display DODGE RAM 1999 Service Workshop Manual

NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
If temperature reading is off by more than 5
F, ambient
temperature sensor is defective. Replace ambient temperature sensor.
Ambient temperature sensor is located on left radiator saddle.
REPAIRING "OC" IN CMTC DISPLAY
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Drive
vehicle at least 3 miles (greater than 25 MPH) to update CMTC\
and perform VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting any module connector.
1) Disconnect ambient temperature sensor connector. Sensor is
located on left radiator saddle. Connect jumper wire between sensor
connector terminals. Turn ignition on. Observe CMTC display. If CMTC
displays SC, replace ambient temperature sensor. If CMTC does not
display SC, go to next step.
2) Turn ignition off. Disconnect jumper wire. Disconnect CMTC
module connector. Connect a jumper wire between ground and ambient
temperature sensor harness connector Violet/Light Green wire. If CMTC
displays SC, repair open Black/Violet wire between ambient temperature
sensor harness connector and ground. If CMTC does not display SC, go
to next step.
3) Connect a backprobe jumper wire between ground and CMTC
harness connector terminal No. 3 (Violet/Light Green wire). If CMTC
displays SC, repair open Violet/Light Green wire between ambient
temperature sensor harness connector and CMTC connector. If CMTC does
not display SC, replace CMTC module.
REPAIRING "SC" IN CMTC DISPLAY
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting any module connector.
1) Turn ignition off. Disconnect CMTC connector. Using an
external ohmmeter, measure resistance between CMTC harness connector
terminal No. 3 (Violet/Light Green wire) and terminal No. 7
(Black/Light Green wire). If resistance is less than 5 ohms, repair
Violet/Light Green wire between CMTC module and ambient temperature
sensor for short to ground. If resistance is 5 ohms or more, go to
next step.
2) Measure resistance between CMTC harness connector terminal
No. 9 (Black/Light Blue wire) and terminal No. 3 (Violet/Light Green
wire). If resistance is less than 1000 ohms, repair Violet/Light Green
wire for short to Black/Light Blue wire. If resistance is 1000 ohms or
more, go to next step.
3) Disconnect ambient temperature sensor connector. Sensor is
located on left radiator saddle. Observe CMTC display. If CMTC
displays OC, replace ambient temperature sensor. If CMTC does not
display OC, replace CMTC module.

POWER DOOR LOCK SYSTEM
DOOR LOCK SWITCH FAILURE (PDL)
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Clear trouble codes as needed. See BODY CONTROL COMPUTER -
INTRODUCTION article. Using scan tool, read I/O's door lock switch
status. If scan tool displays PRESSED, go to next step. If scan tool
does not display PRESSED, system is currently functioning properly.
2) Disconnect left door lock switch connector. If scan tool
displays PRESSED, go to next step. If scan tool does not display
PRESSED, replace left door lock switch.
3) Disconnect right door lock switch connector. If scan tool
displays PRESSED, go to next step. If scan tool does not display
PRESSED, replace right door lock switch.
4) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external voltmeter, measure voltage between ground and CTM
18-pin connector C2 terminal No. 4 (Orange/Dark Green wire). If
voltage is more than 1.5 volts, repair short to voltage in Orange/Dark
Green wire. If voltage is 1.5 volts or less, replace CTM.
DOOR UNLOCK SWITCH FAILURE (PDL)
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Clear trouble codes as needed. See BODY CONTROL COMPUTER -
INTRODUCTION article. Using scan tool, read I/O's door unlock switch
status. If scan tool displays PRESSED, go to next step. If scan tool
does not display PRESSED, system is currently functioning properly.
2) Disconnect left door lock switch connector. If scan tool
displays PRESSED, go to next step. If scan tool does not display
PRESSED, replace left door lock switch.
3) Disconnect right door lock switch connector. If scan tool
displays PRESSED, go to next step. If scan tool does not display
PRESSED, replace right door lock switch.
4) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external voltmeter, measure voltage between ground and CTM
18-pin connector C2 terminal No. 13 (Pink/Dark Green wire). If voltage\
is more than 1.5 volts, repair short to voltage in Pink/Dark Green
wire. If voltage is 1.5 volts or less, replace CTM.
AUTOMATIC (ROLLING) DOOR LOCKS INOPERATIVE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
1) Using scan tool select SYSTEM MONITORS, then CCD BUS TEST.
If scan tool displays BUS OPERATIONAL, go to next step. If scan tool

