1993 CHEVROLET DYNASTY engine

VEHICLE THEFT SECURITY SYSTEM
CONTENTS
page page
GENERAL INFORMATION .................. 1
SECURITY SYSTEM DOOR SWITCH REPLACEMENT ........................ 2
SECURITY SYSTEM HOOD SWITCH REPLACEMENT ........................ 2 SYSTEM SELF-TESTS
.................... 1
VEHICLE THEFT SECURITY SYSTEM MODULE REPLACEMENT ........................ 2
WHAT WILL TRIGGER THE SYSTEM ........ 1
GENERAL INFORMATION
JUMP-STARTING, VEHICLE EQUIPPED
WITH THEFT SECURITY SYSTEM . After the
booster battery has been connected, the Theft System
must be turned OFF. Using the key, lock then un-
lock either front door. This turns the Theft System
OFF and the remainder of the Jump-Starting proce-
dure can be followed. If this procedure is not followed, the Theft System
electronics will prevent the engine from starting. If a new Powertrain Control Module is installed,
the engine has to be cranked 20 times before the
alarm system activated. This passive system is designed to protect against
whole vehicle theft. The system monitors vehicle
doors, hood, trunk key cylinder, and ignition action
for unauthorized operation. The alarm activates by
sounding the horn, flashing the park and tail lamps,
and providing an engine kill feature (Fig. 1). Passive arming occurs upon normal vehicle exit,
open door, lock with power locks, close door. The SET
lamp in the panel will flash for 15 seconds, indicat-
ing that arming is in progress. If no monitored sys-
tems are activated during this period, the system
will arm. If the hood or trunk key cylinder switches
are not sensed by the system. The SET lamp will re-
main lit during the arming process, although the sys-
tem will still arm. The system is to be considered as
an active armed system when using the Remote Key-
less Entry. If the SET lamp does not illuminate at all
upon door closing it indicates that the system is not
arming. Passive disarming occurs upon normal vehicle en-
try unlocking either door with the key, or unlocking
using the Remote Keyless transmitter. This disarm-
ing will also halt the alarm once it has been acti-
vated. Whenever the battery is disconnected and recon-
nected, the Vehicle Theft Security System enters
power up alarm mode which flashes the park and tail
lamps and prevents the engine from running. To exit
this mode, the system must be disarmed as men-
tioned above. A tamper alert exists to notify the driver that the
alarm had been activated, and the alarm has since
timed-out for more than 18 minutes. This alert con-
sists of 3 horn pulses when the vehicle is disarmed. The alarm system will not arm if the doors are
manually locked, providing a manual override of the
alarm.
WHAT WILL TRIGGER THE SYSTEM
One of the following actions will trigger the system
while it is armed. Without properly disarming sys-
tem, by using the key or the remote transmitter. (1) Opening the HOOD.
(2) Opening any DOOR.
(3) Removing the TRUNK KEY CYLINDER.
(4) Turning the IGNITION ON.
(5) The ignition switch can be turned to the acces-
sory position without triggering alarm system.
SYSTEM SELF-TESTS
A diagnostics mode is available in the system to
verify operation of all monitored switches or circuits.
To enter diagnostics, cycle the ignition key to the ac-
cessory position 3 times, leaving the key in this po-
sition. Upon entering diagnostics, the park and tail lamps
will begin flashing to verify their operation. In addi-
tion, the horn will sound twice to indicate that the
trunk key cylinder is in its proper position. Return-
ing the ignition to the OFF position will stop the
lamps from flashing while keeping the system in di-
agnostics. While in diagnostics mode, a horn pulse should oc-
cur at each of the following events indicating proper
operation: (1) Beginning with all doors closed, open then close
each door. The horn will sound when the door ajar
switch closes, and then again when the switch opens.
There must b e a 1 second delay between closing and
opening the switch. (2) Open, then close the hood. The horn will sound
when the hood is opened, and again when it is closed.
Ä VEHICLE THEFT SECURITY SYSTEM 8Q - 1

