Retrieving Diagnostic Trouble Codes (DTCS)

WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Using scan tool connected to Data Link Connector (DLC), retrieve DTCs from Body Control Module (BCM) following scan manufacturer's instructions. Perform appropriate test according to DTC retrieved. See BCM DTC DEFINITIONS table.

BCM DTC DEFINITIONS

DTC ⁽¹⁾

Description

Device Voltage Reference Circuit Low

Device Voltage Reference Circuit High

Retained Accessory Power (RAP) Circuit Low

Retained Accessory Power (RAP) Circuit High

Battery Rundown Protection Circuit Malfunction

Front Foglight Circuit Low

Headlight Control Circuit Low

Park Light Control Circuit Malfunction

Passenger Compartment Dimming Circuit No. 1 High

Passenger Compartment Dimming Circuit No. 2 Low

Passenger Compartment Dimming Circuit No. 2 High

Ambient Light Sensor Circuit Low

Ambient Light Sensor Circuit High

Horn Relay Coil Circuit Low

Key-In-Ignition Circuit Malfunction

Left Front Door Key Switch Circuit Low

Keyless Entry (RFA) Data Link Circuit Low

All Door Lock Circuits Low

All Door Lock Circuits High

Passenger Door Unlock Circuit Low

Passenger Door Unlock Circuit High

U1026 ⁽²⁾

Loss Of ATC Class 2 Communication

U1041 ⁽²⁾

Loss Of EBCM Communication

U1064 ⁽²⁾

Loss Of BCM/VTD Communication

U1300 ⁽²⁾

Class 2 Communication Circuit - Low Voltage

U1301 ⁽²⁾

Class 2 Communication Circuit - High Voltage

⁽¹⁾	For DTCs not listed, repair appropriate system as necessary.

⁽²⁾	For diagnosis, refer to appropriate SELF-DIAGNOSTICS article.