does not display BUS OPERATIONAL, go to appropriate VEHICLE
COMMUNICATIONS article.
2) Using scan tool select BODY COMPUTER. If scan tool
displays NO RESPONSE, go to appropriate VEHICLE COMMUNICATIONS
article. If scan tool does not displays NO RESPONSE, go to next step.
3) This test is only for vehicles equipped with speed
sensitive door locks. With doors closed and unlocked drive vehicle
faster than 15 MPH. If doors lock, system is currently functioning
properly. If doors do not lock, using scan tool select ROLLING LOCKS.
Retest system.
DOORS LOCK WITH KEY IN IGNITION & LEFT DOOR OPEN
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool select SYSTEM MONITORS, then CCD BUS TEST.
If scan tool displays BUS OPERATIONAL, go to next step. If scan tool
does not display BUS OPERATIONAL, go to appropriate VEHICLE
COMMUNICATIONS article.
2) Using scan tool select BODY COMPUTER. If scan tool
displays NO RESPONSE, go to appropriate VEHICLE COMMUNICATIONS
article. If scan tool does not display NO RESPONSE, go to next step.
3) Place key in ignition. Open driver's door. Lock doors from
interior lock switch. If doors locked, go to next step. If doors did
not lock, system is currently functioning correctly.
4) Using scan tool, read left door ajar status. Open and
close left door. If door ajar state changed from OPEN to CLOSED, go to
next step. If door ajar state did not change from OPEN to CLOSED, go
to OPEN LEFT DOOR AJAR CIRCUIT under DOOR AJAR SYSTEM.
5) Ensure driver's door is open. Read key-in ignition status.
If scan tool shows KEY-IN, replace Central Timer Module (CTM). CTM is
located behind right kick panel. If scan tool does not show KEY-IN, go
to next step.
6) Gain access to CTM connector C1. Do not disconnect
connector. Using an external voltmeter, measure voltage between ground
and CTM 14-pin connector C1 terminal No. 9 (Light Blue wire). If
voltage is more than 1.5 volts, repair open Light Blue wire. If
voltage is 1.5 volts or less, go to next step.
7) Turn ignition off and remove key. Measure voltage between
ground and CTM 14-pin connector C1 terminal No. 9 (Light Blue wire).
If voltage is less than 1.5 volts, replace CTM. If voltage is 1.5
volts or more, replace ignition switch.
ONE OR ALL DOORS FAILING TO LOCK FROM ONE SWITCH (ONE OR ALL
DOORS FAILING TO UNLOCK FROM ONE SWITCH)
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool select SYSTEM MONITORS, then CCD BUS TEST.
If scan tool displays BUS OPERATIONAL, go to next step. If scan tool
does not display BUS OPERATIONAL, go to appropriate VEHICLE
COMMUNICATIONS article.
2) Using scan tool select BODY COMPUTER. If scan tool

