ABS DODGE RAM 1999 Service Repair Manual

ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS,
replace CTM. If scan tool displays BUS SHORT TO 5 VOLTS, go to next
step.
8) Disconnect scan tool from DLC. Using external voltmeter,
measure voltage between ground and DLC connector terminal No. 3
(Violet/Brown wire). If voltage is more than 4 volts, repair
Violet/Brown wire for short to voltage. If voltage is 4 volts or less,
go to next step.
9) Measure voltage between ground and DLC connector terminal
No. 11 (White/Black wire). If voltage is more than 4 volts, repair
White/Black wire for short to voltage. If voltage is less than 4
volts, replace scan tool cable or scan tool as necessary.
10) Turn ignition off. Using external ohmmeter, measure
resistance between Powertrain Control Module (PCM) connector C3
terminal No. 30 (Violet/Brown wire) and connector C1 terminal No. 17
(Violet/Black wire). PCM is located at right inner fender. If
resistance is less than 800 ohms, repair short between Violet/Brown
wire and Violet/Black wire. If resistance is 800 ohms or more, go to
next step.
11) Measure resistance between PCM connector C3 terminal No.
28 (White/Black wire) and PCM connector C1 terminal No. 17
(Violet/Black wire). If resistance is less than 800 ohms, repair short\
between Violet/Black and White/Black wires of both connectors. See
wiring diagram for clarification. If resistance is 800 ohms or more,
replace PCM.
BUS SHORT TO BATTERY
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1 after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module
connector.
1) Turn ignition off. Disconnect Powertrain Control Module
(PCM). PCM is mounted in right side of firewall. Turn ignition on. If
scan tool does not display BUS SHORT TO BATTERY, go to step 10). If
scan tool displays BUS SHORT TO BATTERY, go to next step.
2) Turn ignition off. Disconnect instrument cluster. Turn
ignition on. If scan tool does not display BUS SHORT TO BATTERY,
replace instrument cluster. If scan tool displays BUS SHORT TO
BATTERY, go to next step.
3) Turn ignition off. Disconnect compass mini-trip computer.
Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY,
replace compass mini-trip computer. If scan tool displays BUS SHORT TO
BATTERY, go to next step.
4) Turn ignition off. Disconnect CCD radio. Turn ignition on.
If scan tool does not display BUS SHORT TO BATTERY, replace radio. If
scan tool displays BUS SHORT TO BATTERY, go to next step.
5) Turn ignition off and wait 2 minutes. Disconnect Air Bag
Control Module (ACM). ACM is located under center of instrument panel.\
Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY,
replace ACM. If scan tool displays BUS SHORT TO BATTERY, go to next
step.
6) Turn ignition off. Disconnect Central Timer Module (CTM).\
CTM is located under left side of instrument panel. Turn ignition on.
If scan tool does not display BUS SHORT TO BATTERY, replace CTM. If
scan tool displays BUS SHORT TO BATTERY, go to next step.
7) Turn ignition off. Disconnect anti-lock brake controller
module. Controller module is mounted to top of ABS hydraulic unit.
Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY,
replace anti-lock brake controller module. If scan tool displays BUS