(3) Activate the power door locks in both the
LOCK and UNLOCK directions. The horn will sound
after each activation. (4) Rotate the key in each of the door lock cylin-
ders to the unlock position. The horn will sound as
the switch closes, and again when it opens. There
must b e a 1 second delay between changing switch
states, or the horn will not sound.
² Press the LOCK button,horn will sound.
² Press the UNLOCK button, horn will sound.
(5) Cycle the key to the ignition RUN position. A
single horn pulse will indicate proper operation of
the ignition input. This will also take the module out
of the diagnostics mode. For any of these tests, if the
switch does not remain open or closed for at least 1
second, the horn will only sound once. The lack of a horn pulse, during any operation, in-
dicates a switch failure. Check for continuity at the
switch, if this is good, check for an open or shorted
wire between the switch and alarm module. Also,
check if a new powertrain control module has been
installed recently. Vehicle Theft Security System will
not function until 20 engine cranks. Whenever a Vehicle Theft Security System mal-
function occurs, first verify that the wire harness is
properly connected to all connectors before starting
normal diagnosis and repair procedures. Refer to Ve-
hicle Theft Security System Diagnosis Chart (Fig. 3).VEHICLE THEFT SECURITY SYSTEM MODULE
REPLACEMENT
If the Vehicle Theft Security System module is be-
ing removed and no replacement module is being in-
stalled, the module wiring must be disconnected
while the engine is running. Failure to do so will
cause a no-start condition (Fig. 3 and 4). (1) Remove lower right instrument panel silencer.
(2) Remove glove box assembly.
(3) Remove three attaching screws mounting the
bracket to instrument panel. (4) Lower bracket and module assembly, to discon-
nect wire connectors. (5) Remove the Remote keyless module so to have
access to the Security Module two screws attaching
module to bracket. (6) For installation reverse above procedures.
SECURITY SYSTEM HOOD SWITCH REPLACEMENT
(1) Remove screw from left inner fender (Fig. 5).
(2) Disconnect wiring.
(3) Remove switch.
(4) For installation reverse above procedures.
SECURITY SYSTEM DOOR SWITCH REPLACEMENT
(1) Remove door trim panel and water shield. Re-
fer to Group 23, Body.
Fig. 1 Vehicle Theft Security System Components
8Q - 2 VEHICLE THEFT SECURITY SYSTEM Ä

AUTOMATIC DAY/NIGHT INSIDE MIRROR
Operational test:
² Turn ignition switch to the ON position with the
vehicle in park (Fig. 21).
² Place mirror switch in the high position.
² Cover the forward facing sensor with dark cloth to
keep out any ambient light.
² Shine a light into the rear facing sensor, watch to
see if the mirror darkens. With the mirror darkened, place the vehicle in re-
verse, the mirror should return to its normal condi-
tion. If the above conditions are met the mirror is oper-
ating properly.
² If not test voltage.
Test three way connector harness. Refer to Fig. 21. (1) Pin 1 Ignition Switch in run position, should
have battery voltage. (2) Pin 2 Should have continuity to Ground.
(3) Pin 3 When the transmission is in reverse,
should have battery voltage. (4) If test is OK replace Mirror.
(5) If not refer, to Wiring Diagrams manual to test
the circuits.
AUTOMATIC DAY/NIGHT INSIDE MIRROR WITH
ULTRALIGHT HEADLAMP CONTROL
CAUTION:When JUMP STARTING the vehicle, be-
fore cranking engine turn ignition ON and turn OFF
the Automatic Headlamp Control.
The mirror automatically reduces the amount of
headlamp glare from rear approaching traffic and
provides automatic headlamp control (Fig. 22).
SELF DIAGNOSTIC MODEÐOPERATIONAL TEST:
(1) Place shift selector in park (P) or Neutral (N)
position. With ignition OFF, press and hold AUTO
MIRROR and AUTO LAMP (headlamp) buttons, turn
ignition switch ON. When LED indicators start
flashing, release buttons. (a) The button LED indicators should flash for
about five seconds.
² AUTO MIRROR
² DARK
² AUTO LAMP
(b) If they continue to flash much longer than
five seconds, the mirror assembly is defective.
Fig. 20 Header Mirror/Reading Lamps
Fig. 21 Automatic Day / Night Mirror
Fig. 22 Automatic Day / Night Mirror with Ultralight Headlamp Control
Ä POWER MIRRORS 8T - 7