displays NO RESPONSE, go to appropriate VEHICLE COMMUNICATIONS
article. If scan tool does not display NO RESPONSE, go to next step.
3) Read DTCs. If no DTCs are displayed, go to next step. If
DOOR LOCK SWITCH FAILURE is displayed, go to DOOR LOCK SWITCH FAILURE
(PDL). If DOOR UNLOCK SWITCH FAILURE is displayed, go to DOOR UNLOCK
SWITCH FAILURE (PDL).
4) Lower both front windows. Remove key from ignition switch
and close all doors. Lock and unlock doors from all switches. If all
doors lock and unlock properly, system is currently functioning
properly. If one or all locks fail to lock from one switch, go to next
step. If one or all locks fail to unlock from one switch, go to step
12).
5) Using scan tool, read I/O's door lock switch status. Press
lock button on inoperative door. If scan tool does not display LOCK SW
PRESSED while lock switch is pressed on inoperative door, go to step
9). If scan tool displays LOCK SW PRESSED while lock switch is pressed
on inoperative door, go to next step.
6) Access door lock actuator inside inoperative door.
Disconnect door lock actuator connector. Remove key from ignition and
roll windows down. Connect test light between door lock actuator
connector terminals. If test light illuminates while door lock switch
is pressed, replace door lock actuator. If test light does not
illuminate while door lock switch is pressed, go to next step.
7) Connect test light to ground and probe Orange/Black wire
of door lock actuator connector. If test light illuminates while door
lock switch is pressed, repair open Orange/Black wire between door
lock actuator and Central Timer Module (CTM). CTM is located behind
right kick panel. If test light does not illuminate while door lock
switch is pressed, go to next step.
8) Access CTM 18-pin connector C2. Remove connector cover. Do
not disconnect connector. Using an external voltmeter, measure voltage
between ground and CTM 18-pin connector C2 terminal No. 1
(Orange/Black wire). If voltage is more than 9.5 volts while door lock\
switch is pressed, repair open Orange/Black wire. If voltage is 9.5
volts or less while door lock switch is pressed, replace CTM.
9) Disconnect inoperative lock switch connector. Using an
external voltmeter, measure voltage between ground and Red wire of
door lock switch connector. If voltage is more than 9.5 volts, go to
next step. If voltage is 9.5 volts or less, repair open Red wire
between door lock switch connector and voltage source.
10) Reconnect door lock switch connector. Measure voltage
between ground and backprobe Orange/Violet wire of door lock switch
connector. If voltage is more than 9.5 volts while pressing lock
switch, go to next step. If voltage is 9.5 volts or less while
pressing lock switch, replace door lock switch.
11) Access CTM 18-pin connector C2. Remove connector cover.
Do not disconnect connector. Using an external voltmeter, measure
voltage between ground and CTM 18-pin connector C2 terminal No. 4
(Orange/Dark Green wire). If voltage is more than 9.5 volts while
pressing lock switch, replace CTM. If voltage is 9.5 volts or less
while pressing lock switch, repair open Orange/Dark Green wire between
CTM and door lock switch.
12) Using scan tool, read I/O's door unlock switch status. If
scan tool does not display UNLOCK SW PRESSED while unlock switch is
pressed on inoperative door, go to step 16). If scan tool displays
UNLOCK SW PRESSED while unlock switch is pressed on inoperative door,
go to next step.
13) Access door lock actuator inside inoperative door.
Disconnect door lock actuator connector. Remove key from ignition and
roll windows down. Connect test light between door lock actuator
connector terminals. If test light illuminates while door unlock
switch is pressed, replace door lock actuator. If test light does not
illuminate while door unlock switch is pressed, go to next step.

