System Tests: Notes

WARNING: Vehicle may be equipped with side air bags. Before testing or repairing components around driver's and passenger's seats, disable side air bags. See appropriate AIR BAG RESTRAINT SYSTEMS article.

CAUTION: When battery is disconnected or modules are replaced, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

NOTE: The following system tests apply only to vehicles with memory mirrors. If testing power mirror system without memory, test individual components and check wiring. See COMPONENT TESTS and WIRING DIAGRAMS .

NOTE: Before beginning any testing, perform TROUBLE SHOOTING .

NOTE: Before replacing any control module, ensure all module ground and power circuits are functioning properly. For circuit identification, see GROUND DISTRIBUTION and POWER DISTRIBUTION articles in WIRING DIAGRAMS.

NOTE: Test procedures are written specifically for New Generation Star (NGS) tester. Generic scan tools may not have the capability of performing all the same functions. Refer to scan tool manufacturer's instructions.

NOTE: Inside automatic dimming mirror may also be referred to as electronic day/night mirror.

NOTE: After repairs are complete, ensure all components are properly installed and all harness connectors are connected properly and repeat data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - TOWN CAR article.

SYMPTOM INDEX

Symptom	Perform Test
No Communication With Driver's Door Module	A
No Communication With Driver's Seat Module	B
Single Mirror Inoperative	C
Mirror Operates In One Second Intervals	D
Reverse Tilt Feature Inoperative	E
Automatic Dimming Function Inoperative	F
Memory Mirrors Inoperative	G
Heated Mirrors Inoperative	H