Diagnostic System Check

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.
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.
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 SYMPTOM TESTS .

Retrieve codes and perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX table.

DIAGNOSTIC TROUBLE CODE INDEX

DTC ⁽¹⁾

Description

B1000, B1007 or B1009

⁽²⁾

B1327 or B1328

⁽³⁾

⁽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.

⁽²⁾	See BODY CONTROL MODULES - DEVILLE article.

⁽³⁾	See DIAGNOSTIC TESTS in BODY CONTROL MODULES - DEVILLE article.