14) Connect test light to ground and probe Orange/Black wire
of door lock actuator connector. If test light illuminates while door
unlock switch is pressed, repair open Orange/Black wire between door
lock actuator and Central Timer Module (CTM). CTM is located behind
right kick panel. If test light does not illuminate while door unlock
switch is pressed, go to next step.
15) Access CTM 18-pin connector C2. Remove connector cover.
Do not disconnect connector. Using an external voltmeter, measure
voltage between ground and CTM 18-pin connector C2 terminal No. 9
(Pink/Black wire). If voltage is more than 9.5 volts while door unlock\
switch is pressed, repair open Pink/Black wire. If voltage is 9.5
volts or less while door unlock switch is pressed, replace CTM.
16) Disconnect inoperative lock switch connector. Using an
external voltmeter, measure voltage between ground and Red wire of
door lock switch connector. If voltage is more than 9.5 volts, repair
open Red wire between door lock switch connector and voltage source.
If voltage is 9.5 volts or less, go to next step.
17) Reconnect door lock switch connector. Measure voltage
between ground and backprobe Pink/Violet wire of door lock switch
connector. If voltage is more than 9.5 volts, go to next step. If
voltage is 9.5 volts or less, replace door lock switch.
18) Access CTM 18-pin connector "B". Remove connector cover.
Do not disconnect connector. Using an external voltmeter, measure
voltage between ground and CTM 18-pin connector "B" terminal No. 13
(Pink/Dark Green wire). If voltage is more than 9.5 volts, replace
CTM. If voltage is 9.5 volts or less, repair open Pink/Dark Green wire
between CTM and door lock switch.
REMOTE KEYLESS ENTRY PROBLEM
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool select SYSTEM MONITORS, then CCD BUS TEST.
If scan tool displays BUS OPERATIONAL, go to next step. If scan tool
does not display BUS OPERATIONAL, go to appropriate VEHICLE
COMMUNICATIONS article.
2) Using scan tool select BODY COMPUTER. If scan tool
displays NO RESPONSE, go to appropriate VEHICLE COMMUNICATIONS
article. If scan tool does not display NO RESPONSE, go to next step.
3) Operate door locks with Remote Keyless Entry (RKE)
transmitter. If doors locked when transmitter was actuated, system is
currently functioning properly. If doors do not lock when transmitter
was actuated, go to next step.
4) Ensure transmitter battery voltage is 3.2 volts. Turn
ignition on. Place transmission in park and disarm anti-theft system.
Using scan tool, select MISCELLANEOUS, then PROGRAM RKE. If BCM IS IN
PROGRAMMING MODE does not appear, exit and select PROGRAM RKE again.
Press any transmitter button. A single chime will announce RKE module
accepted transmission. Repeat procedure for all transmitters used with
vehicle. Operate door locks from reprogrammed transmitter. If door
locks operate properly, system has been repaired. If door locks do not
operate properly, go to next step.
5) Using scan tool, reprogram a known good transmitter:
Operate door locks with reprogrammed transmitter. If doors locked
properly, replace transmitter. If doors did not lock properly, replace
CTM.

VEHICLE THEFT/SECURITY SYSTEM
DOOR DISARM SWITCH FAILURE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool, read VTSS inputs/outputs information. If
scan tool displays door disarm switch state OPEN, system is currently
functioning properly. If scan tool does not display door disarm switch
state OPEN, go to next step.
2) Disconnect left door disarm switch. If scan tool displays
door disarm switch state OPEN, replace left door disarm switch. If
scan tool does not display door disarm switch state OPEN, go to next
step.
3) Disconnect right door disarm switch. If scan tool displays
door disarm switch state OPEN, replace left door disarm switch. If
scan tool does not display door disarm switch state OPEN, go to next
step.
4) Access Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external ohmmeter, measure resistance between ground and CTM
18-pin connector C2 terminal No. 10 (Light Green/Orange wire). If
resistance is less than 1000 ohms, repair short to ground in Light
Green/Orange wire. If resistance is 1000 ohms or more, replace CTM.
DOOR LOCK SWITCH FAILURE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Clear trouble codes as needed. See BODY CONTROL COMPUTER -
INTRODUCTION article. Using scan tool, read I/O's door lock switch
status. If scan tool displays RELEASED, system is currently
functioning properly. If scan tool does not display RELEASED, go to
next step.
2) Disconnect left door lock switch connector. If scan tool
displays RELEASED, replace left door lock switch. If scan tool does
not display RELEASED, go to next step.
3) Disconnect right door lock switch connector. If scan tool
displays RELEASED, replace right door lock switch. If scan tool does
not display RELEASED, go to next step.
4) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external voltmeter, measure voltage between ground and CTM
18-pin connector C2 terminal No. 13 (Pink/Dark Green wire). If voltage\
is more than 1.5 volts, repair short to voltage in Pink/Dark Green
wire between CTM and door lock switch. If voltage is 1.5 volts or
less, replace CTM.
DOOR UNLOCK SWITCH FAILURE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform

VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Clear trouble codes as needed. See BODY CONTROL COMPUTER -
INTRODUCTION article. Using scan tool, read I/O's door unlock switch
status. If scan tool displays RELEASED, system is currently
functioning properly. If scan tool does not display RELEASED, go to
next step.
2) Disconnect left door lock switch connector. If scan tool
displays RELEASED, replace left door lock switch. If scan tool does
not display RELEASED, go to next step.
3) Disconnect right door lock switch connector. If scan tool
displays RELEASED, replace right door lock switch. If scan tool does
not display RELEASED, go to next step.
4) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external voltmeter, measure voltage between ground and CTM
18-pin connector C2 terminal No. 4 (Orange/Dark Green wire). If
voltage is more than 1.5 volts, repair short to voltage in Orange/Dark
Green wire between CTM and door lock switch. If voltage is 1.5 volts
or less, replace CTM.
IDENTIFYING VTSS PROBLEMS
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool, select BODY SYSTEM then VTSS and read
Central Timer Module (CTM) DTCs. If any VTSS DTCs are displayed,
perform appropriate procedure. See VTSS DTC table. If no VTSS DTCs are
displayed, go to next step.
VTSS DTC









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DTC Message Perform
DOOR DISARM SWITCH FAILURE .............. DOOR DISARM SWITCH FAILURE
DOOR LOCK SWITCH FAILURE .................. DOOR LOCK SWITCH FAILURE
DOOR UNLOCK SWITCH FAILURE .............. DOOR UNLOCK SWITCH FAILURE
EEPROM CHECKSUM FAILURE ................................ Replace CTM
INTERNAL ROM TEST FAILURE .............................. Replace CTM









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2) Select VTSS then MONITORS. If scan tool displays, OK TO
RUN, NOT OK TO ARM, PCM has not recorded more than 20 starts. Start
engine 20 times and retest. If message does not change to OK TO ARM,
replace PCM. If scan tool displays NO RESPONSE TO PCM, see appropriate
VEHICLE COMMUNICATIONS article. If scan tool does not display OK TO
RUN, NOT OK TO ARM or NO RESPONSE TO PCM, go to next step.
3) Using scan tool, actuate horn, headlights and VTSS light
to flash. If horn does not sound, go to next step. If headlights do
not flash, go to step 6). If VTSS light does not flash, go to step 9).\
If all function properly, go to step 12).
4) Press horn button. If horn does not sound, go to
appropriate STEERING COLUMN SWITCHES article. If horn sounds, go to
next step.
5) Locate Central Timer Module (CTM). CTM is located behind

