Door System Diagnostic System Check

Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, perform appropriate diagnostic procedure. See appropriate BODY CONTROL MODULES article.
Turn ignition on, engine off. Following scan tool manufacturer's instructions, attempt to establish communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, diagnose communication problem with class 2 device. See appropriate BODY CONTROL MODULES article.
Select display DTCs 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, diagnose by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
If scan tool displays any DTCs which begin with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article. If scan tool does not display any DTCs which begin with "U", go to next step.
If scan tool displays DTC B1000 or DTC B1005, repair these DTCs first. See appropriate BODY CONTROL MODULES article. If scan tool does not display DTC B1000 or DTC B1005, perform appropriate test. SeeDIAGNOSTIC TROUBLE CODE DEFINITIONS table.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾

Description

All Door Lock Circuits Low

All Door Lock Circuits High

Right Front Unlock Switch Circuit Low

Left Front Unlock Switch Circuit High

UXXXX

⁽²⁾

⁽¹⁾	DTCs listed in this table are for testing covered in this article. For a complete listing of DTCs, see appropriate BODY CONTROL MODULES article.

⁽²⁾	For any DTC beginning with the letter "U", diagnose communication problem with class 2 device. See SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.