECM) |
| U2106 |
EBTCM, ECM |
Lost Communication With Transmission Control System (TCM) |
| U2108 |
ECM, TCM |
Lost Communication With ABS Control System (EBTCM) |