right kick panel. Disconnect CTM 18-pin connector C2. Turn ignition
on. Using an external voltmeter, measure voltage between ground and
CTM 18-pin connector C2 terminal No. 18 (Black/Red wire). If voltage
is more than 9.5 volts, replace CTM. If voltage is 9.5 volts or less,
repair open in Black/Red wire between CTM and horn relay.
6) Remove security relay from Power Distribution Center
(PDC). Turn ignition on. Connect a test light between battery source
and headlight relay connector terminal No. 85 (Red/Dark Blue wire).
Using scan tool, actuate relay. If test light illuminates, replace
security relay. If test light does not illuminate, go to next step.
7) Using an external voltmeter, measure voltage between
battery voltage and security relay connector terminal No. 86
(Red/Orange wire). If voltage is more than 9.5 volts, go to next step.\
If voltage is 9.5 volts or less, repair open in Red/Orange wire
between battery source and security relay.
8) Reinstall security relay. Locate Central Timer Module
(CTM). CTM is located behind right kick panel. Disconnect CTM 18-pin
connector C2. Using an external voltmeter, measure voltage between
ground and CTM 18-pin connector C2 terminal No. 6 (Red/Dark Blue
wire). If voltage is more than 9.5 volts, replace CTM. If voltage is
9.5 volts or less, repair open in Red/Dark Blue wire between CTM and
security relay.
9) Disconnect overhead console 12-pin connector. Using an
external voltmeter, measure voltage between battery and overhead
console 12-pin connector terminal No. 11 (Black wire). Using scan
tool, actuate VTSS indicator light. If voltage is about 10 volts,
replace overhead console. If voltage is not about 10 volts, go to next
step.
10) Measure voltage between ground and overhead console 12-
pin connector terminal No. 5 (Pink wire). Turn ignition on. If voltage\
is more than 10 volts, go to next step. If voltage is 10 volts or
less, repair open Pink wire.
11) Locate Central Timer Module (CTM). CTM is located behind\
right kick panel. Disconnect CTM 18-pin connector C2. Turn ignition
on. Using an external ohmmeter, measure resistance between ground and
CTM 18-pin connector C2 terminal No. 8 (Black wire). If resistance is
5 ohms or more, replace CTM. If resistance is less than 5 ohms, repair
open Black wire between CTM and VTSS indicator light.
12) Using scan tool, place VTSS in diagnostic mode and follow
directions on screen. If TURN KEY TO ACC POSITION is not displayed, go
to step 24). If NO RESPONSE after turning key to accessory position or
TURN KEY TO ACC POSITION is displayed longer than 15 seconds, go to
next step. If neither response is received, go to step 14).
13) Locate Central Timer Module (CTM). CTM is located behind\
right kick panel. Gain access to CTM 18-pin connector C2. Ensure key
is in accessory position. Using an external voltmeter, measure voltage
between ground and backprobe of CTM 18-pin connector C2 terminal No. 5
(Dark Blue/White wire). If voltage is more than 10 volts, replace CTM.\
If voltage is 10 volts or less, repair open Dark Blue/White wire
between CTM and junction block.
14) Remove key from ignition. Wait 2 seconds after performing
each of the following actions. Open, then close both door. Operate
power door lock switch to lock, then unlock position. Rotate key both
directions in both doors. Ensure each operation is successful. If any
operation is unsuccessful, see VTSS SYMPTOM DIRECTORY table for repair
of failed operation. If all operations are successful, go to step 22).
VTSS SYMPTOM DIRECTORY









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Problem Circuit Go To
Driver's Door Open Or Close ............................... Step 15)

Passenger's Door Open Or Close ............................ Step 16)
Driver's Door Lock Switch ................. ONE OR ALL DOORS FAILING
TO LOCK FROM ONE SWITCH
Passenger's Door Lock Switch .............. ONE OR ALL DOORS FAILING
TO LOCK FROM ONE SWITCH
Driver's Key Cylinder ..................................... Step 17)
Passenger's Key Cylinder .................................. Step 20)
Driver's Door Unlock Switch ............... ONE OR ALL DOORS FAILING
TO UNLOCK FROM ONE SWITCH
Passenger's Door Unlock Switch ............ ONE OR ALL DOORS FAILING
TO UNLOCK FROM ONE SWITCH









