Preliminary Procedure

Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Using scan tool, perform DATA LINK DIAGNOSTIC TEST. If scan tool displays CKT 914, CKT 915 or CKT 70=ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - MUSTANG article. If scan tool displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), perform TEST A: NO COMMUNICATION WITH GENERIC ELECTRONIC MODULE under SYSTEM TESTS.
If scan tool displays SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Perform self-test diagnostics for GEM using scan tool. If GEM DTCs are retrieved, see GENERIC ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX table to continue diagnosis. Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - MUSTANG article. If no DTCs are retrieved, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.

GENERIC ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC⁽¹⁾

Description

Perform Test

B1217

Horn Relay Coil Circuit Failure

B1218

Horn Relay Coil Circuit Short To Voltage

B1342

ECU Defective

⁽²⁾

B1396

Power Door Lock Circuit Short To Voltage

B1397

Power Door Unlock Circuit Short To Voltage

B1498

Deck Lid Punch-Out Sensor Ground Short

B1551

Deck Lid Release Circuit Failure

B1553

Deck Lid Release Circuit Short To Voltage

⁽¹⁾	Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - MUSTANG article.

⁽²⁾	Using scan tool, retrieve and document all continuous Generic Electronic Module (GEM) DTCs. Perform GEM self-test. If DTC B1342 is retrieved again, replace GEM. See REMOVAL & INSTALLATION .