SHORT TO BATTERY, go to next step.
8) Disconnect scan tool from DLC. Using external voltmeter,
measure voltage between ground and DLC connector terminal No. 3
(Violet/Brown wire). If voltage is more than .2 volt, repair
Violet/Brown wire for short to voltage. If voltage is .2 volt or less,
go to next step.
9) Measure voltage between ground and DLC connector terminal
No. 11 (White/Black wire). If voltage is more than .2 volt, repair
White/Black wire for short to voltage. If voltage is less than .2
volt, replace scan tool cable or scan tool as necessary.
10) Turn ignition off. Using external ohmmeter, measure
resistance between ground and Powertrain Control Module (PCM)
connector C1 terminal No. 31 (Black/Tan wire). PCM is located at right\
inner fender, at corner of firewall. If resistance is less than 10
ohms, go to next step. If resistance is 10 ohms or more, repair open
Black/Tan wire.
11) Measure resistance between ground and PCM connector C1
terminal No. 32 (Black/Tan wire). If resistance is less than 10 ohms,
replace PCM. If resistance is 5 ohms or more, repair open Black/Tan
wire.
BUS SHORT TO GROUND
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1 after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module
connector.
1) Turn ignition off. Disconnect Powertrain Control Module
(PCM). PCM is mounted in right side of firewall. Turn ignition on. If
scan tool does not display BUS SHORT TO GROUND, replace PCM. If scan
tool displays BUS SHORT TO GROUND, go to next step.
2) Turn ignition off. Disconnect anti-lock brake controller
module. Controller module is mounted to top of ABS hydraulic unit.
Turn ignition on. If scan tool does not display BUS SHORT TO GROUND,
replace anti-lock brake controller module. If scan tool displays BUS
SHORT TO GROUND, go to next step.
3) Turn ignition off. Disconnect instrument cluster. Turn
ignition on. If scan tool does not display BUS SHORT TO GROUND,
replace instrument cluster circuit board. If scan tool displays BUS
SHORT TO GROUND, go to next step.
4) Turn ignition off. Disconnect compass mini-trip computer.
Turn ignition on. If scan tool does not display BUS SHORT TO GROUND,
replace compass mini-trip computer. If scan tool displays BUS SHORT TO
GROUND, go to next step.
5) Turn ignition off. Disconnect CCD radio. Turn ignition on.
If scan tool does not display BUS SHORT TO GROUND, replace radio. If
scan tool displays BUS SHORT TO GROUND, go to next step.
6) Turn ignition off and wait 2 minutes. Disconnect Air Bag
Control Module (ACM). ACM is located under center of instrument panel.\
Turn ignition on. If scan tool does not display BUS SHORT TO GROUND,
replace ACM. If scan tool displays BUS SHORT TO GROUND, go to next
step.
7) Turn ignition off. Disconnect Central Timer Module (CTM).\
CTM is located under left side of instrument panel. Turn ignition on.
If scan tool does not display BUS SHORT TO GROUND, replace CTM. If
scan tool displays BUS SHORT TO GROUND, go to next step.
8) Disconnect scan tool from DLC. Using external ohmmeter,
measure resistance between ground and DLC connector terminal No. 3
(Violet/Brown wire). If resistance is less than 700 ohms, repair
Violet/Brown wire for short to ground. If resistance is 700 ohms or

bolster. Remove CTM from bracket on inboard side of instrument panel
steering column opening. Disconnect harness connectors. To install,
reverse removal procedure.
INTERMITTENT WIPER RELAY
Removal & Installation
Intermittent wiper relay is located in Power Distribution
Center (PDC) in engine compartment. Remove cover and remove relay. To
install, reverse removal procedures
WIPER ARMS
Removal & Installation
Open hood. Lift wiper and slide latch to hold wiper off of
windshield. With a rocking motion, remove wiper arm. To install,
ensure wiper motor is in park position. Slide wiper arm on shaft.
Align wiper arms. See WIPER BLADES under ADJUSTMENTS.
WIPER MOTOR
NOTE: Wiper linkage and motor module is replaced as a unit.
Removal & Installation
1) Disconnect negative battery cable. Remove wiper arms. See
WIPER ARMS. Remove weatherstrip along front edge of cowl. Release
plastic anchor screws. Lift cowl grille from vehicle. Remove washer
hose from "Y" fitting. Set grille aside.
2) Remove wiper linkage mounting bolts. Turn linkage over and
disconnect harness connector from wiper motor. Remove wiper linkage
and motor module. To install, reverse removal procedure. Align wiper
arms. See WIPER BLADES under ADJUSTMENTS.
WIPER/WASHER SWITCH
NOTE: Wiper/washer switch is part of multifunction steering column
switch. If wiper/washer switch fails, entire multifunction
switch must be replaced.
Removal & Installation
1) Disconnect negative battery cable. Remove tilt lever (if
equipped). Remove steering column upper and lower covers to access
switch connector. Remove switch connector. Remove multifunction switch
tamperproof screws.
2) Gently pull switch away from column and loosen connector
screw (screw remains in connector). Remove switch. To install, reverse\
removal procedure. Tighten screws and nuts to specification. See
TORQUE SPECIFICATIONS. Ensure switch is functioning properly.
WASHER RESERVOIR
Removal & Installation
Disconnect negative battery cable. Drain cooling system.
Disconnect upper radiator hose from radiator. Disconnect harness
connectors from washer pump and washer fluid level sensor. Remove
washer supply hose from washer pump and drain washer fluid. While
pulling reservoir away from fan shroud, lift reservoir upward to
disengage mounting tabs from fan shroud. Remove washer reservoir. To
install, reverse removal procedure.
WASHER MOTOR
Removal & Installation