Diagnostic System Check

Connect 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 under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - DEVILLE article.
Turn ignition on. Attempt to establish communication with all door modules (DDM, PFDM, LMDM, RMDM, LRDM, RRDM), Driver Door Switch Assembly (DDSA), Instrument Panel Cluster (IPC), Powertrain Control Module (PCM), Rear Integration Module (RIM) and Remote Function Actuator (RFA). If scan tool communicates with all modules listed, go to next step. If scan tool does not communicate with all modules listed, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - DEVILLE article.
Select display DTCs function for each module listed in step 2 . If any DTCs are set for any module listed, go to next step. If no DTCs are set for any module listed, attempt to diagnose by symptom. See SYMPTOM TESTS .
Retrieve DTCs and perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX table.

DIAGNOSTIC TROUBLE CODE INDEX

DTC

Description

B1000, B1004, B1007, B1009, B1327 Or B1328

⁽¹⁾

Door Key Unlock Cylinder Switch Circuit Low

Left Unlock Switch Circuit Low

Passenger Unlock Switch Circuit Low

Left Lock Switch Circuit Low

Passenger Lock Switch Circuit Low

UXXXX

⁽²⁾

⁽¹⁾	See DIAGNOSTIC TESTS in BODY CONTROL MODULES - DEVILLE article.

⁽²⁾	For any DTC beginning with the letter "U", diagnose communication problem with class 2 device. See SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - DEVILLE article.