In certain instances a wire may be referenced to
another sheet. When this happens, the wire will be
identified as to what it is ie: feed, ground, etc, and
where its going (Fig. 6). This has been done to aid in
the diagnosis of wiring and component problems.
The index used for the diagrams is located at the be-
ginning of the section. And is in alphabetical order to
identify the main system and all related components.
WIRE CODE IDENTIFICATION
Each wire shown in the diagrams contains a code
(Fig. 7) which identifies the main circuit, part of the
main circuit, gauge of wire, and color. The color is
shown as a two letter code which can be identified by
referring to the Wire Color Code Chart (Fig. 8). If
the wire has a tracer and it is a standard color an
asterisk will follow the main wire color. If the tracer
Fig. 2 Secondary Ignition Wiring 2.2L Turbo III
Fig. 3 Distributor Cap 3.0L V6 Engine
Fig. 1 Secondary Ignition Wiring 2.2L and 2.5L Engine
Fig. 4 Secondary Ignition Wiring 3.0L V6 Engine
Fig. 5 Secondary Ignition Wiring 3.3L and 3.8L V6 Engine
8W - 2 GENERAL INFORMATION Ä

WIRING AND COMPONENT IDENTIFICATION
CONTENTS
page page
AA BODY C, D, P ...................... 19
AC BODY C,D ......................... 37
AG BODY ............................. 61 AJ BODY
.............................. 77
AP BODY D, P ......................... 94
AY BODY-C ........................... 111
The wiring and components shown in this section
are divided into groups by vehicle line. When locat-
ing a specific harness routing or component, first
turn to the appropriate index, then look up the fig-
ure number that applies.Page numbers at the top of each page do not refer to figure numbers.
Throughout this section references may be made to
a particular vehicle by letter or number designation.
A chart showing the breakdown of these is shown in
the general information section.
AA BODY C, D, P
Caption Fig.
Anti Lock Brake System Wiring .....................4
Body Left Side Wiring ...........................6
Body Right Side Wiring ..........................5
Deck Lid Wiring ..............................1
Door Wiring (Body Side) .........................7
Door Wiring (Front) ............................8
Door Wiring (Rear) ............................9
Engine Compartment Wiring ......................16
Engine Wiring 2.5L ............................19
Engine Wiring 2.5L Flex Fuel ......................20Caption Fig.
Engine Wiring 3.0L ............................21
Front End Lighting ............................22
Ground Strap Locations .........................15
Instrument Panel Wiring .................. .11, 12, 13
Rear End Wiring ..............................2
Steering Column Wiring .........................10
Transmission Wiring ...........................17
Transmission Wiring ETAX .......................18
Trunk Wiring ................................3
Underhood Lamp Wiring ........................14
Ä WIRING AND COMPONENT IDENTIFICATION 8W - 19

Fig. 16 Engine Compartment Wiring AA Body
8W - 30 WIRING AND COMPONENT IDENTIFICATION Ä

Fig. 19 Engine Wiring 2.5L EFI AA Body
Ä WIRING AND COMPONENT IDENTIFICATION 8W - 33

Fig. 20 Engine Wiring 2.5L Flex Fuel AA Body
8W - 34 WIRING AND COMPONENT IDENTIFICATION Ä