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15) Ensure driver's door is closed. Using scan tool, read
VTSS inputs/outputs door ajar status. If scan tool displays DR DOOR
AJAR SWITCH: CLOSED, go to SHORTED LEFT DOOR AJAR CIRCUIT under DOOR
AJAR SYSTEM. If scan tool does not display DR DOOR AJAR SWITCH:
CLOSED, go to OPEN LEFT DOOR AJAR CIRCUIT under DOOR AJAR SYSTEM.
16) Ensure passenger's door is closed. Using scan tool, read
VTSS inputs/outputs door ajar status. If scan tool displays DR DOOR
AJAR SWITCH: CLOSED, go to SHORTED RIGHT DOOR AJAR CIRCUIT under DOOR
AJAR SYSTEM. If scan tool does not display DR DOOR AJAR SWITCH:
CLOSED, go to OPEN RIGHT DOOR AJAR CIRCUIT under DOOR AJAR SYSTEM.
17) Using scan tool, monitor door disarm switch state.
Disconnect left door disarm switch. Connect jumper wire between left
door disarm switch connector terminals. If scan tool displays door
disarm switch state CLOSED, replace left door disarm switch. If scan
tool does not display door disarm switch state CLOSED, go to next
step.
18) Disconnect jumper wire. Connect jumper wire between
ground and left door disarm switch connector Light Green/Orange wire.
If scan tool displays door disarm switch state CLOSED, go to next
step. If scan tool does not display door disarm switch state CLOSED,
repair open left door disarm switch ground circuit (Black/Light Green
wire).
19) Access Central Timer Module (CTM). CTM is located behind\
right kick panel. Remove connector cover. Do not disconnect connector.
Connect a jumper between ground and backprobe CTM 18-pin connector C2
terminal No. 10 (Light Green/Orange wire). If scan tool displays door
disarm switch state CLOSED, repair open left door disarm switch sense
circuit (Light Green/Orange wire). If scan tool does not display door
disarm switch state CLOSED, replace CTM.
20) Using scan tool, monitor door disarm switch state.
Disconnect right door disarm switch. Connect jumper wire between right
door disarm switch connector terminals. If scan tool displays door
disarm switch state CLOSED, replace right door disarm switch. If scan
tool does not display door disarm switch state CLOSED, go to next
step.
21) Disconnect jumper wire. Connect jumper wire between
ground and right door disarm switch connector Light Green/Orange wire.
If scan tool displays door disarm switch state CLOSED, go to next
step. If scan tool does not display door disarm switch state CLOSED,
repair open right door disarm switch ground circuit (Black/Light Green
wire).
22) Access Central Timer Module (CTM). CTM is located behind\
right kick panel. Remove connector cover. Do not disconnect connector.
Connect a jumper between ground and backprobe CTM 18-pin connector C2
terminal No. 10 (Light Green/Orange wire). If scan tool displays door
disarm switch state CLOSED, repair open right door disarm switch sense
circuit (Light Green/Orange wire). If scan tool does not display door

disarm switch state CLOSED, replace CTM.
23) Turn ignition switch to START position. If horn does not
sound, go to next step. If horn sounds, go to step 24).
24) Locate Central Timer Module (CTM). CTM is located behind\
right kick panel. Disconnect CTM 14-pin connector C1. Using an
external voltmeter, measure voltage between ground and CTM 14-pin
connector C1 terminal No. 8 (Dark Blue/White wire). If voltage is more\
than 10 volts, replace CTM. If voltage is 10 volts or less, repair
open Dark Blue/White wire between CTM and RUN-ACC fuse in junction
block.
WINDSHIELD WIPER SYSTEM
WIPER PARK SWITCH FAILURE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
NOTE: It takes 8 seconds for wiper park switch failure DTC to set.
1) Using scan tool, clear DTCs. See appropriate SELF-
DIAGNOSTICS article. Operate wipers in low speed, then intermittent
mode. Reread DTCs. If WIPER PARK SWITCH FAILURE is displayed, go to
next step. If WIPER PARK SWITCH FAILURE is not displayed, system is
currently functioning properly.
2) Gain access to wiper motor connector. Using an external
voltmeter, measure voltage between ground and wiper motor terminal No.
2 (Dark Green wire). If voltage is more than 9 volts, go to next step.\
If voltage is 9 volts or less, replace wiper motor.
3) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Using an external voltmeter, measure
voltage between ground and backprobe of CTM 14-pin Green connector C1
terminal No. 11 (Dark Green wire). If voltage is 9 volts or less,
replace CTM. If voltage is more than 9 volts, repair short to voltage
in Dark Green wire between CTM and wiper relay or wiper motor.
INTERMITTENT WIPERS INOPERATIVE
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool select CENTRAL TIMER MODULE. If scan tool
displays NO RESPONSE, go to appropriate VEHICLE COMMUNICATIONS
article. If scan tool displays any CCD bus failure message, go to
SYMPTOM IDENTIFICATION. If scan tool does not display NO RESPONSE or
any CCD bus failure message, go to next step.
2) If problem is wipers parking in wrong position, go to next
step. If problem is not wipers parking in wrong position, go to step
5).
3) Gain access to wiper motor connector. Turn wipers on to
low speed. Using an external voltmeter, measure voltage between ground
and wiper motor switch terminal No. 2 (Dark Green wire). If voltage
does not cycle between zero and 12 volts, replace wiper motor. If
voltage cycles between zero and 12 volts, go to next step.