Dodge Dakota Sport 2001 Service Manual page 573

8R - 4 WIPERS/WASHERS
WIPERS/WASHERS (Continued)
diagnosis of the Central Timer Module (CTM). In
order to obtain conclusive testing of the CTM, the
Programmable Communications Interface (PCI) data
bus network and all of the electronic modules that
provide inputs to or receive outputs from the wiper
system components must be checked. The most reli-
able, efficient, and accurate means to diagnose the
CTM requires the use of a DRBIII scan tool. Refer
to the appropriate diagnostic information. The
DRBIII scan tool can provide confirmation that the
PCI data bus is functional, that all of the electronic
modules are sending and receiving the proper mes-
sages on the PCI data bus, and that the wiper relay
is being sent the proper hard wired outputs by the
CTM for it to perform its wiper system functions.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Check the fused ignition switch output (run-
acc) fuse (Fuse 5 - 20 ampere) in the Junction Block
(JB). If OK, go to Step 2. If not OK, repair the
shorted circuit or component as required and replace
the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run-acc) fuse (Fuse 5 - 20 ampere) in the JB.
If OK, go to Step 3. If not OK, repair the open fused
ignition switch output (run-acc) circuit between the
JB and the ignition switch as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the instrument panel wire harness con-
nector for the multi-function switch from the switch
connector receptacle. Reconnect the battery negative
cable. Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run-acc) circuit cavity of the instrument
panel wire harness connector for the multi-function
switch. If OK, go to Step 4. If not OK, repair the
open fused ignition switch output (run-acc) circuit
between the multi-function switch and the JB as
required.
(4) If the problem being diagnosed involves only
the intermittent wipe feature, go to Step 5. If the
problem being diagnosed involves all wiper modes, or
only the Low and/or High speed modes, go to Step 7.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the instrument panel wire harness con-
nector (Connector C1) for the CTM from the CTM
connector receptacle. Check for continuity between
the intermittent front wiper mode sense circuit cavi-
ties of the instrument panel wire harness connector
for the multi-function switch and the instrument
panel wire harness connector (Connector C1) for the
CTM. There should be continuity. If OK, go to Step 6.
If not OK, repair the open intermittent front wiper
mode sense circuit between the multi-function switch
and the CTM as required.
(6) Check for continuity between the intermittent
front wiper switch signal circuit cavities of the
instrument panel wire harness connector for the
multi-function switch and the instrument panel wire
harness connector (Connector C1) for the CTM. There
should be continuity. If OK, proceed to the diagnosis
for the wiper relay. (Refer to 8 - ELECTRICAL/WIP-
ERS/WASHERS/WIPER RELAY - DIAGNOSIS AND
TESTING). If not OK, repair the open intermittent
front wiper switch signal circuit between the multi-
function switch and the CTM as required.
(7) Check for continuity between the two front
wiper low speed circuit cavities of the instrument
panel wire harness connector for the multi-function
switch. There should be continuity. If OK, go to Step
8. If not OK, repair the open front wiper low speed
circuit between the two cavities of the instrument
panel wire harness connector for the multi-function
switch as required.
(8) Test the multi-function
(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR/MULTI-FUNCTION SWITCH - DIAG-
NOSIS AND TESTING). If the multi-function switch
tests OK, reconnect the instrument panel wire har-
ness connector for the multi-function switch to the
switch connector receptacle and go to Step 9. If not
OK, replace the faulty multi-function switch and test
the wiper system operation again. If still not OK, go
to Step 9.
(9) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Measure the resistance between the headlamp and
dash wire harness ground wire for the wiper motor
and a good ground. The meter should read zero
ohms. If OK, go to Step 10. If not OK, repair the
open ground circuit to ground (G113) as required.
(10) Disconnect the headlamp and dash wire har-
ness connector for the wiper module from the wiper
motor pigtail wire connector. Reconnect the battery
negative cable. Turn the ignition switch to the On
position. Place the multi-function switch in the posi-
AN
switch continuity.